Cosmology with bulk viscosity and the gravitino problem

European Physical Journal C: Particles and Fields

L. Buoninfante¹  G. Lambiase¹ 

[1]Dipartimento di Fisica “E.R. Caianiello” Universitá di Salerno

关键词: Boltzmann Equation;    Cosmological Model;    Hubble Parameter;    Bulk Viscosity;    Standard Cosmological Model;   

DOI  :  10.1140/epjc/s10052-017-4840-7

来源: DOAJ

【 摘 要 】

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.

【 授权许可】

Unknown