Is the Lightest Kaluza-Klein Particle a Viable Dark Matter Candidate?

By G. Servant, T. Tait. 2002

781 citations recorded by the source corpus.

Abstract In models with universal extra dimensions (i.e., in which all Standard Model fields, including fermions, propagate into compact extra dimensions) momentum conservation in the extra dimensions leads to the conservation of Kaluza–Klein (KK) number at each vertex. KK number is violated by loop effects because of the orbifold imposed to reproduce the chiral Standard Model with zero modes, however, a KK parity remains at any order in perturbation theory which leads to the existence of a stable lightest KK particle (LKP). In addition, the degeneracy in the KK spectrum is lifted by radiative corrections so that all other KK particles eventually decay into the LKP. We investigate cases where the Standard Model lives in five or six dimensions with compactification radius of TeV−1 size and the LKP is the first massive state in the KK tower of either the photon or the neutrino. We derive the relic density of the LKP under a variety of assumptions about the spectrum of first tier KK modes. We find that both the KK photon and the KK neutrino, with masses at the TeV scale, may have appropriate annihilation cross sections to account for the dark matter, Ω M ∼0.3 .

Subfields: Artificial Intelligence, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/c632d24429c0064ed66802bab3b32a3e3e18bd0c

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Citations in the corpus

TeV symmetry and the little hierarchy problem (2003, neutral): “2 TeV [38], which is consistent with the little Higgs model.”
Dark matter and fundamental physics with the Cherenkov Telescope Array (2012, background): “Natural WIMP candidates are found in proposed extensions of the SM, e.g. in Super-Symmetry (SUSY) [19, 20], but also Little Higgs [21], Universal Extra Dimensions [22], and Technicolor models [23, 24], among others.”
Dark Matter through the Higgs portal (2019, background): “It is extremely tempting and, in fact, rather natural to consider that (1)The two other theoretical constructions that address the problem of the hierarchy of scales in the SM Higgs sector, namely extra space–time dimensions and composite models have also their DM candidates, respectively, the light”
Light dark matter and Z′ dark force at colliders (2012, background): “such as the LSP dark matter of supersymmetry [7, 8] or KK dark matter of models with extradimension(s) [9, 10].”