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Resonant or asymmetric: The status of sub-GeV dark matter
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Sub-GeV dark matter (DM) particles produced via thermal freeze-out evade many of the strong constraints on heavier DM candidates but at the same time face a multitude of new constraints from laboratory experiments, astrophysical observations and cosmological data. In this work we combine all of these constraints in order to perform frequentist and Bayesian global analyses of fermionic and scalar sub-GeV DM coupled to a dark photon with kinetic mixing. For fermionic DM, we find viable parameter regions close to the dark photon resonance, which expand significantly when including a particle-antiparticle asymmetry. For scalar DM, the velocity-dependent annihilation cross section evades the strongest constraints even in the symmetric case. Using Bayesian model comparison, we show that both asymmetric fermionic DM and symmetric scalar DM are preferred over symmetric fermionic DM due to the reduced fine-tuning penalty. Finally, we explore the discovery prospects of near-future experiments both in the full parameter space and for specific benchmark points. We find that the most commonly used benchmark scenarios are already in tension with existing constraints and propose a new benchmark point that can be targeted with future searches.
Forward citations
Cited by 8 Pith papers
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Spin-Dependent Scattering of Sub-GeV Dark Matter: Models and Constraints
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A sub-GeV vector DM model with a magnetic dipole portal is studied at LDMX/NA64, but the claimed viable region relies on an unjustified thermal equilibrium assumption.
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Direct Detection of Leptophobic Dark Matter with Electronic Collective Excitations
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Molecular clouds constraints on sub-GeV DM and asteroid-mass PBHs
Molecular-cloud ionization yields competitive constraints on sub-GeV dark matter annihilation/decay and on asteroid-mass primordial black holes, particularly for PBHs above 10^16 g.
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Probing Light Dark Particles in Neutrino Scattering Experiments
A dark fermion produced in neutrino scattering could be probed at DUNE's near detector up to cutoff scales near 1 TeV, beyond CHARM II and LEP, while current COHERENT/CONUS+ limits stay below LHC bounds.
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Relaxed constraints for dark matter with axial coupling to a dark photon
Axial coupling of Dirac dark matter to a kinetically-mixed dark photon suppresses the standard direct-detection signal and opens large allowed regions in the WIMP parameter space.
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Sub-GeV Dark Matter Under Pressure from Direct Detection
PandaX-4T S2-only data yields world-leading sub-GeV dark matter-electron scattering limits for heavy mediators in the 20-200 MeV range, although the result largely overlaps with the collaboration's own just-released analysis.
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