From oclc-fs@oclc.org Tue Apr 14 22:14:57 1998 Received: from aleve.media.mit.edu (aleve.media.mit.edu [18.85.2.171]) by ml.media.mit.edu (8.8.7/8.8.4) with ESMTP id WAA30582 for ; Tue, 14 Apr 1998 22:14:56 -0400 (EDT) Received: from oclc.org (fssun10.dev.oclc.org [132.174.19.11]) by aleve.media.mit.edu (8.8.7/ML970927) with SMTP id WAA18290 for ; Tue, 14 Apr 1998 22:14:55 -0400 (EDT) Received: from fscat.oclc.org (medusa.prod.oclc.org) by oclc.org (4.1/SMI-4.1) id AA05708; Tue, 14 Apr 98 22:14:23 EDT From: oclc-fs@oclc.org (First Search Mail) Message-Id: <9804150214.AA05708@oclc.org> To: Date: Tue, 14 Apr 1998 22:10:34 Subject: (1 of 1) Black holes and D-branes Status: O X-Status: ------------------------------------------------------------ PLEASE DO NOT REPLY OR SEND MESSAGES TO THIS EMAIL ADDRESS. ------------------------------------------------------------ NOTE: May or may not be relevent. SEARCH STRING: su:(entropy and (gravity or time or cosmology)) DATABASE: Inspec COPYRIGHT: Copyright 1998, FIZ Karlsruhe RECORD NO.: 5881164 INSPEC Abstract No: A9810-9760L-001 AUTHOR: Maldacena, J.M. CORP SOURCE: Dept. of Phys. & Astron., Rutgers Univ., Piscataway, NJ, USA TITLE: Black holes and D-branes SOURCE: Nucl. Phys. B, Proc. Suppl. (Netherlands), Nuclear Physics B, Proceedings Supplements, vol.62, no.1-3, p. 428-42 ISSN: 0920-5632 CODEN: NPBSE7 PLACE OF PUBL: Netherlands LANGUAGE: English PUBLISHER: Elsevier CONF TITLE: Fifth International Conference on Supersymmetries in Physics (SUSY 97) CONF LOCATION: Philadelphia, PA, USA; 27-31 May 1997 YEAR: March 1998 COPYRIGHT NO: 0920-5632/98/$19.00 TREATMENT: T Theoretical or Mathematical ABSTRACT: Black holes have an entropy proportional to the area of the horizon. The microscopic degrees of freedom that give rise to the entropy are not visible in the classical theory. String theory, a quantum theory of gravity, provides a microscopic quantum description of the thermodynamic properties of some extremal and near extremal charged black holes. The description uses properties of some string theory solitons called D-branes. In this description, Hawking radiation emerges as a simple perturbative process. The low energy dynamics of particle absorption and emission agrees in detail with the semiclassical analysis in the thermodynamic limit. We describe here these results in some detail (68 Refs.) DESCRIPTORS: black holes; entropy; extended objects; perturbation theory; quantum gravity; quasiparticles; solitons; space-time configurations; string theory; supersymmetry IDENTIFIERS: instantons; D-branes; entropy; horizon area; microscopic degrees of freedom; string theory; quantum gravity; microscopic quantum description; greybody factors; near extremal black holes; charged black holes; string theory solitons; Hawking radiation; perturbative process; low energy dynamics; particle absorption; particle emission; semiclassical analysis; thermodynamic limit; supersymmetry CLASS CODES: A9760L (Black holes); A0240 (Geometry, differential geometry, and topology); A0460 (Quantum theory of gravitation); A1110L (Nonlinear or nonlocal field theories and models); A1117 (Theories of strings and other extended objects); A1130P (Supersymmetry in particle physics); A9530C (Elementary particle and nuclear processes in astrophysics); A9530S (Relativity and gravitation in astrophysics) ------------------------------------------------------------ Thanks for using FirstSearch. 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Please contact your librarian with comments or concerns. ------------------------------------------------------------ From oclc-fs@oclc.org Tue Apr 14 22:17:22 1998 Received: from aleve.media.mit.edu (aleve.media.mit.edu [18.85.2.171]) by ml.media.mit.edu (8.8.7/8.8.4) with ESMTP id WAA30999 for ; Tue, 14 Apr 1998 22:17:21 -0400 (EDT) Received: from oclc.org (fssun10.dev.oclc.org [132.174.19.11]) by aleve.media.mit.edu (8.8.7/ML970927) with SMTP id WAA17040 for ; Tue, 14 Apr 1998 22:17:20 -0400 (EDT) Received: from fscat.oclc.org (medusa.prod.oclc.org) by oclc.org (4.1/SMI-4.1) id AA05797; Tue, 14 Apr 98 22:16:48 EDT From: oclc-fs@oclc.org (First Search Mail) Message-Id: <9804150216.AA05797@oclc.org> To: Date: Tue, 14 Apr 1998 22:12:59 Subject: (1 of 1) Hamiltonian thermodynamics of black holes in generic 2D Status: O X-Status: ------------------------------------------------------------ PLEASE DO NOT REPLY OR SEND MESSAGES TO THIS EMAIL ADDRESS. ------------------------------------------------------------ NOTE: Another marginal hit. SEARCH STRING: su:(entropy and (gravity or time or cosmology)) DATABASE: Inspec COPYRIGHT: Copyright 1998, IEE RECORD NO.: 5875585 INSPEC Abstract No: A9809-9760L-016 AUTHOR: Kunstatter, G.; Petryk, R.; Shelemy, S. CORP SOURCE: Dept. of Phys., Winnipeg Univ., Man., Canada TITLE: Hamiltonian thermodynamics of black holes in generic 2D dilaton gravity SOURCE: Physical Review D, vol.57, no.6, p. 3537-47 ISSN: 0556-2821 CODEN: PRVDAQ PLACE OF PUBL: USA LANGUAGE: English PUBLISHER: APS through AIP YEAR: 15 March 1998 COPYRIGHT NO: 0556-2821/98/57(6)/3537(11)/$15.00 TREATMENT: T Theoretical or Mathematical ABSTRACT: We consider the Hamiltonian mechanics and thermodynamics of an eternal black hole in a box of fixed radius and temperature in generic 2D dilaton gravity. Imposing boundary conditions analogous to those used by Louko and Whiting for spherically symmetric gravity, we find that the reduced Hamiltonian generically takes the form H(M, phi /sub +/)= sigma /sub 0/E(M, phi /sub +/)-(N/sub 0//2 pi )S(M), where E(M, phi /sub +/) is the quasilocal energy of a black hole of mass M inside a static box (surface of fixed dilaton field phi /sub +/) and S(M) is the associated classical thermodynamical entropy. sigma /sub 0/ and N/sub 0/ determine time evolution along the world line of the box and boosts at the bifurcation point, respectively. An ansatz for the quantum partition function is obtained by fixing sigma /sub 0/ and N/sub 0/ and then tracing the operator e/sup - beta H/ over mass eigenstates. We analyze this partition function in some detail both generically and for the class of dilaton gravity theories that is obtained by dimensional reduction of Einstein gravity in n+2 dimensions with S/sup n/ spherical symmetry (36 Refs.) DESCRIPTORS: bifurcation; black holes; quantum gravity IDENTIFIERS: Hamiltonian thermodynamics; black holes; generic 2D dilaton gravity; Hamiltonian mechanics; spherically symmetric gravity; quasilocal energy; fixed dilaton field; classical thermodynamical entropy; bifurcation point; quantum partition function; mass eigenstates; partition function; S/sup n/ spherical symmetry; Einstein gravity CLASS CODES: A9760L (Black holes); A0460 (Quantum theory of gravitation); A9530S (Relativity and gravitation in