Case for decaying spin-3/2 dark matter

2020/06/30 by Marcos A. G. Garcia, Marcos A. G. García, Yann Mambrini +2 · 34 citations
Physics and Astronomy · #Atomic and Subatomic Physics Research #Computer science #Dark Matter and Cosmic Phenomena #Particle physics theoretical and experimental studies #astro-ph.CO #astro-ph.HE #hep-ph #hep-th

paper · pdf · doi:10.1103/physrevd.102.083533

published in Physical review. D/Physical review. D. 102(8) (American Physical Society) · 20 pages, 13 figures. v3: matches published version

openalex created_date 2020/06/12 · openalex publication_date 2020/10/23 · arxiv created 2020/10/26 · arxiv updated 2020/10/28 · openalex updated_date 2026/08/05

Abstract

We consider a spin-3/2 particle and show that with a Planck reduced coupling, we can obtain a sufficiently long lifetime making the spin-3/2 particle a good dark matter candidate. We show that this dark matter candidate can be produced during inflationary reheating through the scattering of Standard Model particles. The relic abundance as determined by Planck and other experimental measurements is attained for reasonable values of the reheating temperature T_RH\ensuremath\gtrsim10⁸ GeV. We consider two possible gauge invariant couplings to the extended Standard Model. We find a large range of masses are possible which respect the experimental limits on its decay rate. We expect smoking-gun signals in the form of a monochromatic photon with a possible monochromatic neutrino, which can be probed in the near future in IceCube and other indirect detection experiments.

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