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[null,"1.","Record Nr.",null,"UNINA9910915674803321"]
[null,null,"Autore",null,"C João"]
[null,null,"Titolo",null,"The P(φ) 2 Model on de Sitter Space"]
[null,null,"Pubbl/distr/stampa",null,"Providence : , : American Mathematical Society, , 2023"]
[{"$nulls":4},"©2023"]
[null,null,"ISBN",null,"1-4704-7322-4"]
[null,null,"Edizione",null,"[1st ed.]"]
[null,null,"Descrizione fisica",null,"1 online resource (282 pages)"]
[null,null,"Collana",null,"Memoirs of the American Mathematical Society ; ; v.281"]
[null,null,"Classificazione",null,"81T0581T0881T2022E4347L90"]
[null,null,"Disciplina",null,"530.152/556"]
[{"$nulls":4},"530.152556"]
[null,null,"Soggetti",null,"Operator algebras"]
[{"$nulls":4},"Generalized spaces"]
[{"$nulls":4},"Lorentz groups"]
[{"$nulls":4},"Manifolds (Mathematics)"]
[{"$nulls":4},"Quantum field theory"]
[{"$nulls":4},"Quantum theory -- Quantum field theory; related classical field theories -- Axiomatic quantum field theory; operator algebras"]
[{"$nulls":4},"Quantum theory -- Quantum field theory; related classical field theories -- Constructive quantum field theory"]
[{"$nulls":4},"Quantum theory -- Quantum field theory; related classical field theories -- Quantum field theory on curved space backgrounds"]
[{"$nulls":4},"Topological groups, Lie groups -- Lie groups -- Structure and representation of the Lorentz group"]
[{"$nulls":4},"Operator theory -- Linear spaces and algebras of operators -- Applications of operator algebras to physics"]
[null,null,"Lingua di pubblicazione",null,"Inglese"]
[null,null,"Formato",null,"Materiale a stampa"]
[null,null,null,"Livello bibliografico","Monografia"]
[null,null,"Nota di contenuto",null,"Cover -- Title page -- List of Symbols -- Preface -- Part 1. De Sitter space -- Chapter 1. De Sitter space as a Lorentzian manifold -- 1.1. The Einstein equations -- 1.2. De Sitter space -- 1.3. The Lorentz group -- 1.4. Hyperbolicity -- 1.5. Causally complete regions -- 1.6. Complexified de Sitter space -- 1.7. The Euclidean sphere -- Chapter 2. Space-time symmetries -- 2.1. The isometry group of de Sitter space -- 2.2. Horospheres -- 2.3. The Cartan decomposition of   ₀(1,2) -- 2.4. An alternative decomposition of   ₀(1,2) -- 2.5. The Iwasawa decomposition of   ₀(1,2) -- 2.6. The Hannabuss decomposition of   ₀(1,2) -- 2.7. Homogeneous spaces, cosets and orbits -- 2.8. The complex Lorentz group -- Chapter 3. Induced representations for the "]
[{"$nulls":4},"Lorentz group -- 3.1. Integration on homogeneous spaces -- 3.2. Induced representations -- 3.3. Reducible representations on the light-cone -- 3.4. Unitary irreducible representations on a circle lying on the lightcone -- 3.5. Intertwiners -- 3.6. The time reflection -- 3.7. Unitary irreducible representations on two mass shells -- Chapter 4. Harmonic analysis on the hyperboloid -- 4.1. Plane waves -- 4.2. The Fourier-Helgason transformation -- 4.3. The Plancherel theorem on the hyperboloid -- 4.4. Unitary irreducible representations on de Sitter space -- 4.5. The Euclidean one-particle Hilbert space over the sphere -- 4.6. Unitary irreducible representations on the time-zero circle -- 4.7. Reflection positivity: From   (3) to   (1,2) -- 4.8. Time-symmetric and time-antisymmetric test-functions -- 4.9. Fock space -- Part 2. Free quantum fields -- Chapter 5. Classical field theory -- 5.1. The classical equations of motion -- 5.2. Conservation laws -- 5.3. The covariant classical dynamical system -- 5.4. The restriction of the KG equation to a (double) wedge -- 5.5. The canonical classical dynamical system."]
