Related papers: Quantum thermodynamics of de Sitter space

Quantum thermodynamics of de Sitter space

URL: http://arxiv.org/abs/2307.04800v3
Date: Tue, 12 Dec 2023 15:42:23 GMT
Title: Quantum thermodynamics of de Sitter space
Authors: Robert Alicki, Gabriela Barenboim and Alejandro Jenkins
Abstract summary: We consider the local physics of an open quantum system embedded in an expanding three-dimensional space. For a de Sitter space with Hubble parameter $h = $ const., the background fields act as a physical heat bath.
Score: 49.1574468325115
License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Abstract: We consider the local physics of an open quantum system embedded in an expanding three-dimensional space $\mathbf x$, evolving in cosmological time $t$, weakly coupled to a massless quantum field. We derive the corresponding Markovian master equation for the system's nonunitary evolution and show that, for a de Sitter space with Hubble parameter $h = $ const., the background fields act as a physical heat bath with temperature $T_{\rm dS} = h / 2 \pi$. The energy density of this bath obeys the Stefan-Boltzmann law $\rho_{\rm dS} \propto h^4$. We comment on how these results clarify the thermodynamics of de Sitter space and support previous arguments for its instability in the infrared. The cosmological implications are considered in an accompanying letter.

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