astrophysics) ------------------------------------------------------------ Thanks for using FirstSearch. This e-mail account is only for distribution of FirstSearch documents. Please contact your librarian with comments or concerns. ------------------------------------------------------------ From oclc-fs@oclc.org Tue Apr 14 22:18:31 1998 Received: from aleve.media.mit.edu (aleve.media.mit.edu [18.85.2.171]) by ml.media.mit.edu (8.8.7/8.8.4) with ESMTP id WAA30699 for ; Tue, 14 Apr 1998 22:18:30 -0400 (EDT) Received: from oclc.org (fssun10.dev.oclc.org [132.174.19.11]) by aleve.media.mit.edu (8.8.7/ML970927) with SMTP id WAA08044 for ; Tue, 14 Apr 1998 22:18:30 -0400 (EDT) Received: from fscat.oclc.org (medusa.prod.oclc.org) by oclc.org (4.1/SMI-4.1) id AA05863; Tue, 14 Apr 98 22:17:57 EDT From: oclc-fs@oclc.org (First Search Mail) Message-Id: <9804150217.AA05863@oclc.org> To: Date: Tue, 14 Apr 1998 22:14:09 Subject: (1 of 1) Upper bound for entropy in asymptotically de Sitter space- Status: O X-Status: ------------------------------------------------------------ PLEASE DO NOT REPLY OR SEND MESSAGES TO THIS EMAIL ADDRESS. ------------------------------------------------------------ NOTE: Another marginal hit. SEARCH STRING: su:(entropy and (gravity or time or cosmology)) DATABASE: Inspec COPYRIGHT: Copyright 1998, IEE RECORD NO.: 5875570 INSPEC Abstract No: A9809-9880-029 AUTHOR: Maeda, K.; Koike, T.; Narita, M.; Ishibashi, A. CORP SOURCE: Dept. of Phys., Tokyo Inst. of Technol., Japan TITLE: Upper bound for entropy in asymptotically de Sitter space- time SOURCE: Physical Review D, vol.57, no.6, p. 3503-8 ISSN: 0556-2821 CODEN: PRVDAQ PLACE OF PUBL: USA LANGUAGE: English PUBLISHER: APS through AIP YEAR: 15 March 1998 COPYRIGHT NO: 0556-2821/98/57(6)/3503(6)/$15.00 TREATMENT: T Theoretical or Mathematical ABSTRACT: We investigate the nature of asymptotically de Sitter space times containing a black hole. We show that if the matter fields satisfy the dominant energy condition and cosmic censorship holds in the considered space time, the area of the cosmological event horizon for an observer approaching a future timelike infinity does not decrease; i.e., the second law is satisfied. We also show under the same conditions that the total area of the black hole and the cosmological event horizon, a quarter of which is the total Bekenstein- Hawking entropy, is less than 12 pi / Lambda , where Lambda is the cosmological constant. The physical implications are also discussed (18 Refs.) DESCRIPTORS: black holes; cosmology; entropy; general relativity; gravitation; space-time configurations IDENTIFIERS: entropy; asymptotically de Sitter space-time; black hole; matter fields; dominant energy condition; cosmic censorship; cosmological event horizon; future timelike infinity; total Bekenstein-Hawking entropy; cosmological constant CLASS CODES: A9880D (Theoretical cosmology); A9760L (Black holes); A9530S (Relativity and gravitation in astrophysics); A0240 (Geometry, differential geometry, and topology); A0420C (Fundamental problems and general formalism in general relativity) ------------------------------------------------------------ Thanks for using FirstSearch. 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Please contact your librarian with comments or concerns. ------------------------------------------------------------ From oclc-fs@oclc.org Tue Apr 14 22:22:08 1998 Received: from aleve.media.mit.edu (aleve.media.mit.edu [18.85.2.171]) by ml.media.mit.edu (8.8.7/8.8.4) with ESMTP id WAA31394 for ; Tue, 14 Apr 1998 22:22:07 -0400 (EDT) Received: from oclc.org (fssun10.dev.oclc.org [132.174.19.11]) by aleve.media.mit.edu (8.8.7/ML970927) with SMTP id WAA20322 for ; Tue, 14 Apr 1998 22:22:07 -0400 (EDT) Received: from fscat.oclc.org (medusa.prod.oclc.org) by oclc.org (4.1/SMI-4.1) id AA06140; Tue, 14 Apr 98 22:22:01 EDT From: oclc-fs@oclc.org (First Search Mail) Message-Id: <9804150222.AA06140@oclc.org> To: Date: Tue, 14 Apr 1998 22:18:13 Subject: (1 of 1) Boundary states and black hole entropy Status: O X-Status: ------------------------------------------------------------ PLEASE DO NOT REPLY OR SEND MESSAGES TO THIS EMAIL ADDRESS. ------------------------------------------------------------ NOTE: This sounds useful. SEARCH STRING: su:(entropy and gravity) DATABASE: Inspec COPYRIGHT: Copyright 1998, IEE RECORD NO.: 5841029 INSPEC Abstract No: A9807-9760L-012 AUTHOR: Brown, J.D. CORP SOURCE: Dept. of Phys., North Carolina State Univ., Raleigh, NC, USA TITLE: Boundary states and black hole entropy SOURCE: Physical Review D, vol.57, no.4, p. 2624-7 ISSN: 0556-2821 CODEN: PRVDAQ PLACE OF PUBL: USA LANGUAGE: English PUBLISHER: APS through AIP YEAR: 15 Feb. 1998 COPYRIGHT NO: 0556-2821/0556-2821/98/57(4)/2624(4)/$10.00 TREATMENT: T Theoretical or Mathematical ABSTRACT: A formal derivation of black hole entropy is given as a sum over boundary states. The boundary states are labeled by energy and momentum surface densities, and parametrized by the boundary metric. The sum over state labels is expressed as a functional integral with measure determined by the density of states. The sum over metrics is expressed as a functional integral with measure determined by the universal expression for the inverse temperature gradient at the horizon. The analysis applies to any stationary, nonextreme black hole in any theory of gravitational and matter fields (10 Refs.) DESCRIPTORS: black holes; entropy; integration; quantum gravity IDENTIFIERS: boundary states; black hole entropy; boundary metric; functional integral; universal expression; inverse temperature gradient; stationary nonextreme black hole; gravitational fields; matter fields; quantum gravity CLASS CODES: A9760L (Black holes); A0440 (Continuous media; electromagnetic and other mixed gravitational systems); A0460 (Quantum theory of gravitation); A0230 (Function theory, analysis); A9530S (Relativity and gravitation in astrophysics) ------------------------------------------------------------ Thanks for using FirstSearch. This e-mail account is only for distribution of FirstSearch documents. Please contact your librarian with comments or concerns. ------------------------------------------------------------ From oclc-fs@oclc.org Tue Apr 14 22:26:22 1998 Received: from aleve.media.mit.edu (aleve.media.mit.edu [18.85.2.171]) by ml.media.mit.edu (8.8.7/8.8.4) with ESMTP id WAA31843 for ; Tue, 14 Apr 1998 22:26:22 -0400 (EDT) Received: from oclc.org (fssun10.dev.oclc.org [132.174.19.11]) by aleve.media.mit.edu (8.8.7/ML970927) with SMTP id WAA06157 for ; Tue, 14 Apr 1998 22:26:21 -0400 (EDT) Received: from fscat.oclc.org (medusa.prod.oclc.org) by oclc.org (4.1/SMI-4.1) id AA06423; Tue, 14 Apr 98 22:25:49 EDT From: oclc-fs@oclc.org (First Search Mail) Message-Id: <9804150225.AA06423@oclc.org> To: Date: Tue, 14 Apr 1998 22:22:00 Subject: (1 of 1) Fisher's arrow of "time" in cosmological coherent phase Status: O X-Status: ------------------------------------------------------------ PLEASE DO NOT REPLY OR SEND MESSAGES TO THIS EMAIL ADDRESS. ------------------------------------------------------------ NOTE: Middling probability. SEARCH STRING: su:(entropy and time and space) DATABASE: Inspec COPYRIGHT: Copyright 1998, IEE RECORD NO.: 5840128 INSPEC Abstract No: A9807-9880-001 AUTHOR: Frieden, B.R.; Rosu, H.C. CORP SOURCE: Opt. Sci. Center, Arizona Univ., Tucson, AZ, USA TITLE: Fisher's arrow of "time" in cosmological coherent phase space SOURCE: Modern Physics Letters A, vol.13, no.1, p. 39-46 ISSN: 0217-7323 CODEN: MPLAEQ PLACE OF PUBL: Singapore LANGUAGE: English PUBLISHER: World Scientific YEAR: 10 Jan. 1998 TREATMENT: T Theoretical or Mathematical ABSTRACT: Fisher's arrow of "time" in a cosmological phase space defined as in quantum optics (i.e. whose points are coherent states) is introduced as follows. Assuming that the phase space evolution of the universe starts from an initial squeezed cosmological state towards a final thermal one, a Fokker-Planck equation for the time-dependent, cosmological Q phase space probability distribution can be written down. Next, using some recent results in the literature, we derive an information arrow of time for the Fisher phase space cosmological entropy based on the Q-function. We also mention the application of Fisher's arrow of time to stochastic inflation models (32 Refs.) DESCRIPTORS: cosmology; Fokker-Planck equation; probability IDENTIFIERS: arrow of time; cosmological coherent phase space; quantum optics; coherent states; phase space evolution; initial squeezed cosmological state; Fokker-Planck equation; time- dependent cosmological Q phase space probability distribution; Fisher phase space cosmological entropy; Q- function; stochastic inflation models CLASS CODES: A9880D (Theoretical cosmology); A0250 (Probability theory, stochastic processes, and statistics); A0230 (Function theory, analysis) ------------------------------------------------------------ Thanks for using FirstSearch. This e-mail account is only for distribution of FirstSearch documents. Please contact your librarian with comments or concerns. ------------------------------------------------------------ From oclc-fs@oclc.org Tue Apr 14 22:28:48 1998 Received: from aleve.media.mit.edu (aleve.media.mit.edu [18.85.2.171]) by ml.media.mit.edu (8.8.7/8.8.4) with ESMTP id WAA31308 for ; Tue, 14 Apr 1998 22:28:47 -0400 (EDT) Received: from oclc.org (fssun10.dev.oclc.org [132.174.19.11]) by aleve.media.mit.edu (8.8.7/ML970927) with SMTP id WAA16560 for ; Tue, 14 Apr 1998 22:28:47 -0400 (EDT) Received: from fscat.oclc.org (medusa.prod.oclc.org) by oclc.org (4.1/SMI-4.1) id AA06554; Tue, 14 Apr 98 22:28:15 EDT From: oclc-fs@oclc.org (First Search Mail) Message-Id: <9804150228.AA06554@oclc.org> To: Date: Tue, 14 Apr 1998 22:24:26 Subject: (1 of 1) Black hole entropy: a spacetime foam approach Status: O X-Status: ------------------------------------------------------------ PLEASE DO NOT REPLY OR SEND MESSAGES TO THIS EMAIL ADDRESS. ------------------------------------------------------------ NOTE: Marginal. SEARCH STRING: su:(entropy and time and space) DATABASE: Inspec COPYRIGHT: Copyright 1997, IEE RECORD NO.: 5639748 INSPEC Abstract No: A9717-9760L-002 AUTHOR: Scardigli, F. CORP SOURCE: Dipt. di Fisica, Milan Univ., Italy TITLE: Black hole entropy: a spacetime foam approach SOURCE: Classical and Quantum Gravity, vol.14, no.7, p. 1781-93 ISSN: 0264-9381 CODEN: CQGRDG PLACE OF PUBL: UK LANGUAGE: English PUBLISHER: IOP Publishing YEAR: July 1997 COPYRIGHT NO: 0264-9381/97/071781+13$19.50 TREATMENT: T Theoretical or Mathematical ABSTRACT: I introduce the spacetime foam structure by briefly reviewing the ideas of Wheeler (1957), topological fluctuations and the possibility of virtual black holes. The contribution of Jacobson (1995-the equation of state of the foam) is recalled. In the second part, I introduce a model of spacetime foam at the surface of the event horizon of a black hole. I apply these ideas to the calculus of the number of states of a black hole, of its entropy and of other thermodynamical properties. A formula for the number of micro-holes on the surface of the event horizon is derived. Subsequently, I extend the thermodynamical properties of the event horizon to thermodynamical properties of the space. Here I face the problem of the maximum entropy contained in a space region of a given volume. Finally, on the basis of the results obtained previously, I briefly treat the possibility of micro-black- hole creation by the Unruh effect (16 Refs.) DESCRIPTORS: black holes; entropy; space-time configurations; thermodynamic properties IDENTIFIERS: spacetime foam; virtual black holes; black hole entropy; topological fluctuations; equation of state; event horizon; thermodynamical properties; micro-holes; maximum entropy; micro-black-hole creation; Unruh effect CLASS CODES: A9760L (Black holes); A0570C (Thermodynamic functions and equations of state); A0240 (Geometry, differential geometry, and topology) ------------------------------------------------------------ Thanks for using FirstSearch. This e-mail account is only for distribution of FirstSearch documents. Please contact your librarian with comments or concerns. ------------------------------------------------------------ From oclc-fs@oclc.org Tue Apr 14 22:30:19 1998 Received: from aleve.media.mit.edu (aleve.media.mit.edu [18.85.2.171]) by ml.media.mit.edu (8.8.7/8.8.4) with ESMTP id WAA32058 for ; Tue, 14 Apr 1998 22:30:19 -0400 (EDT) Received: from oclc.org (fssun10.dev.oclc.org [132.174.19.11]) by aleve.media.mit.edu (8.8.7/ML970927) with SMTP id WAA30184 for ; Tue, 14 Apr 1998 22:30:18 -0400 (EDT) Received: from fscat.oclc.org (medusa.prod.oclc.org) by oclc.org (4.1/SMI-4.1) id AA06640; Tue, 14 Apr 98 22:29:46 EDT From: oclc-fs@oclc.org (First Search Mail) Message-Id: <9804150229.AA06640@oclc.org> To: Date: Tue, 14 Apr 1998 22:25:57 Subject: (1 of 1) Resource letter ITP-1: information theory in physics Status: O X-Status: ------------------------------------------------------------ PLEASE DO NOT REPLY OR SEND MESSAGES TO THIS EMAIL ADDRESS. ------------------------------------------------------------ NOTE: Should be an excelent resource. SEARCH STRING: su:(entropy and time and space) DATABASE: Inspec COPYRIGHT: Copyright 1997, IEE RECORD NO.: 5592114 INSPEC Abstract No: A9713-0150-021; B9707-6110-004 AUTHOR: Grandy, W.T., Jr. CORP SOURCE: Dept. of Phys. & Astron., Wyoming Univ., Laramie, WY, USA TITLE: Resource letter ITP-1: information theory in physics SOURCE: American