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Phys. Rev. Lett. 89, 211301 (2002) [4 pages]

Kaluza-Klein Dark Matter

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Hsin-Chia Cheng1, Jonathan L. Feng2, and Konstantin T. Matchev3,4
1Enrico Fermi Institute, The University of Chicago, Chicago, Illinois 60637
2Department of Physics and Astronomy, University of California, Irvine, California 92697
3Department of Physics, University of Florida, Gainesville, Florida 32611
4Theory Division, CERN, CH-1211 Geneva, Switzerland

Received 12 July 2002; revised 10 September 2002; published 30 October 2002

See accompanying Physics Focus

We propose that cold dark matter is made of Kaluza-Klein particles and explore avenues for its detection. The lightest Kaluza-Klein state is an excellent dark matter candidate if standard model particles propagate in extra dimensions and Kaluza-Klein parity is conserved. We consider Kaluza-Klein gauge bosons. In sharp contrast to the case of supersymmetric dark matter, these annihilate to hard positrons, neutrinos, and photons with unsuppressed rates. Direct detection signals are also promising. These conclusions are generic to bosonic dark matter candidates.

© 2002 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.89.211301
DOI:
10.1103/PhysRevLett.89.211301
PACS:
95.35.+d, 11.10.Kk, 12.60.–i
 
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