Direct Detection Rates of Dark Matter Coupled to Dark Energy

Details Direct Detection Rates of Dark Matter Coupled to Dark Energy Direct Detection Rates of Dark Matter Coupled to Dark Energy

2006-09-07

arxiv.org/abs/hep-ph/0609078v2

Phys.Rev.D75:023504,2007

Physics

High Energy Physics

High Energy Physics - Phenomenology

16 pages, 7 figures

Scientific paper

10.1103/PhysRevD.75.023504

We investigate the effect of a coupling between dark matter and dark energy on the rates for the direct detection of dark matter. The magnitude of the effect depends on the strength $\kappa$ of this new interaction relative to gravity. The resulting isothermal velocity distribution for dark matter in galaxy halos is still Maxwell-Boltzmann (M-B), but the characteristic velocity and the escape velocity are increased by $\sqrt{1+\kappa^2}$. We adopt a phenomenological approach and consider values of $\kappa$ near unity. For such values we find that: (i) The (time averaged) event rate increases for light WIMPs, while it is somewhat reduced for WIMP masses larger than 100 GeV. (ii) The time dependence of the rate arising from the modulation amplitude is decreased compared to the standard M-B velocity distribution. (iii) The average and maximum WIMP energy increase proportionally to $1+\kappa^2$, which, for sufficiently massive WIMPs, allows the possibility of designing experiments measuring $\gamma$ rays following nuclear de-excitation.

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