Gravitational thermodynamics of causal diamonds in (A)dS
| Autor: | Manus R. Visser, Ted Jacobson |
|---|---|
| Přispěvatelé: | String Theory (ITFA, IoP, FNWI) |
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
Physics
High Energy Physics - Theory Spacetime 010308 nuclear & particles physics Thermodynamic equilibrium FOS: Physical sciences General Physics and Astronomy Thermodynamics General Relativity and Quantum Cosmology (gr-qc) Cosmological constant 01 natural sciences General Relativity and Quantum Cosmology lcsh:QC1-999 Gravitation Killing vector field High Energy Physics - Theory (hep-th) De Sitter universe 0103 physical sciences Minkowski space 010306 general physics Entropy (arrow of time) lcsh:Physics |
| Zdroj: | SciPost Physics, 7(6):079. SciPost Foundation SciPost Physics, Vol 7, Iss 6, p 079 (2019) |
| ISSN: | 2542-4653 |
| Popis: | The static patch of de Sitter spacetime and the Rindler wedge of Minkowski spacetime are causal diamonds admitting a true Killing field, and they behave as thermodynamic equilibrium states under gravitational perturbations. We explore the extension of this gravitational thermodynamics to all causal diamonds in maximally symmetric spacetimes. Although such diamonds generally admit only a conformal Killing vector, that seems in all respects to be sufficient. We establish a Smarr formula for such diamonds and a "first law" for variations to nearby solutions. The latter relates the variations of the bounding area, spatial volume of the maximal slice, cosmological constant, and matter Hamiltonian. The total Hamiltonian is the generator of evolution along the conformal Killing vector that preserves the diamond. To interpret the first law as a thermodynamic relation, it appears necessary to attribute a negative temperature to the diamond, as has been previously suggested for the special case of the static patch of de Sitter spacetime. With quantum corrections included, for small diamonds we recover the "entanglement equilibrium" result that the generalized entropy is stationary at the maximally symmetric vacuum at fixed volume, and we reformulate this as the stationarity of free conformal energy with the volume not fixed. v3: 64 pages, 6 appendices, 8 figures; matches published version |
| Databáze: | OpenAIRE |
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