The PAMELA and Fermi signals from long-lived Kaluza-Klein dark matter

Details The PAMELA and Fermi signals from long-lived Kaluza-Klein dark matter The PAMELA and Fermi signals from long-lived Kaluza-Klein dark matter

2009-05-18

arxiv.org/abs/0905.2801v3

Phys.Rev.D80:075010,2009

Physics

High Energy Physics

High Energy Physics - Phenomenology

9 pages, no figure

Scientific paper

10.1103/PhysRevD.80.075010

We propose a simple extension of the minimal universal extra dimension (UED)model by introducing a small curvature. The model is formulated as a small anti-de Sitter curvature limit of the five-dimensional standard model (SM) in the Randall-Sundrum background geometry. While the lightest Kaluza-Klein (KK) particle can be thermal relic dark matter as usual in the UED model, the KK-parity is explicitly broken in the presence of the small curvature and the KK dark matter decays into the SM fermions with a long lifetime. Couplings of the KK dark matter with SM fermion pairs in the five dimensional bulk are controlled by fermion bulk masses. With a suitable choice of bulk masses for leptons and quarks, the KK dark matter through its decay into leptons can account for the cosmic-ray electron/positron excesses reported by the recent PAMELA and FERMI satellite experiments, while suppressing the decay into quarks.

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