2020/11/30 by Michele Redi, Andrea Tesi, Hannah Tillim · 1 citation
Physics and Astronomy · #Cosmology and Gravitation Theories #Dark Matter and Cosmic Phenomena #Dark energy #Dark fluid #Dark matter #Galaxies: Formation, Evolution, Phenomena #Gravitation #Graviton #Hidden sector #Hot dark matter #Scalar field dark matter #astro-ph.CO #hep-ph #hep-th
paper · pdf · doi:10.1007/jhep05(2021)010
24 pages, 2 figures. v2) factor 2 fixed, references and clarifications added, results unchanged
openalex created_date 2020/12/07 · arxiv created 2021/03/16 · openalex publication_date 2021/05/03 · arxiv updated 2021/05/19 · openalex updated_date 2026/08/05
A bstract Dark sectors with purely gravitational couplings to the Standard Model are unavoidably populated from the SM plasma by graviton exchange, and naturally provide dark matter candidates. We examine the production in the relativistic regime where the dark sector is approximately scale invariant, providing general analytical formulas that depend solely on the central charge of the dark sector. We then assess the relevance of interactions that can lead to a variety of phenomena including thermalisation, non-perturbative mass gaps, out-of-equilibrium phase transitions and cannibalism in the dark sector. As an illustrative example we consider the dark glueball scenario in this light and show it to be a viable dark matter candidate due to the suppression of gravitational production. We go on to extend these results to strongly coupled CFTs and their holographic duals at large- N with the dark dilaton as the dark matter candidate.