Quantum field corrections to the equation of state of freely streaming matter in the Friedman-Lemaitre-Robertson-Walker space-time

Autor:	Becattini, F., Roselli, D.
Rok vydání:	2022
Předmět:	General Relativity and Quantum Cosmology Astrophysics - Cosmology and Nongalactic Astrophysics Condensed Matter - Statistical Mechanics
Druh dokumentu:	Working Paper
DOI:	10.1088/1361-6382/ace495
Popis:	We calculate the energy density and pressure of a scalar field after its decoupling from a thermal bath in the spatially flat Friedman-Lema\^itre-Robertson-Walker space-time, within the framework of quantum statistical mechanics. By using the density operator determined by the condition of local thermodynamic equilibrium, we calculate the mean value of the stress-energy tensor of a real scalar field by subtracting the vacuum expectation value at the time of the decoupling. The obtained expressions of energy density and pressure involve corrections with respect to the classical free-streaming solution of the relativistic Boltzmann equation, which may become relevant even at long times. Comment: 18 pages, 1 figure; finally published version
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/2212.05518 Zobrazit plný text záznamu View this record from Arxiv