Journal of Physics, vol.65, no.6, p. 466-76 ISSN: 0002-9505 CODEN: AJPIAS PLACE OF PUBL: USA LANGUAGE: English PUBLISHER: American Assoc. Phys. Teachers through AIP YEAR: June 1997 COPYRIGHT NO: 0002-9505/97/$10.00 TREATMENT: T Theoretical or Mathematical ABSTRACT: This Resource Letter provides a guide to the literature on the role of information theory in physics. Journal articles and books are cited for the following topics: early history, physical and mathematical connections, and a broad range of physical applications (160 Refs.) DESCRIPTORS: information theory; physics; reviews; teaching IDENTIFIERS: resource letter; information theory; physics; reviews; teaching; maximum entropy; atmospheric physics; acoustics; geophysics; mathematical physics; nonlinear dynamics; space- time; black hole physics; algorithmic information theory; quantum information theory; information paradox; quantum cryptography; quantum computing CLASS CODES: A0150 (Educational aids); A0155 (General Physics); A0130R (Reviews and tutorial papers; resource letters); B6110 (Information theory) ------------------------------------------------------------ Thanks for using FirstSearch. This e-mail account is only for distribution of FirstSearch documents. Please contact your librarian with comments or concerns. ------------------------------------------------------------ From oclc-fs@oclc.org Tue Apr 14 22:31:46 1998 Received: from aleve.media.mit.edu (aleve.media.mit.edu [18.85.2.171]) by ml.media.mit.edu (8.8.7/8.8.4) with ESMTP id WAA32250 for ; Tue, 14 Apr 1998 22:31:46 -0400 (EDT) Received: from oclc.org (fssun10.dev.oclc.org [132.174.19.11]) by aleve.media.mit.edu (8.8.7/ML970927) with SMTP id WAA23386 for ; Tue, 14 Apr 1998 22:31:45 -0400 (EDT) Received: from fscat.oclc.org (medusa.prod.oclc.org) by oclc.org (4.1/SMI-4.1) id AA06744; Tue, 14 Apr 98 22:31:13 EDT From: oclc-fs@oclc.org (First Search Mail) Message-Id: <9804150231.AA06744@oclc.org> To: Date: Tue, 14 Apr 1998 22:27:24 Subject: (1 of 1) Phase space approach to the gravitational arrow of time Status: O X-Status: ------------------------------------------------------------ PLEASE DO NOT REPLY OR SEND MESSAGES TO THIS EMAIL ADDRESS. ------------------------------------------------------------ NOTE: Another strong candidtate. SEARCH STRING: su:(entropy and time and space) DATABASE: Inspec COPYRIGHT: Copyright 1997, IEE RECORD NO.: 5531837 INSPEC Abstract No: A9709-9880-020 AUTHOR: Rothman, T.; Anninos, P. CORP SOURCE: Plasma Phys. Lab., Princeton Univ., NJ, USA TITLE: Phase space approach to the gravitational arrow of time SOURCE: Physical Review D, vol.55, no.4, p. 1948-63 ISSN: 0556-2821 CODEN: PRVDAQ PLACE OF PUBL: USA LANGUAGE: English PUBLISHER: APS through AIP YEAR: 15 Feb. 1997 COPYRIGHT NO: 0556-2821/97/55(4)1948(16)$10.00 TREATMENT: T Theoretical or Mathematical ABSTRACT: As the universe evolves, it becomes more inhomogeneous due to gravitational clumping. We attempt to find a function that characterizes this behavior and increases monotonically as inhomogeneity increases. We choose S=ln Omega as the candidate "gravitational entropy" function, where Omega is the phase-space volume below the Hamiltonian H of the system under consideration. We perform a direct calculation of Omega for transverse electromagnetic waves and gravitational wave, radiation, and density perturbations in an expanding FLRW universe. These calculations are carried out in the linear regime under the assumption that the phases of the oscillators comprising the system are random. Entropy is thus attributed to the lack of knowledge of the exact field configuration. The time dependence of H leads to a time- dependent Omega . We find that Omega , and, hence, ln Omega behaves as required. We also carry out calculations for Bianchi type IX cosmological models and find that, even in this homogeneous case, the function can be interpreted sensibly. We compare our results with Penrose's (1989) C/sup 2/ hypothesis. Because S is defined to resemble the fundamental statistical mechanics definition of entropy, we are able to recover the entropy in a variety of familiar circumstances including, evidently, black hole entropy. The results point to the utility of the relativistic Arnowitt- Deser-Misner (ADM) Hamiltonian formalism in establishing a connection between general relativity and statistical mechanics, although fully nonlinear calculations will need to be performed to remove any doubt (23 Refs.) DESCRIPTORS: cosmology; entropy; general relativity; gravitation IDENTIFIERS: gravitational arrow of time; gravitational clumping; inhomogeneity; gravitational entropy; phase-space volume; transverse electromagnetic waves; density perturbations; FLRW universe; Bianchi type IX cosmology; C/sup 2/ hypothesis; black hole entropy; Arnowitt-Deser-Misner Hamiltonian; ADM Hamiltonian; general relativity; statistical mechanics CLASS CODES: A9880D (Theoretical cosmology); A0420C (Fundamental problems and general formalism in general relativity); A0570C (Thermodynamic functions and equations of state) ------------------------------------------------------------ Thanks for using FirstSearch. This e-mail account is only for distribution of FirstSearch documents. Please contact your librarian with comments or concerns. ------------------------------------------------------------ From oclc-fs@oclc.org Tue Apr 14 22:37:09 1998 Received: from aleve.media.mit.edu (aleve.media.mit.edu [18.85.2.171]) by ml.media.mit.edu (8.8.7/8.8.4) with ESMTP id WAA32575 for ; Tue, 14 Apr 1998 22:37:08 -0400 (EDT) Received: from oclc.org (fssun10.dev.oclc.org [132.174.19.11]) by aleve.media.mit.edu (8.8.7/ML970927) with SMTP id WAA13938 for ; Tue, 14 Apr 1998 22:37:07 -0400 (EDT) Received: from fscat.oclc.org (medusa.prod.oclc.org) by oclc.org (4.1/SMI-4.1) id AA07035; Tue, 14 Apr 98 22:36:46 EDT From: oclc-fs@oclc.org (First Search Mail) Message-Id: <9804150236.AA07035@oclc.org> To: Date: Tue, 14 Apr 1998 22:32:57 Subject: (1 of 1) Comment on entropy in two-dimensional dilaton gravity Status: O X-Status: ------------------------------------------------------------ PLEASE DO NOT REPLY OR SEND MESSAGES TO THIS EMAIL ADDRESS. ------------------------------------------------------------ NOTE: Middling SEARCH STRING: su:(entropy and time and space and (relativity or gravity)) DATABASE: Inspec COPYRIGHT: Copyright 1996, FIZ Karlsruhe RECORD NO.: 5356718 INSPEC Abstract No: A9619-9760L-013 AUTHOR: Hirata, K.; Fujiwara, Y.; Soda, J. CORP SOURCE: Graduate Sch. of Human & Environ. Studies, Kyoto Univ., Japan TITLE: Comment on entropy in two-dimensional dilaton gravity SOURCE: Physics Letters B, vol.378, no.1-4, p. 68-77 ISSN: 0370-2693 CODEN: PYLBAJ PLACE OF PUBL: Netherlands LANGUAGE: English PUBLISHER: Elsevier YEAR: 20 June 1996 