Dark matter local density determination based on recent observations

Abstract

The local density of dark matter is an important quantity. On the one hand, its value is needed for dark matter direct detection searches. On the other hand, a precise and robust determination of the local dark matter density would help us learn about the shape of the dark matter halo of our Galaxy, which plays an important role in dark matter indirect detection searches, as well as in many studies in astrophysics and cosmology. There are different methods available to determine the local dark matter density. Among them, it is common to study either the vertical kinematics of a selected group of tracers or the rotation curve of the Milky Way. Recent estimates of the local dark matter density have used the precise observations conducted by the ESA/Gaia mission. However, in spite of the quality of the data released by Gaia's observations, different analyses of the local dark matter density produce dissimilar results. After a brief review of the most common methods to estimate the local density of dark matter, here we argue about different explanations for the discrepancies in the results of recent analyses. We finish by presenting new approaches that have been proposed in the literature and could help us improve our knowledge of this important quantity.

Probing dark photons with plasma haloscopes

“…Here, ρ ¼ 0.45 GeV=cm 3 is the local DM density (the value assumed in, e.g., Ref. [70] and compatible with observations [71][72][73]), V d is the fiducial volume of the detector, and κ is the signal coupling efficiency factor. In Appendix, we employ the machinery of thermal field theory to directly compute the power absorbed by the detector in the "propagator approach" [55].…”

Probing dark photons with plasma haloscopes

“…Ref. [63] and compatible with observations [64][65][66]), V d is the fiducial volume of the detector, and κ is the signal coupling efficiency factor.…”

Search for Dark Photon Dark Matter: Dark E-Field Radio Pilot Experiment

“…Evidence for the existence of dark matter was discovered via its gravitational effects on large scale dynamics, and new astronomical probes promise to establish additional constraints on its physical nature [14]. Astronomical observations [15,16] jointly give the energy density of dark matter, ρ DM , at our position in our Galaxy: 380±180 TeV/m 3 . For dark photons in free space, converting this energy density to its corresponding observed electric field gives [13]…”