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Solar Reflection of Dark Matter
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abstract
The scattering of light dark matter off thermal electrons inside the Sun produces a "fast" sub-component of the dark matter flux that may be detectable in underground experiments. We update and extend previous work by analyzing the signatures of dark matter candidates which scatter via light mediators. Using numerical simulations of the dark matter-electron interaction in the solar interior, we determine the energy spectrum of the reflected flux, and calculate the expected rates for direct detection experiments. We find that large Xenon-based experiments (such as XENON1T) provide the strongest direct limits for dark matter masses below a few MeV, reaching a sensitivity to the effective dark matter charge of better than $\sim 10^{-9}e$.
Forward citations
Cited by 8 Pith papers
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Solar Reflected Dark Matter under the Influence of a Dark Magnetic Field
For dark photon masses m_V ≲ 10⁻¹⁵ eV and dark matter masses m_χ ≲ 0.1 MeV, the solar dark magnetic field shields the core, weakening the solar-reflected dark matter reach of XENONnT and CDEX-10.
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First-principles upper bounds on dark matter-electron scattering rates from condensed matter sum rules
Dark matter-electron scattering rates in isotropic materials are bounded from above by a universal expression depending only on plasma frequency, mass density, and static dielectric function.
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Dark matter energy exchange in stars orbiting supermassive black holes
Orbit-averaged elastic DM scattering in S4714 reaches stellar luminosity at σ_χp ∼ 10^{-36} cm² (MeV–GeV) and σ_χe ∼ 5×10^{-38} cm² (sub-MeV) for a spiked profile.
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SENSEI: A Search for Diurnal Modulation in sub-GeV Dark Matter Scattering
No sidereal daily modulation is seen in SENSEI single-electron data; the 90% C.L. amplitude bound is 6.8 e−/g/day and sub-MeV dark-matter cross-section limits improve by about an order of magnitude.
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New Thermal-Relic Targets for sub-GeV Dark Matter Direct Detection
For sub-GeV dark matter coupled to anomaly-free U(1) mediators, thermal freeze-out predicts electron-recoil cross sections that are already excluded for electrophilic mediators but still viable and discoverable for el...
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Dark Secrets of Baryons: Illuminating Dark Matter-Baryon Interactions with JWST
JWST ultraviolet luminosity function data currently provide the strongest upper limits on velocity-dependent (∝v^{-2}) dark matter–proton scattering for sub-GeV dark matter.
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Study of sub-GeV Dipolar Dark States at SND@LHC within Invisible Bounds on Meson Decays
SND@LHC could probe sub-GeV dark matter with electric/magnetic dipole moments in parts of parameter space not yet excluded, especially around 0.5 MeV in HL-LHC, but existing LEP and CHARM II bounds remain tighter in m...
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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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