COPYRIGHT NO: 0370-2693/96/$12.00 TREATMENT: T Theoretical or Mathematical ABSTRACT: The thermodynamic second law in the evaporating black hole space-time is examined in the context of the two-dimensional dilaton black hole. The dynamical evolution of entropy is investigated by using the analytical perturbation method and the numerical method. It is shown that the thermodynamic second law holds in the vicinity of infalling shell and in the region far from the infalling shell in the case of the semi-classical CGHS model (1992). The analysis of general models is also presented and its implication is discussed (15 Refs.) DESCRIPTORS: black holes; entropy; gauge field theory; quantum gravity; space-time configurations IDENTIFIERS: entropy; 2D dilaton gravity; black holes; thermodynamic second law; dynamical evolution; infalling shell; semiclassical CGHS model; evaporating spacetimes; apparent horizon; generalized action; Callan-Giddings-Harvey- Strominger-model CLASS CODES: A9760L (Black holes); A9530S (Relativity and gravitation in astrophysics); A0460 (Quantum theory of gravitation); A0570 (Thermodynamics); A1225 (Models for gravitational interactions); A1110N (Gauge field theories) ------------------------------------------------------------ Thanks for using FirstSearch. This e-mail account is only for distribution of FirstSearch documents. Please contact your librarian with comments or concerns. ------------------------------------------------------------ From oclc-fs@oclc.org Tue Apr 14 22:38:09 1998 Received: from aleve.media.mit.edu (aleve.media.mit.edu [18.85.2.171]) by ml.media.mit.edu (8.8.7/8.8.4) with ESMTP id WAA31853 for ; Tue, 14 Apr 1998 22:38:09 -0400 (EDT) Received: from oclc.org (fssun10.dev.oclc.org [132.174.19.11]) by aleve.media.mit.edu (8.8.7/ML970927) with SMTP id WAA10888 for ; Tue, 14 Apr 1998 22:38:08 -0400 (EDT) Received: from fscat.oclc.org (medusa.prod.oclc.org) by oclc.org (4.1/SMI-4.1) id AA07062; Tue, 14 Apr 98 22:37:36 EDT From: oclc-fs@oclc.org (First Search Mail) Message-Id: <9804150237.AA07062@oclc.org> To: Date: Tue, 14 Apr 1998 22:33:47 Subject: (1 of 1) Thermodynamics of black hole in (N+3) dimensions from Status: O X-Status: ------------------------------------------------------------ PLEASE DO NOT REPLY OR SEND MESSAGES TO THIS EMAIL ADDRESS. ------------------------------------------------------------ NOTE: ??? SEARCH STRING: su:(entropy and time and space and (relativity or gravity)) DATABASE: Inspec COPYRIGHT: Copyright 1996, IEE RECORD NO.: 5166766 INSPEC Abstract No: A9604-9760L-018 AUTHOR: Oda, I. CORP SOURCE: Edogawa Univ., Nagareyama City, Japan TITLE: Thermodynamics of black hole in (N+3) dimensions from Euclidean N-brane theory SOURCE: Modern Physics Letters A, vol.10, no.36, p. 2775-82 ISSN: 0217-7323 CODEN: MPLAEQ PLACE OF PUBL: Singapore LANGUAGE: English PUBLISHER: World Scientific YEAR: 30 Nov. 1995 TREATMENT: T Theoretical or Mathematical ABSTRACT: In this letter we consider an N-brane description of an (N+3)-dimensional black hole horizon. First of all, we start by examining in more detail a previous work where a string theory is used in describing the dynamics of the event horizon of a four-dimensional black hole. This is an attempt to understand the black hole thermodynamics by an effective two-dimensional field theory of the event horizon of a black hole. Then we consider a particle model defined on a one- dimensional Euclidean line in a three-dimensional black hole as a target spacetime metric. By solving the field equations we find a "worldline instanton" which connects the past event horizon with the future one. This solution gives us the exact value of the Hawking temperature and to leading order the Bekenstein-Hawking formula of black hole entropy. We also show that this formalism is extensible to an arbitrary spacetime dimension. Finally we make a comment of many recent works of one-loop quantum correction to the black hole entropy (13 Refs.) DESCRIPTORS: black holes; entropy; extended objects; gauge field theory; quantum gravity; space-time configurations; string theory; thermodynamics IDENTIFIERS: thermodynamics; Euclidean N-brane theory; (N+3)D black hole horizon; string theory; event horizon; 4D black hole; effective 2D field theory; particle model; 1D Euclidean line; 3D black hole; target spacetime metric; worldline instanton; Hawking temperature; Bekenstein-Hawking formula; entropy; spacetime dimension; one-loop quantum correction CLASS CODES: A9760L (Black holes); A0570C (Thermodynamic functions and equations of state); A0460 (Quantum theory of gravitation); A1110N (Gauge field theories); A1117 (Theories of strings and other extended objects); A0240 (Geometry, differential geometry, and topology) ------------------------------------------------------------ Thanks for using FirstSearch. This e-mail account is only for distribution of FirstSearch documents. Please contact your librarian with comments or concerns. ------------------------------------------------------------ From oclc-fs@oclc.org Tue Apr 14 22:43:13 1998 Received: from aleve.media.mit.edu (aleve.media.mit.edu [18.85.2.171]) by ml.media.mit.edu (8.8.7/8.8.4) with ESMTP id WAA00641 for ; Tue, 14 Apr 1998 22:43:13 -0400 (EDT) Received: from oclc.org (fssun10.dev.oclc.org [132.174.19.11]) by aleve.media.mit.edu (8.8.7/ML970927) with SMTP id WAA19094 for ; Tue, 14 Apr 1998 22:43:12 -0400 (EDT) Received: from fscat.oclc.org (medusa.prod.oclc.org) by oclc.org (4.1/SMI-4.1) id AA07263; Tue, 14 Apr 98 22:42:40 EDT From: oclc-fs@oclc.org (First Search Mail) Message-Id: <9804150242.AA07263@oclc.org> To: Date: Tue, 14 Apr 1998 22:38:51 Subject: (1 of 1) Entropy production in a non-conservative gravitational Status: O X-Status: ------------------------------------------------------------ PLEASE DO NOT REPLY OR SEND MESSAGES TO THIS EMAIL ADDRESS. ------------------------------------------------------------ NOTE: Looks good... SEARCH STRING: su:(entropy and time and space and (relativity or gravity)) DATABASE: Inspec RECORD NO.: 3229503 INSPEC Abstract No: A88131652 AUTHOR: Wolf, C. CORP SOURCE: Dept. of Phys., North Adams State Coll., MA, USA TITLE: Entropy production in a non-conservative gravitational theory SOURCE: Astronomische Nachrichten, vol.309, no.3, p. 177-80 ISSN: 0004-6337 CODEN: ASNAAN PLACE OF PUBL: East Germany TRANSLATED IN: A04 LANGUAGE: English YEAR: 1988 TREATMENT: T Theoretical or Mathematical ABSTRACT: The production of entropy is calculated in a Friedman university governed by a nonconservative gravitational theory permitting the creation of matter. The calculation has two motivations, the first is that it represents a mechanism for generating the large entropy per baryon observed, and secondly, it simulates the ten dimensional mechanism for entropy