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Title: Direct detection rates of dark matter coupled to dark energy

Abstract

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 {radical}(1+{kappa}{sup 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}{sup 2}, which, for sufficiently massive WIMPs, allows the possibility of designing experiments measuring {gamma} rays following nuclear de-excitation.

Authors:
 [1];  [2];  [3];  [4]
  1. Department of Physics, University of Athens, Zographou 157 84 (Greece)
  2. Theoretical Physics Division, University of Ioannina, Ioannina, Gr 451 10 (Greece)
  3. (Germany)
  4. Institute of Theoretical Physics, University of Tuebingen, Tuebingen (Germany)
Publication Date:
OSTI Identifier:
20935206
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review. D, Particles Fields; Journal Volume: 75; Journal Issue: 2; Other Information: DOI: 10.1103/PhysRevD.75.023504; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; AMPLITUDES; BOLTZMANN EQUATION; BOLTZMANN STATISTICS; DE-EXCITATION; GALAXIES; GAMMA RADIATION; GEV RANGE 100-1000; GRAVITATION; MASS; NONLUMINOUS MATTER; TIME DEPENDENCE

Citation Formats

Tetradis, N., Vergados, J. D., Institute of Theoretical Physics, University of Tuebingen, Tuebingen, and Faessler, Amand. Direct detection rates of dark matter coupled to dark energy. United States: N. p., 2007. Web. doi:10.1103/PHYSREVD.75.023504.
Tetradis, N., Vergados, J. D., Institute of Theoretical Physics, University of Tuebingen, Tuebingen, & Faessler, Amand. Direct detection rates of dark matter coupled to dark energy. United States. doi:10.1103/PHYSREVD.75.023504.
Tetradis, N., Vergados, J. D., Institute of Theoretical Physics, University of Tuebingen, Tuebingen, and Faessler, Amand. Mon . "Direct detection rates of dark matter coupled to dark energy". United States. doi:10.1103/PHYSREVD.75.023504.
@article{osti_20935206,
title = {Direct detection rates of dark matter coupled to dark energy},
author = {Tetradis, N. and Vergados, J. D. and Institute of Theoretical Physics, University of Tuebingen, Tuebingen and Faessler, Amand},
abstractNote = {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 {radical}(1+{kappa}{sup 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}{sup 2}, which, for sufficiently massive WIMPs, allows the possibility of designing experiments measuring {gamma} rays following nuclear de-excitation.},
doi = {10.1103/PHYSREVD.75.023504},
journal = {Physical Review. D, Particles Fields},
number = 2,
volume = 75,
place = {United States},
year = {Mon Jan 15 00:00:00 EST 2007},
month = {Mon Jan 15 00:00:00 EST 2007}
}