A Dark Matter Candidate from an Extra (Non-Universal) Dimension

Details A Dark Matter Candidate from an Extra (Non-Universal) Dimension A Dark Matter Candidate from an Extra (Non-Universal) Dimension

2006-12-21

arxiv.org/abs/hep-ph/0612286v2

JHEP 0703:084,2007

Physics

High Energy Physics

High Energy Physics - Phenomenology

26 pages, 10 figures; v2: fig.1 corrected, one reference and some comments added, conclusions unchanged. Version to appear in

Scientific paper

10.1088/1126-6708/2007/03/084

We show that a recently constructed five-dimensional (5D) model with gauge-Higgs unification and explicit Lorentz symmetry breaking in the bulk, provides a natural dark matter candidate. This is the lightest Kaluza-Klein particle odd under a certain discrete Z_2 symmetry, which has been introduced to improve the naturalness of the model, and resembles KK-parity but is less constraining. The dark matter candidate is the first KK mode of a 5D gauge field and electroweak bounds force its mass above the TeV scale. Its pair annihilation rate is too small to guarantee the correct relic abundance; however coannihilations with colored particles greatly enhance the effective annihilation rate, leading to realistic relic densities.

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