Empirical three-parameter fit to f_esc(M_h,z) yields steep redshift evolution with population-averaged escape fraction rising from ~2% at z=5 to ~9% at z=12.
The Astrophysical Uncertainties Of Dark Matter Direct Detection Experiments
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abstract
The effects of astrophysical uncertainties on the exclusion limits at dark matter direct detection experiments are investigated for three scenarios: elastic, momentum dependent and inelastically scattering dark matter. We find that varying the dark matter galactic escape velocity and the Sun's circular velocity can lead to significant variations in the exclusion limits for light ($\lesssim10$ GeV) elastic and inelastic scattering dark matter. We also calculate the limits using one hundred velocity distributions extracted from the Via Lactea II and GHALO N-body simulations and find that a Maxwell-Boltzmann distribution with the same astrophysical parameters generally sets less constraining limits. The elastic and momentum dependent limits remain robust for masses $\gtrsim50$ GeV under variations of the astrophysical parameters and the form of the velocity distribution.
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Xenon data constrain inelastic fermion DM with scalar mediator for sub-MeV mass splittings through endothermic and exothermic DM-electron scattering.
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Steep Redshift Evolution of the Ionizing Escape Fraction at $z = 5$--$12$: Empirical Constraints and Comparison with Simulations
Empirical three-parameter fit to f_esc(M_h,z) yields steep redshift evolution with population-averaged escape fraction rising from ~2% at z=5 to ~9% at z=12.
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Direct-detection constraints on inelastic dark matter with a scalar mediator
Xenon data constrain inelastic fermion DM with scalar mediator for sub-MeV mass splittings through endothermic and exothermic DM-electron scattering.