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[null,"1.","Record Nr.",null,"UNINA9910458433803321"]
[null,null,"Autore",null,"Simeone Claudio"]
[null,null,"Titolo",null,"Deparametrization and path integral quantization of cosmological models [[electronic resource] /] / Claudio Simeone"]
[null,null,"Pubbl/distr/stampa",null,"Singapore ; ; River Edge, NJ, : World Scientific, c2001"]
[null,null,"ISBN",null,"981-277-837-3"]
[null,null,"Descrizione fisica",null,"1 online resource (152 p.)"]
[null,null,"Collana",null,"World scientific lecture notes in physics ; ; v. 69"]
[null,null,"Disciplina",null,"523.1"]
[null,null,"Soggetti",null,"Quantum gravity"]
[{"$nulls":4},"Space and time"]
[{"$nulls":4},"Path integrals"]
[{"$nulls":4},"Gauge invariance"]
[{"$nulls":4},"Hamiltonian systems"]
[{"$nulls":4},"Electronic books."]
[null,null,"Lingua di pubblicazione",null,"Inglese"]
[null,null,"Formato",null,"Materiale a stampa"]
[null,null,null,"Livello bibliografico","Monografia"]
[null,null,null,"Note generali","Description based upon print version of record."]
[null,null,null,"Nota di bibliografia","Includes bibliographical references and index."]
[null,null,"Nota di contenuto",null,"Contents               ; Preface              ; Chapter 1 Introduction                             ; Chapter 2 The gravitational field as a constrained Hamiltonian system                                                                            ; 2.1 Momentum and Hamiltonian constraints                                               ; 2.2 Minisuperspaces as constrained systems                                                 ; 2.3 Quantization                       ; 2.3.1 Canonical quantization"]
[{"$nulls":4},"2.3.2 Path integral quantization                                       Chapter 3 Deparametrization and path integral quantization                                                                 ; 3.1 The identification of time                                     ; 3.1.1 Gauge fixation and deparametrization                                                 ; 3.1.2 Topology of the constraint surface: intrinsic and extrinsic time"]
[{"$nulls":4},"3.2 Gauge-invariant action for a parametrized system                                                           3.2.1 End point terms                            ; 3.2.2 Observables and time                                 ; 3.2.3 Non separable constraints                                      ; 3.3 Path integral                        ; 3.3.1 General formalism                              ; 3.3.2 The function f and the reduced Hamiltonian. Unitarity                                                                  ; 3.4 Examples"]
[{"$nulls":4},"3.4.1 Feynman propagator for the Klein-Gordon equation                                                             3.4.2 The ideal clock                            ; 3.4.3 Transition probability for empty Friedmann-Robertson-Walker universes                                                                                  ; Chapter 4 Homogeneous relativistic cosmologies                                                     ; 4.1 Isotropic universes                              ; 4.1.1 A toy model                        "]
[{"$nulls":4},"; 4.1.2 True degrees of freedom"]
[{"$nulls":4},"4.1.3 A more general constraint                                      4.1.4 Extrinsic time. The closed \"\"de Sitter\"\" universe                                                            ; 4.1.5 Comment                    ; 4.2 Anisotropic universes                                ; 4.2.1 The Kantowski-Sachs universe                                         ; 4.2.2 The Taub universe                              ; 4.2.3 Other anisotropic models                                     ; Chapter 5 String cosmologies"]
[{"$nulls":4},"5.1 String theory on background fields"]
[null,null,null,"Sommario/riassunto","The problem of time is a central feature of quantum cosmology: differing from ordinary quantum mechanics, in cosmology there is nothing \"outside\" the system which plays the role of clock, and this makes difficult the obtention of a consistent quantization. A possible solution is to assume that a subset of the variables describing the state of the universe can be a clock for the remaining of the system. Following this line, in this book a new proposal consisting in the previous identification of time by means of gauge fixation is applied to the quantization of homogeneous cosmological models."]