production by out-of-equilibrium condition between massive string modes and massless modes with the added condition of energy nonconservative gravitation (7 Refs.) DESCRIPTORS: cosmology; entropy; general relativity; gravitation; space-time configurations; string theory IDENTIFIERS: continuous creation cosmology; matter creation; heterotic superstring theory; relativistic cosmology; gravitational field equations; flat metric; Friedman university; nonconservative gravitational theory; entropy per baryon; ten dimensional mechanism; entropy production; out-of- equilibrium condition; massive string modes; massless modes; energy nonconservative gravitation CLASS CODES: A0420J (Solutions to equations); A0450 (Unified field theories and other theories of gravitation); A0570C (Thermodynamic functions and equations of state); A9530S (Relativity and gravitation); A9880B (Origin and early evolution of the Universe); A9880D (Theoretical cosmology) ------------------------------------------------------------ Thanks for using FirstSearch. This e-mail account is only for distribution of FirstSearch documents. Please contact your librarian with comments or concerns. ------------------------------------------------------------ From oclc-fs@oclc.org Tue Apr 14 22:44:13 1998 Received: from aleve.media.mit.edu (aleve.media.mit.edu [18.85.2.171]) by ml.media.mit.edu (8.8.7/8.8.4) with ESMTP id WAA29576 for ; Tue, 14 Apr 1998 22:44:12 -0400 (EDT) Received: from oclc.org (fssun10.dev.oclc.org [132.174.19.11]) by aleve.media.mit.edu (8.8.7/ML970927) with SMTP id WAA14987 for ; Tue, 14 Apr 1998 22:44:11 -0400 (EDT) Received: from fscat.oclc.org (medusa.prod.oclc.org) by oclc.org (4.1/SMI-4.1) id AA07309; Tue, 14 Apr 98 22:43:39 EDT From: oclc-fs@oclc.org (First Search Mail) Message-Id: <9804150243.AA07309@oclc.org> To: Date: Tue, 14 Apr 1998 22:39:50 Subject: (1 of 1) Entropy generation, particle creation, and quantum field Status: O X-Status: ------------------------------------------------------------ PLEASE DO NOT REPLY OR SEND MESSAGES TO THIS EMAIL ADDRESS. ------------------------------------------------------------ NOTE: Title sounds promising -- may be to technical? SEARCH STRING: su:(entropy and time and space and (relativity or gravity)) DATABASE: Inspec RECORD NO.: 3205697 INSPEC Abstract No: A88114986 AUTHOR: Kandrup, H.E. CORP SOURCE: Dept. of Phys., Syracuse Univ., NY, USA TITLE: Entropy generation, particle creation, and quantum field theory in a cosmological spacetime: when do number and entropy increase? SOURCE: Physical Review D (Particles and Fields), vol.37, no.12, p. 3505-21 ISSN: 0556-2821 CODEN: PRVDAQ PLACE OF PUBL: USA TRANSLATED IN: A13 LANGUAGE: English YEAR: 15 June 1988 TREATMENT: T Theoretical or Mathematical ABSTRACT: This paper reexamines the statistical quantum field theory of a free, minimally coupled, real scalar field Phi in a statically bounded, classical Friedmann cosmology, where the time-dependent scale factor Omega (t) tends to constant values Omega /sub 1/ and Omega /sub 2/ for tt/sub 2/. The principal objective is to investigate the intuition that 'entropy' S correlates with average particle number (N), so that increases in (N) induced by parametric amplification manifest a one-to-one connection with increases in S. The definition of particle number N/sub k/ becomes unambiguous for t>t/sub 2/ and tS/sub n/(t/sub 1/), a result established rigorously in the limits of strong and weak particle creation (40 Refs.) DESCRIPTORS: cosmology; entropy; general relativity; matrix algebra; quantum field theory; scaling phenomena; space-time configurations IDENTIFIERS: entropy; particle creation; quantum field theory; cosmological spacetime; entropy; real scalar field; classical Friedmann cosmology; time-dependent scale factor; parametric amplification; Bogoliubov coefficients; density matrix; number representation; random phases CLASS CODES: A0210 (Algebra, set theory, and graph theory); A0420 (General relativity); A1110J (Asymptotic problems and properties); A9530C (Elementary particle and nuclear processes); A9530S (Relativity and gravitation); A9880D (Theoretical cosmology) ------------------------------------------------------------ Thanks for using FirstSearch. This e-mail account is only for distribution of FirstSearch documents. Please contact your librarian with comments or concerns. ------------------------------------------------------------ From oclc-fs@oclc.org Tue Apr 14 22:44:57 1998 Received: from aleve.media.mit.edu (aleve.media.mit.edu [18.85.2.171]) by ml.media.mit.edu (8.8.7/8.8.4) with ESMTP id WAA32472 for ; Tue, 14 Apr 1998 22:44:56 -0400 (EDT) Received: from oclc.org (fssun10.dev.oclc.org [132.174.19.11]) by aleve.media.mit.edu (8.8.7/ML970927) with SMTP id WAA21354 for ; Tue, 14 Apr 1998 22:44:56 -0400 (EDT) Received: from fscat.oclc.org (medusa.prod.oclc.org) by oclc.org (4.1/SMI-4.1) id AA07339; Tue, 14 Apr 98 22:44:24 EDT From: oclc-fs@oclc.org (First Search Mail) Message-Id: <9804150244.AA07339@oclc.org> To: Date: Tue, 14 Apr 1998 22:40:35 Subject: (1 of 1) Physical concept of time from Newton to present day Status: O X-Status: ------------------------------------------------------------ PLEASE DO NOT REPLY OR SEND MESSAGES TO THIS EMAIL ADDRESS. ------------------------------------------------------------ NOTE: May be an excelent resource. SEARCH STRING: su:(entropy and time and space and (relativity or gravity)) DATABASE: Inspec RECORD NO.: 3027063 INSPEC Abstract No: A88000059 AUTHOR: Chernin, A.D. TITLE: Physical concept of time from Newton to present day SOURCE: Priroda, no.8, p. 27-37 ISSN: 0032-874X CODEN: PRIRA3 PLACE OF PUBL: USSR TRANSLATED IN: T02 LANGUAGE: Russian YEAR: Aug. 1987 TREATMENT: G General Review ABSTRACT: Time, regarded by Newton as the first of the basic concepts of the physical sciences ahead of space, place and movement, is discussed with special reference to the development of ideas regarding time since Newton's day. Among concepts considered are absolute time and space, the symmetry of time, the laws of conservation, relativity, the time zero, time in the quantum world, the physical vacuum from which the world developed, and the passage, irreversibility and one-dimensionality of time. It is concluded that much has been learned about time and many new concepts have been developed since Newton's death but much remains uncertain (0 Refs.) DESCRIPTORS: astronomy and astrophysics; history; physics fundamentals; quantum theory; relativity; reviews; space-time configurations IDENTIFIERS: Isaac Newton; physical concepts; absolute space-time; conservation laws; entropy; Universe origin; vacuum fluctuation; one-dimensional time; time passage; irreversible time; time; physical sciences; relativity; time zero; quantum world; physical vacuum