Probing Non-Thermal Gravitinos Through Large-Scale Structure Observations

2024/08/20 by Deng, Weiyi, Guo, Liyuan, Han, Chengcheng +1
#Cosmology and Nongalactic Astrophysics (astro-ph.CO) #FOS: Physical sciences #General Relativity and Quantum Cosmology (gr-qc) #High Energy Physics - Phenomenology (hep-ph)

paper · doi:10.48550/arxiv.2408.10585

Abstract

We investigate the effects of non-thermally produced dark matter on large-scale structure formation, focusing on the gravitino dark matter. Our analysis shows that large-scale structure measurements from the SDSS LRG data offer a promising approach to probing non-thermally produced gravitinos. Specifically, if gravitinos resulting from neutralino decay constitute a fraction F_dec=0.35~(0.1) of the dark matter component, the data exclude bino-like neutralino with a mass m_χ1⁰\lesssim 25~(11) GeV at 95% C.L.. Furthermore, this constraint appears to be largely independent of the gravitino mass.

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