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Observationally Inferred Dark Matter Phase-space Distribution and Direct Detection Experiments by Mandal, Sayan; Majumdar, Subhabrata; Rentala, Vikram; Thakur, Ritoban Basu is a scholarly article available to read on EtoBox.

What is Observationally Inferred Dark Matter Phase-space Distribution and Direct Detection Experiments about?

We present a detailed analysis of the effect of an observationally determined dark matter (DM) velocity distribution function (VDF) of the Milky Way (MW) on DM direct detection rates. We go beyond local kinematic tracers and use rotation curve data up to 200 kpc to construct a MW mass model and self-consistently determine the local phase-space distribution of DM. This approach mitigates any incomplete understanding of local dark matter-visible matter degeneracies that can affect the determination of the VDF. Comparing with the oft used Standard Halo Model (SHM), which assumes an isothermal VDF, we look at how the tail of the empirically determined VDF alters our interpretation of the present direct detection WIMP DM cross section exclusion limits. While previous studies have suggested a very large difference (of more than an order of magnitude) in the bounds at low DM masses, we show that accounting for the detector response at low threshold energies, the difference is still significant although less extreme. The change in the number of signal events, when using the empirically determined DM VDF in contrast to the SHM VDF, is most prominent for low DM masses for which the shape of

Author

Mandal, Sayan; Majumdar, Subhabrata; Rentala, Vikram; Thakur, Ritoban Basu

Published

2018

Language

EN