Extra-dimensional model of dark matter

We present a model for dark matter with extra spatial dimensions in which Standard-Model (SM) fermions have localized wave functions. The underlying gauge group is GSM circle times U(1)z, and the dark matter particle is a SM-singlet Dirac fermion, chi, which is charged under the U(1)z gauge symmetry. We show that the conventional wisdom that the mass of a Dirac fermion is naturally at the ultraviolet cutoff scale does not hold in this model. We further demonstrate that this model yields a dark matter relic abundance in agreement with observation and discuss constraints from direct and indirect searches for dark matter. The dark matter particle interacts weakly with matter and has negligibly small self-interactions. Very good fits to data from cosmological observations and experimental dark matter searches are obtained with m chi in the multi-TeV range. A discussion is given of observational signatures and experimental tests of the model.

Automated summary

This model proposes the existence of dark matter with extra spatial dimensions, with Standard-Model fermions having localized wave functions. The dark matter particle is a SM-singlet Dirac fermion charged under a U(1)z gauge symmetry. Contrary to conventional wisdom, the mass of the Dirac fermion in this model is not naturally at the ultraviolet cutoff scale. The model predicts dark matter relic abundance in agreement with observation, with the dark matter particle weakly interacting with matter and having negligibly small self-interactions.