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Self-interacting dark matter without prejudice
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The existence of dark matter particles that carry phenomenologically relevant self-interaction cross sections mediated by light dark sector states is considered to be severely constrained through a combination of experimental and observational data. The conclusion is based on the assumption of specific dark matter production mechanisms such as thermal freeze-out together with an extrapolation of a standard cosmological history beyond the epoch of primordial nucleosynthesis. In this work, we drop these assumptions and examine the scenario from the perspective of the current firm knowledge we have: results from direct and indirect dark matter searches and cosmological and astrophysical observations, without additional assumptions on dark matter genesis or the thermal state of the very early universe. We show that even in the minimal set-up, where dark matter particles self-interact via a kinetically mixed vector mediator, a significant amount of parameter space remains allowed. Interestingly, however, these parameter regions imply a meta-stable, light mediator, which in turn calls for modified search strategies.
Forward citations
Cited by 6 Pith papers
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Pion dark matter in a $\theta$ vacuum: a thermal relic with sharp velocity-dependent self-interactions
A QCD-like dark sector with a theta vacuum and a dark photon portal can simultaneously reproduce the dark matter relic abundance and produce the sharply velocity-dependent self-interactions inferred from small-scale s...
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Velocity-dependent self-interacting dark matter and composite Higgs
A composite Higgs model in which dark matter mass and a light scalar mediator both arise from hypercolor dynamics, giving velocity-dependent self-interacting dark matter with a claimed viable thermal relic.
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Meson spectroscopy in the $Sp(4)$ gauge theory with three antisymmetric fermions
Lattice simulations of Sp(4) with three antisymmetric Dirac fermions find QCD-like confinement and chiral symmetry breaking, and provide a first continuum-extrapolated meson spectrum.
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Probing Self-Interacting Dark Matter via Gravitational-Wave Background from Eccentric Supermassive Black Hole Mergers
Eccentric supermassive black hole binaries embedded in self-interacting dark matter produce a suppressed nanohertz gravitational-wave background, and current PTA data bound the cross section at sigma/mchi less than ab...
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Relaxing Constraints on Dark Matter Annihilation Near the Supermassive Black Hole in M87
For a Burkert cored M87 halo, the smooth halo, not the black hole density spike, controls the annihilation signal, so M87 constraints on dark matter annihilation weaken by orders of magnitude.
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