Plasma dark matter direct detection

Abstract

Dark matter in spiral galaxies like the Milky Way may take the form of a dark plasma. Hidden sector dark matter charged under an unbroken $U(1{)}^{\prime }$ gauge interaction provides a simple and well defined particle physics model realising this possibility. The assumed $U(1{)}^{\prime }$ neutrality of the Universe then implies (at least) two oppositely charged dark matter components with self-interactions mediated via a massless "dark photon" (the $U(1{)}^{\prime }$ gauge boson). In addition to nuclear recoils such dark matter can give rise to keV electron recoils in direct detection experiments. In this context, the detailed physical properties of the dark matter plasma interacting with the Earth is required. This is a complex system, which is here modelled as a fluid governed by the magnetohydrodynamic equations. These equations are numerically solved for some illustrative examples, and implications for direct detection experiments discussed. In particular, the analysis presented here leaves open the intriguing possibility that the DAMA annual modulation signal is due primarily to electron recoils (or even a combination of electron recoils and nuclear recoils). The importance of diurnal modulation (in addition to annual modulation) as a means of probing this kind of dark matter is also emphasised.

34 pages, 11 figures

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Cited by in corpus (12)

• Solving the small-scale structure puzzles with dissipative dark matter
• Earth-Scattering of super-heavy Dark Matter: updated constraints from detectors old and new
• Dark Matter and the XENON1T electron recoil excess
• Robust Constraints and Novel Gamma-Ray Signatures of Dark Matter That Interacts Strongly With Nucleons
• Search for annual and diurnal rate modulations in the LUX experiment
• Comprehensive asymmetric dark matter model
• Long range dark matter self-interactions and plasma instabilities
• First direct detection constraint on mirror dark matter kinetic mixing using LUX 2013 data
• Dissipative dark matter halos: The steady state solution II
• Resolution of the small scale structure issues with dissipative dark matter from multiple Standard Model sectors
• Testing merging of Dark Exotic Stars from Gravitational Waves in the Multi-messenger approach
• DAMA annual modulation is not due to electron recoils from Plasma/Mirror Dark Matter with Kinetic Mixing