Abstract
In this paper we analyze a dark matter model inspired by theories with extra dimensions. The dark matter candidate corresponds to the first Kaluza–Klein mode of an real scalar added to the Standard Model. The tower of new particles enriches the calculation of the relic abundance. For large mass splitting, the model converges to the predictions of the inert singlet dark matter model. For nearly degenerate mass spectrum, coannihilations increase the cross-sections used for direct and indirect dark matter searches. Moreover, the Kaluza–Klein zero mode can mix with the SM higgs and further constraints can be applied.
Highlights
In this paper we analyze a dark matter model inspired by theories with extra dimensions
2.1 General aspects of extra dimensions One of the main motivations for the interest in extra dimensional models comes from the possibility to address in an alternative way the hierarchy problem of the standard model of particle physics [10, 12, 13]
In the course of their development extra dimensional theories have shown that they can address others problems in particle physics such as symmetry breaking [34], mass and mixing of fermions [35], and they can provide a natural candidate to dark matter [18]
Summary
In the course of their development extra dimensional theories have shown that they can address others problems in particle physics such as symmetry breaking [34], mass and mixing of fermions [35], and they can provide a natural candidate to dark matter [18] They may modify the evolution of the Universe [36]. One important aspect of the compactification is related to the presence of boundary localized terms (BLT) These terms arise as a consequence of the boundary conditions imposed on the geometry of the inner space and could be generated by radiative corrections. These terms modify the Kaluza-Klein spectrum as well as the interactions among the particles This kind of compactification is important to obtain chiral fermions in 4-dimensions from a 5-dimensional theory [41]2. It seems that after compactification a U(1) symmetry remains to stabilize the first Kaluza-Klein particle that is our dark matter candidate
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