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1. |
Record Nr. |
UNISA990002899550203316 |
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Autore |
MASCHERONI, Giovanna |
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Titolo |
Breve dizionario dei nuovi media / Giovanna Mascheroni, Francesca Pasquali |
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Pubbl/distr/stampa |
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ISBN |
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Descrizione fisica |
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Collana |
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Le bussole ; 230 = Scienze della comunicazione |
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Altri autori (Persone) |
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Disciplina |
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Soggetti |
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Comunicazione di massa - Dizionario |
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Collocazione |
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Lingua di pubblicazione |
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Formato |
Materiale a stampa |
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Livello bibliografico |
Monografia |
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2. |
Record Nr. |
UNINA9910786026503321 |
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Autore |
Brown John David |
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Titolo |
Lower dimensional gravity [[electronic resource] /] / John David Brown |
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Pubbl/distr/stampa |
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Singapore ; ; Teaneck, N.J., : World Scientific, c1988 |
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ISBN |
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1-283-97143-7 |
981-4434-17-5 |
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Descrizione fisica |
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1 online resource (164 p.) |
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Disciplina |
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Soggetti |
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Quantum gravity |
Supergravity |
Gauge fields (Physics) |
General relativity (Physics) |
Symmetry (Physics) |
Space and time |
Particles (Nuclear physics) |
Mathematical physics |
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Lingua di pubblicazione |
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Formato |
Materiale a stampa |
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Livello bibliografico |
Monografia |
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Note generali |
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A revised version of the author' thesis. Cf. p. v. |
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Nota di bibliografia |
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Includes bibliographical references. |
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Nota di contenuto |
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CONTENTS; I INTRODUCTION; I.1 Three Dimensional Gravity; I.2 Two Dimensional Gravity; References for Chapter I; II THE ASYMPTOTIC STRUCTURE OF THREE DIMENSIONAL GRAVITY; II.1 Introduction; II.2 Solutions To Three Dimensional Gravity With Λ < 0; II.3 Global Charges and the RxSO(2) Asymptotic Symmetries; II.4 The Conformal Group Of Asymptotic Symmetries; IV.5 The Canonical Realization Of Asymptotic Symmetries; II. Appendix 1: The Initial Value Problem; II. Appendix 2: The Lie and Surface Deformation Algebras; References for Chapter II; III BL.ACK HOLES IN TWO SPACETIME DIMENSIONS |
III.1 Point Sources in Two Dimensional GravityIII.2 Black Hole Solutions; References for Chapter III; IV NEUTRALIZATION OF THE COSMOLOGICAL CONSTANT IN TWO SPACETIME DIMENSIONS; IV.I Introduction; IV.1a. Particle creation.; IV.1b. Neutralization of the cosmological constant.; IV.1c. Additional features of particle creation.; IV.1d. Overview.; IV.2 Pair Creation Without Gravity; IV.2a. Lorentzian solutions.; IV.2b. |
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Instantons.; IV.2c. Action and probability.; IV.3 Adding Gravity; IV.3a. The gravitational equation.; IV.3b. Geometry of the instantons.; IV.4 Instantons For Pair Creation |
IV..4a. Solving the equations.IV.4b. Interpretation.; IV.5 The Gravitational Action; IV.5a. Coordinate invariance.; IV.5b. Surface terms.; IV.6 Probability For Particle Creation; IV.6a. Type 1 instantons.; IV.6b. Topology change.; IV.6c. Dependence on m and e.; IV.7 The Cosmological Constant; IV.7a. Evolution from de Sitter spacetime.; IV.7b. Evolution to (nearly) flat spacetime.; IV.8 Membrane Creation In Four Dimensions; IV.8a. Four dimensional generalization.; IV.8b. Instantons.; IV.8c. Probability.; IV.8d. Neutralizing the cosmological constant.; References for Chapter IV |
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Sommario/riassunto |
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This book addresses the subject of gravity theories in two and three spacetime dimensions. The prevailing philosophy is that lower dimensional models of gravity provide a useful arena for developing new ideas and insights, which are applicable to four dimensional gravity. The first chapter consists of a comprehensive introduction to both two and three dimensional gravity, including a discussion of their basic structures. In the second chapter, the asymptotic structure of three dimensional Einstein gravity with a negative cosmological constant is analyzed. The third chapter contains a treatment |
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