CLASS CODES: A0165 (History of science); A0330 (Special relativity); A0365 (Quantum theory; quantum mechanics); A0400 (Relativity and gravitation); A9530S (Relativity and gravitation) ------------------------------------------------------------ Thanks for using FirstSearch. This e-mail account is only for distribution of FirstSearch documents. Please contact your librarian with comments or concerns. ------------------------------------------------------------ From oclc-fs@oclc.org Tue Apr 14 22:46:00 1998 Received: from aleve.media.mit.edu (aleve.media.mit.edu [18.85.2.171]) by ml.media.mit.edu (8.8.7/8.8.4) with ESMTP id WAA02372 for ; Tue, 14 Apr 1998 22:45:59 -0400 (EDT) Received: from oclc.org (fssun10.dev.oclc.org [132.174.19.11]) by aleve.media.mit.edu (8.8.7/ML970927) with SMTP id WAA26797 for ; Tue, 14 Apr 1998 22:45:58 -0400 (EDT) Received: from fscat.oclc.org (medusa.prod.oclc.org) by oclc.org (4.1/SMI-4.1) id AA07382; Tue, 14 Apr 98 22:45:12 EDT From: oclc-fs@oclc.org (First Search Mail) Message-Id: <9804150245.AA07382@oclc.org> To: Date: Tue, 14 Apr 1998 22:41:23 Subject: (1 of 1) Mass, dual mass, and gravitational entropy Status: O X-Status: ------------------------------------------------------------ PLEASE DO NOT REPLY OR SEND MESSAGES TO THIS EMAIL ADDRESS. ------------------------------------------------------------ NOTE: Possibly good, sounds technical... SEARCH STRING: su:(entropy and time and space and (relativity or gravity)) DATABASE: Inspec RECORD NO.: 3005696 INSPEC Abstract No: A87140150 AUTHOR: Magnon, A. CORP SOURCE: Dept. of Phys., Syracuse Univ., NY, USA TITLE: Mass, dual mass, and gravitational entropy SOURCE: Journal of Mathematical Physics, vol.28, no.9, p. 2149-54 ISSN: 0022-2488 CODEN: JMAPAQ PLACE OF PUBL: USA TRANSLATED IN: B03 LANGUAGE: English YEAR: Sept. 1987 COPYRIGHT NO: 0022-2488/87/092149-06$02.50 TREATMENT: T Theoretical or Mathematical ABSTRACT: A mechanism (mathematical transformation) is considered by which a (Schwarzschild) black-hole singularity can be converted into a (Taub-NUT) (Newman-Unit-Tamburino) wire singularity, or equivalently topological modifications can be induced (e.g. transformation of S/sup 2/*R/sup 2/ topology into S/sup 3/*R and conversely). A topological charge-an invariant of the transformation-emerges as a possible candidate for the description of gravitational entropy in the case of source-free solutions to Einstein's equation with one Killing vector field. For a Schwarzschild black hole this invariant reduces to the area of the event horizon (or equivalently the Bolt charge) and it reduces to the square of the NUT charge (or equivalently the length of the closed timelike orbits) in the case of a Taub-NUT magnetic monopole. These considerations lead to the proposition that, under extreme conditions, gravitational clumping or entropy increase could be described by a modification in the characteristic classes of the space-time manifold due to the onset of nontrivial topological features. Further remarks are presented in view of the role of gravitational magnetic monopoles in quantum gravity, and of a possible relation between the notions of gravitational entropy and arrow of time (18 Refs.) DESCRIPTORS: black holes; entropy; Schwarzschild metric IDENTIFIERS: dual mass; gravitational entropy; black-hole singularity; topological modifications; source-free solutions; Einstein's equation; one Killing vector field; Schwarzschild black hole CLASS CODES: A0420J (Solutions to equations); A9530S (Relativity and gravitation); A9760L (Black holes) ------------------------------------------------------------ Thanks for using FirstSearch. This e-mail account is only for distribution of FirstSearch documents. Please contact your librarian with comments or concerns. ------------------------------------------------------------ From oclc-fs@oclc.org Tue Apr 14 22:46:36 1998 Received: from aleve.media.mit.edu (aleve.media.mit.edu [18.85.2.171]) by ml.media.mit.edu (8.8.7/8.8.4) with ESMTP id WAA23792 for ; Tue, 14 Apr 1998 22:46:36 -0400 (EDT) Received: from oclc.org (fssun10.dev.oclc.org [132.174.19.11]) by aleve.media.mit.edu (8.8.7/ML970927) with SMTP id WAA30556 for ; Tue, 14 Apr 1998 22:46:35 -0400 (EDT) Received: from fscat.oclc.org (medusa.prod.oclc.org) by oclc.org (4.1/SMI-4.1) id AA07426; Tue, 14 Apr 98 22:46:03 EDT From: oclc-fs@oclc.org (First Search Mail) Message-Id: <9804150246.AA07426@oclc.org> To: Date: Tue, 14 Apr 1998 22:42:14 Subject: (1 of 1) The birth of time Status: O X-Status: ------------------------------------------------------------ PLEASE DO NOT REPLY OR SEND MESSAGES TO THIS EMAIL ADDRESS. ------------------------------------------------------------ NOTE: Looks very good if accessable. SEARCH STRING: su:(entropy and time and space and (relativity or gravity)) DATABASE: Inspec RECORD NO.: 2737547 INSPEC Abstract No: A86109662 AUTHOR: Geheniau, J.; Prigogine, I. CORP SOURCE: Service de Chimie Phys. II, Brussels, Belgium TITLE: The birth of time SOURCE: Foundations of Physics, vol.16, no.5, p. 437-43 ISSN: 0015-9018 CODEN: FNDPA4 PLACE OF PUBL: USA TRANSLATED IN: A03 LANGUAGE: English YEAR: May 1986 COPYRIGHT NO: 0015-9018/86/0500-0437$05.00/0 TREATMENT: T Theoretical or Mathematical ABSTRACT: The formulation of the second law of thermodynamics in the frame of general relativity is reconsidered in the case of an isotropic homogeneous universe. The authors show that there appears then a direct link between the cosmological state of the Universe, as expressed in terms of conformal coordinates, and quantities such as energy density, pressure, and entropy associated with the description of nature. In the early universe there appears a kind of phase transition due to transfer of gravitational energy to matter associated with the cosmological expansion if the universe starts with a non-Euclidian (space) state. As a result, they may envisage the possibility of a 'cold big-bang model', in which the Universe would start at zero temperature and entropy. The temperature goes then through a maximum before entering the present area of cooling related to adiabatic expansion (16 Refs.) DESCRIPTORS: cosmology; entropy; general relativity; thermodynamics IDENTIFIERS: cold big bang model; time; second law; thermodynamics; general relativity; isotropic homogeneous universe; cosmological state; energy density; pressure; entropy; phase transition; gravitational energy; zero temperature CLASS CODES: A0420C (Fundamental problems and general formalism in general relativity); A0570 (Thermodynamics); A9530S (Relativity and gravitation in astrophysics); A9880B (Origin and early evolution of the Universe) ------------------------------------------------------------ Thanks for using FirstSearch. This e-mail account is only for distribution