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Gravitational SIMPs
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abstract
We study the impact of thermalization and number-changing processes in the dark sector on the yield of gravitationally produced dark matter (DM). We take into account the DM production through the $s$-channel exchange of a massless graviton both from the scattering of inflatons during the reheating era, and from the Standard Model bath via the UV freeze-in mechanism. By considering the DM to be a scalar, a fermion, and a vector boson we show, in a model-independent way, that DM self-interaction gives rise to a larger viable parameter space by allowing lower reheating temperature to be compatible with Planck observed relic abundance. As an example, we also discuss our findings in the ontext of the $\mathbb{Z}_2$-symmetric scalar singlet DM model.
Forward citations
Cited by 10 Pith papers
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Light PIDM in Warped Extra Dimensions
A UV-Dark-IR brane construction in warped 5D space allows light (MeV-TeV) purely gravitational dark matter to freeze in with TeV-scale reheating temperatures.
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Pseudo-FIMP dark matter in presence of a SIMP
A feebly interacting dark matter particle can become a pseudo-FIMP by staying in equilibrium through conversion with a strongly self-interacting SIMP partner; the paper demonstrates this with coupled Boltzmann equatio...
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Seesaw Cosmology
In seesaw reheating, the post-inflation universe can pass through four alternating matter/radiation eras, with the Standard Model temperature falling as a^{-1/4} and then a^{-3/8}, which changes dark-matter production.
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Baryon-dark matter coincidence in Randall-Sundrum Model
Graviton- and radion-mediated freeze-in in a Randall-Sundrum model can match the observed dark matter relic abundance, and TeV-scale resonant leptogenesis through the same portals can match the observed baryon asymmet...
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Constraining Gravitational Dark Matter with LHAASO and Fermi-LAT
Diffuse Galactic gamma-ray data strongly limit the couplings of gravitationally produced decaying dark matter, and the paper claims an oscillation-based bound on massive dark photons.
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Dark Matter Ultraviolet Freeze-in in General Reheating Scenarios
The paper derives analytic dark matter freeze-in yields for arbitrary power-law reheating histories and maps the gravitational production parameter space.
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Aspects of Gravitational Portals and Freeze-in during Reheating
During reheating, freeze-in from the gravitationally produced radiation bath can dominate the dark matter relic density for DM masses above the reheating temperature, with k- and n-dependent constraints.
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Preheating Axions in String Cosmology
Preheating of closed-string axions in fibre inflation can overproduce dark matter, yielding new upper bounds on the axion mass and constraints on model parameters.
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Relativistic accretion and burdened primordial black holes
Combining relativistic accretion with memory-burdened evaporation widens the parameter space for primordial black holes as dark matter and changes dark matter and dark radiation emission predictions.
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$Z'$-Mediated Dark Matter with Low-Temperature Reheating
Low-temperature reheating shifts the relic-density contours of Z'-mediated dark matter so that WIMP and FIMP solutions merge and new regions become testable.
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