[{"$nulls":4},"Chapter 6. Quantum one-particle structures -- 6.1. The covariant one-particle structure -- 6.2. One-particle structures with positive and negative energy -- 6.3. One-particle KMS structures -- 6.4. The canonical one-particle structure -- 6.5. Localisation -- 6.6. Standard subspaces of ̂ ( ¹) -- Chapter 7. Local algebras for the free field -- 7.1. The covariant net of local algebras on -- 7.2. The canonical net of local  *-algebras on  ¹ -- 7.3. Euclidean fields and the net of local algebras on  ² -- 7.4. The reconstruction of free quantum fields on de Sitter space -- Part 3. Interacting quantum fields -- Chapter 8. The interacting vacuum -- 8.1. Short-distance properties of the covariance -- 8.2. (Non-)Commutative  ^{ }-spaces -- 8.3. The Euclidean interaction -- 8.4. The interacting vacuum vector -- Chapter 9. The interacting representation of   (1,2) -- 9.1. The reconstruction of the interacting boosts -- 9.2. A unitary representation of the Lorentz group -- 9.3. Perturbation formulas for the boosts -- Chapter 10. Local algebras for the interacting field -- 10.1. Finite speed of propagation for the  ( )₂ model -- 10.2. The Haag-Kastler axioms -- Chapter 11. The equations of motion and the stress-energy tensor -- 11.1. The stress-energy tensor -- 11.2. The equations of motion -- Chapter 12. Summary -- 12.1. The conceptional structure -- 12.2. Wightman function, particle content and scattering theory -- 12.3. A detailed summary -- Appendix A. A local flat tube theorem -- Appendix B. One particle structures -- Appendix C. Sobolev spaces on the circle and on the sphere -- Appendix D. Some identities involving Legendre functions -- Bibliography -- Index -- Back Cover."]
[null,null,null,"Sommario/riassunto","\"In 1975 Figari, Høegh-Krohn and Nappi constructed the P(Phi)2 model on the de Sitter space. Here we complement their work with new results, which connect this model to various areas of mathematics. In particular, i.) we discuss the causal structure of de Sitter space and the induces representations of the Lorentz group. We show that the UIRs of SO0(1, 2) for both the principal and the complementary series can be formulated on Hilbert spaces whose functions are supported on a Cauchy surface. We describe the free classical dynamical system in both its covariant and canonical form, and present the associated quantum one-particle KMS structures in the sense of Kay (1985). Furthermore, we discuss the localisation properties of one-particle wave functions and how these properties are inherited by the algebras of local observables. ii.) we describe the relations between the modular objects (in the sense of Tomita-Takesaki theory) associated to wedge algebras and the representations of the Lorentz group. We connect the representations of SO(1,2) to unitary representations of SO(3) on the "]
[{"$nulls":4},"Euclidean sphere, and discuss how the P(Phi)2 interaction can be represented by a rotation invariant vector in the Euclidean Fock space. We present a novel Osterwalder-Schrader reconstruction theorem, which shows that physical infrared problems are absent on de Sitter space. As shown in Figari, Hoegh-Krohn, and Nappi (1975), the ultraviolet problems are resolved just like on flat Minkowski space. We state the Haag-Kastler axioms for the P(Phi)2 model and we explain how the generators of the boosts and the rotations for the interacting quantum field theory arise from the stress-energy tensor. Finally, we show that the interacting quantum fields satisfy the equations of motion in their covariant form. In summary, we argue that the de Sitter P(Phi)2 model is the simplest and most explicit relativistic quantum field theory, which satisfies basic expectations, like covariance, particle creation, stability and finite speed of propagation\"--"]
[null,"2.","Record Nr.",null,"UNIORUON00039961"]
[null,null,"Titolo",null,"Histoire ancienne du Tibet / Paul Pelliot"]
[null,null,"Pubbl/distr/stampa",null,"Paris, : Maisonneuve, 1961"]
[null,null,"Descrizione fisica",null,"168 p. ; 24 cm"]
[null,null,"Classificazione",null,"TIB IV A"]
[null,null,"Soggetti",null,"TIBET (CINA) - STORIA"]
[null,null,"Lingua di pubblicazione",null,"Francese"]
[null,null,"Formato",null,"Materiale a stampa"]
[null,null,null,"Livello bibliografico","Monografia"]