of FirstSearch documents. Please contact your librarian with comments or concerns. ------------------------------------------------------------ From oclc-fs@oclc.org Tue Apr 14 22:48:14 1998 Received: from aleve.media.mit.edu (aleve.media.mit.edu [18.85.2.171]) by ml.media.mit.edu (8.8.7/8.8.4) with ESMTP id WAA00245 for ; Tue, 14 Apr 1998 22:48:13 -0400 (EDT) Received: from oclc.org (fssun10.dev.oclc.org [132.174.19.11]) by aleve.media.mit.edu (8.8.7/ML970927) with SMTP id WAA01847 for ; Tue, 14 Apr 1998 22:48:13 -0400 (EDT) Received: from fscat.oclc.org (medusa.prod.oclc.org) by oclc.org (4.1/SMI-4.1) id AA07498; Tue, 14 Apr 98 22:47:41 EDT From: oclc-fs@oclc.org (First Search Mail) Message-Id: <9804150247.AA07498@oclc.org> To: Date: Tue, 14 Apr 1998 22:43:52 Subject: (1 of 1) Observational homogeneity of the Universe Status: O X-Status: ------------------------------------------------------------ PLEASE DO NOT REPLY OR SEND MESSAGES TO THIS EMAIL ADDRESS. ------------------------------------------------------------ NOTE: May be of some use? technical. SEARCH STRING: su:(entropy and time and space and (relativity or gravity)) DATABASE: Inspec RECORD NO.: 2642010 INSPEC Abstract No: A86053991 AUTHOR: Bonnor, W.B.; Ellis, G.F.R. CORP SOURCE: Dept. of Appl. Math., Cape Town Univ., Rondebosch, South Africa TITLE: Observational homogeneity of the Universe SOURCE: Monthly Notices of the Royal Astronomical Society, vol.218, no.4, p. 605-14 ISSN: 0035-8711 CODEN: MNRAA4 PLACE OF PUBL: UK TRANSLATED IN: A02 LANGUAGE: English YEAR: 15 Feb. 1986 TREATMENT: T Theoretical or Mathematical ABSTRACT: A new approach to observational homogeneity is presented. The observation that stars and galaxies in distant regions appear similar to those nearby may be taken to imply that matter has had a similar thermodynamic history in widely separated parts of the Universe (the Postulate of Uniform Thermal Histories, or PUTH). It is supposed that similar thermodynamic histories imply similar dynamical histories. Then the distant apparent similarity is evidence for spatial homogeneity of the Universe. Using General Relativity to test this idea the authors take a perfect fluid model and implement PUTH by the condition that the density and entropy per baryon shall be the same function of the proper time along all galaxy world-lines. The standard models of cosmology, the Bianchi models, and the Kantowski-Sachs models all satisfy this condition, and are all spatially homogeneous. The authors ask whether this condition ensures spatial homogeneity in general. Examples are found which show that it does not (20 Refs.) DESCRIPTORS: cosmology; general relativity; space-time configurations IDENTIFIERS: Universe observational homogeneity; relativistic cosmology; spatially homogeneous cosmological models; spatially inhomogeneous models; distant stars; Uniform Thermal Histories Postulate; distant galaxies; density-proper time relation; Einstein equations solutions; entropy per baryon- proper time relation; Postulate of Uniform Thermal Histories; PUTH; thermodynamic histories; dynamical histories; spatial homogeneity; General Relativity; perfect fluid model; galaxy world-lines; Bianchi models; Kantowski- Sachs models CLASS CODES: A0420J (Solutions to equations in general relativity); A9530S (Relativity and gravitation in astrophysics); A9880 (Cosmology); A9880D (Theoretical cosmology) ------------------------------------------------------------ Thanks for using FirstSearch. This e-mail account is only for distribution of FirstSearch documents. Please contact your librarian with comments or concerns. ------------------------------------------------------------ From oclc-fs@oclc.org Tue Apr 14 22:49:36 1998 Received: from aleve.media.mit.edu (aleve.media.mit.edu [18.85.2.171]) by ml.media.mit.edu (8.8.7/8.8.4) with ESMTP id WAA14161 for ; Tue, 14 Apr 1998 22:49:35 -0400 (EDT) Received: from oclc.org (fssun10.dev.oclc.org [132.174.19.11]) by aleve.media.mit.edu (8.8.7/ML970927) with SMTP id WAA14582 for ; Tue, 14 Apr 1998 22:49:35 -0400 (EDT) Received: from fscat.oclc.org (medusa.prod.oclc.org) by oclc.org (4.1/SMI-4.1) id AA07599; Tue, 14 Apr 98 22:49:02 EDT From: oclc-fs@oclc.org (First Search Mail) Message-Id: <9804150249.AA07599@oclc.org> To: Date: Tue, 14 Apr 1998 22:45:14 Subject: (1 of 1) Paradoxes in the theory of relativity Status: O X-Status: ------------------------------------------------------------ PLEASE DO NOT REPLY OR SEND MESSAGES TO THIS EMAIL ADDRESS. ------------------------------------------------------------ NOTE: Looks general and non-technical -- may be of interest SEARCH STRING: su:(entropy and time and space and (relativity or gravity)) DATABASE: Inspec RECORD NO.: 19613 INSPEC Abstract No: A69012877 AUTHOR: Terletskii, Ya.P. TITLE: Paradoxes in the theory of relativity SOURCE: p. xi + 120 PLACE OF PUBL: USA LANGUAGE: English PUBLISHER: Plenum Press; New York, NY, USA YEAR: 1968 ABSTRACT: This book is devoted to the exposition, examination, and clarification of such 'paradoxes' from the point of view of relativistic ideas about space and time. Paradoxes (mainly of a philosophical nature) associated with the contradiction that exists between the name and the true content of the theory of relativity are examined first of all. It is established that the theory of relativity, understood as the modern theory of the interrelation between space and time, does not provide any grounds for positivistic conclusions. Fundamentally new theoretical results are reached through an analysis of the paradoxes associated with the assertion that the velocity of light cannot be exceeded. It is established that the principle of causality, correctly interpreted as an expression or consequence of the law concerning the increase in entropy, does not provide an absolute prohibition of superlight velocities for the transfer of physical effects. The elucidation of this fact allows one to make a number of theoretical predictions concerning the possibility of the existence of fundamentally new physical objects and processes which one can attempt to detect experimentally. Among such objects are particles of negative mass. An analysis of the results that could be derived from a discovery of such particles is made in the book. In particular, it is shown that extremely powerful energy sources may occur if particles of negative mass really exist in nature DESCRIPTORS: elementary particles; relativity CLASS CODES: A0330 (Special relativity); A0420 (General relativity) ------------------------------------------------------------ Thanks for using FirstSearch. This e-mail account is only for distribution of FirstSearch documents. Please contact your librarian with comments or concerns. ------------------------------------------------------------