2014/10/31 by Kyu Jung Bae, Howard Baer, Eung Jin Chun +1 · 1 citation
Physics and Astronomy · #Astrophysics #Axion #CMB cold spot #Cosmology #Cosmology and Gravitation Theories #Dark Matter and Cosmic Phenomena #Dark energy #Dark matter #Gravitino #Hot dark matter #Neutralino #Particle physics #Particle physics theoretical and experimental studies #Physics #Quantum mechanics #Supergravity #Supersymmetry #Warm dark matter #hep-ph
paper · pdf · doi:10.1103/physrevd.91.075011
published as Phys. Rev. D 91, 075011 (2015) · 38 pages with 11 figures, PRD accepted version
openalex publication_date 2015/04/14 · arxiv created 2015/04/17 · arxiv updated 2015/04/20 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We examine dark matter production rates in supersymmetric (SUSY) axion models typified by the mass hierarchy m3/2\ensuremath≪m(neutralino)\ensuremath≪m(axino). In such models, one expects the dark matter to be composed of an axion/gravitino admixture. After presenting motivation for how such a mass hierarchy might arise, we examine dark matter production in the SUSY Kim-Shifman-Vainshtein-Zakharov (KSVZ) model, the SUSY Dine-Fischler-Srednicki-Zhitnitsky (DFSZ) model and a hybrid model containing contributions from both KSVZ and DFSZ. Gravitinos can be produced thermally and also nonthermally from axino, saxion or neutralino decay. We obtain upper bounds on TR due to overproduction of gravitinos including both the thermal and nonthermal processes. For TR near the upper bound, dark matter tends to be gravitino dominated, but for TR well below the upper bounds, axion domination is more typical although in many cases we find a comparable mixture of both axions and gravitinos. In this class of models, we ultimately expect detection of relic axions but no weakly interacting massive particle signal, although SUSY should ultimately be discovered at colliders.