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Optimal Celestial Bodies for Dark Matter Detection
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A wide variety of celestial bodies have been considered as dark matter detectors. Which stands the best chance of delivering the discovery of dark matter? Which is the most powerful dark matter detector? We investigate a range of objects, including the Sun, Earth, Jupiter, Brown Dwarfs, White Dwarfs, Neutron Stars, Stellar populations, and Exoplanets. We quantify how different objects are optimal dark matter detectors in different regimes by deconstructing some of the in-built assumptions in these search sensitivities, including observation potential and particle model assumptions. We find new constraints and future sensitivities across a range of dark matter annihilation final states. We quantify mediator properties leading to detectable celestial-body energy injection or Standard Model fluxes, and show how different objects can be expected to deliver corroborating signals. We discuss different search strategies, their opportunities and limitations, and the interplay of regimes where different celestial objects are optimal dark matter detectors. Deconstructing the assumptions of these searches leads us to point out a new search using the Galactic center stellar population that can provide greater sensitivity to the dark matter-nucleon scattering cross section than the Sun, despite being significantly further away in our Galaxy.
Forward citations
Cited by 7 Pith papers
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Dark matter capture onto neutron stars is amplified by about 4-5 times in circular binaries, tightening cross-section limits from GW170817 and capping the accreted DM fraction near 1e-3.
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Complementary Planetary Spectroscopy Probes of Dark Matter
Dark matter annihilation energy deposited in planetary atmospheres and interiors, compared against existing UV airglow and heat flow measurements, yields new sub-GeV scattering constraints and long-lived mediator reach.
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Can a Dark Inferno Melt Earth's Core?
Dark matter annihilation inside Earth would melt a substantial fraction of the inner core for cross sections previously allowed by surface heat-flow limits.
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Asteroseismological constraints on--and hints of--dark matter interactions
Dark matter heat transport can erase convective cores in solar-mass stars, yielding asteroseismic constraints on dark matter-nucleon scattering and a 4 sigma hint of dark matter-electron scattering in KIC 8228742 that...
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Searching for dark matter annihilating into light long-lived mediators from stars inside dwarf spheroidal galaxies
Fermi-LAT observations of ten dwarf spheroidals place upper limits on dark matter-nucleon scattering by modeling stellar capture and annihilation through long-lived mediators.
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Impact of Sub-MeV Dark Matter on the Cooling of Pulsating White Dwarfs
Sub-MeV dark matter scattering, capture, and evaporation remove at most about 1e22 erg/s from the pulsating white dwarf G117-B15A, too little to explain its excess cooling, while Galactic Center white dwarfs could pro...
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