Abstract
The dark matter direct detection rates are highly correlated with the phase space distribution of dark matter particles in our galactic neighbourhood. In this paper we make a systematic study of the impact of astrophysical uncertainties on electron recoil events at the direct detection experiments with Xenon and semiconductor detectors. We find that within the standard halo model there can be up to sim 50% deviation from the fiducial choice in the exclusion bounds from these observational uncertainties. For non-standard halo models we report a similar deviation from the fiducial standard halo model when fitted with recent cosmological N-body simulations while even larger deviations are obtained in case of the observational uncertainties.
Highlights
In the last few decades particulate dark matter (DM) has been probed by its possible scattering with the Standard Model (SM) particles [1,2,3,4,5]
In the lower panel we show the deviation from the fiducial Standard Halo Model (SHM) for FDM = 1, the light blue bands arise due the uncertainties related to the measurement of vesc and v0
The non-observation of DM in the typical nuclear recoil direct detection experiments and the inability of GeV scale cold DM to address certain small scale structure formation issues have increased the interest in sub-GeV scale DM
Summary
In the last few decades particulate dark matter (DM) has been probed by its possible scattering with the Standard Model (SM) particles [1,2,3,4,5]. Cosmological N -body simulations generate a patch of our local universe containing mostly DM particles and in some cases stars and gas to study and compare our local universe including the Milky Way (MW) galaxy and its halo to the present day observations. They usually include the effect of baryons utilizing hydrodynamic simulation. Modifications of the SHM framework have been introduced to reconcile the astrophysical observations and cosmological simulations [18,19,20,21] These include the King velocity distribution determines the cut off in the distribution through a self consistent manner [22].
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