Nonthermal production of dark radiation and dark matter

Abstract

Dark matter may be coupled to dark radiation: light degrees of freedom that mediate forces between dark sector particles. Cosmological constraints favor dark radiation that is colder than Standard Model radiation. In models with fixed couplings between dark matter and the Standard Model, these constraints can be difficult to satisfy if thermal equilibrium is assumed in the early universe. We construct a model of asymmetric reheating of the visible and dark sectors from late decays of a long-lived particle (for instance, a modulus). We show, as a proof-of-principle, that such a model can populate a sufficiently cold dark sector while also generating baryon and dark matter asymmetries through the out of equilibrium decay. We frame much of our discussion in terms of the scenario of dissipative dark matter, as in the Double-Disk Dark Matter scenario. However, our results may also be of interest for other scenarios like the Twin Higgs model that are in danger of overproducing dark radiation due to nonnegligible dark-visible couplings.

v2: accepted by JHEP; added discussion of baryon violation constraints, some corrections

References in corpus (20)

• Leptogenesis
• Dark Matter and Dark Radiation
• Non-relativistic effective theory of dark matter direct detection
• Neutralino with the Right Cold Dark Matter Abundance in (Almost) Any Supersymmetric Model
• Thin, thick and dark discs in LCDM
• A Supersymmetric Twin Higgs
• Scattering, Damping, and Acoustic Oscillations: Simulating the Structure of Dark Matter Halos with Relativistic Force Carriers
• Cladogenesis: Baryon-Dark Matter Coincidence from Branchings in Moduli Decay
• Detecting the Milky Way's Dark Disk
• Dark Matter as a Trigger for Periodic Comet Impacts
• Light Dark Matter, Naturalness, and the Radiative Origin of the Electroweak Scale
• Model Independent Direct Detection Analyses
• Signals from dark atom formation in halos
• Discriminating dark matter candidates using direct detection
• Updated Kinematic Constraints on a Dark Disk
• Interstellar Gas and a Dark Disk
• Confronting the Moduli-Induced LSP Problem
• Natural Supersymmetry in Warped Space
• Supersymmetric Partially Interacting Dark Matter
• Implications Of A Dark Sector U(1) For Gamma Ray Bursts

Cited by in corpus (20)

• Dark Matter Self-interactions and Small Scale Structure
• The First Three Seconds: a Review of Possible Expansion Histories of the Early Universe
• A New Target for Cosmic Axion Searches
• Thermal Dark Matter From A Highly Decoupled Sector
• Chilly Dark Sectors and Asymmetric Reheating
• Using Gaia DR2 to Constrain Local Dark Matter Density and Thin Dark Disk
• Recovering a MOND-like acceleration law in mimetic gravity
• Non-Abelian Dark Forces and the Relic Densities of Dark Glueballs
• Cosmological Signals of a Mirror Twin Higgs
• (Non-)thermal production of WIMPs during kination
• Cooling in a Dissipative Dark Sector
• Categorisation and Detection of Dark Matter Candidates from String/M-theory Hidden Sectors
• WIMPs with GUTs: Dark Matter Coannihilation with a Lighter Species
• Direct Detection of Atomic Dark Matter in White Dwarfs
• Point Sources from Dissipative Dark Matter
• Sterile Neutrino Dark Matter with Supersymmetry
• Reheating in two-sector cosmology
• Non-thermal neutrino-like hot dark matter in light of the $S_8$ tension
• Twin Quark Dark Matter From Cogenesis
• Accretion of Dissipative Dark Matter onto Active Galactic Nuclei