Cosmology with bulk viscosity and the gravitino problem

Autor:	L. Buoninfante, G. Lambiase
Jazyk:	angličtina
Rok vydání:	2017
Předmět:	Boltzmann Equation Cosmological Model Hubble Parameter Bulk Viscosity Standard Cosmological Model Astrophysics QB460-466 Nuclear and particle physics. Atomic energy. Radioactivity QC770-798
Zdroj:	European Physical Journal C: Particles and Fields, Vol 77, Iss 5, Pp 1-7 (2017)
Druh dokumentu:	article
ISSN:	1434-6044 1434-6052
DOI:	10.1140/epjc/s10052-017-4840-7
Popis:	Abstract The gravitino problem is revisited in the framework of cosmological models in which the primordial cosmic matter is described by a relativistic imperfect fluid. Dissipative effects (or bulk viscosity effects) arise owing to the different cooling rates of the fluid components. We show that the effects of the bulk viscosity allow one to avoid the late abundance of gravitinos. In particular, for particular values of the parameters characterizing the cosmological model, the gravitino abundance turns out to be weakly depending on the reheating temperature.
Databáze:	Directory of Open Access Journals
Externí odkaz:	https://doaj.org/article/d5d2bc34a89540209598155612c28bf2 Zobrazit plný text záznamu View record in DOAJ Plný text ve formátu PDF