Gravitino/Axino as Decaying Dark Matter and Cosmological Tensions
arXiv:1705.04521 · doi:10.1016/j.physletb.2017.06.071
Abstract
In supersymmetric axion models, if the gravitino or axino is the lightest SUSY particle (LSP), the other is often the next-to-LSP (NLSP). We investigate the cosmology of such a scenario and point out that the lifetime of the NLSP naturally becomes comparable to the present age of the universe in a viable parameter region. This is a well-motivated example of the so-called decaying dark matter model, which is recently considered as an extension of the $Î$CDM model to relax some cosmological tensions.
16 pages, 2 figures, Journal version