Fat brane, dark matter and localized kinetic terms in six dimensions

TL;DR

This paper explores a six-dimensional model with extra dimensions where dark matter interacts with Standard Model particles via a gauge mediator, using brane-localized kinetic terms and specific charge couplings to explain relic abundance.

Contribution

It introduces a novel six-dimensional setup with localized kinetic terms and specific charge couplings, providing a new mechanism for dark matter interactions and relic abundance.

Findings

Achieves observed dark matter relic density.

Avoids direct detection constraints for certain parameters.

Demonstrates the role of brane-localized kinetic terms in the model.

Abstract

Extra dimensions (ED) have been used as attempts to explain several phenomena in particle physics over the years. In this paper we investigate the role of an abelian gauge field as mediator of the interaction between dark matter (DM) and Standard Model (SM) particles, in a model with two flat and transverse ED compactified on the chiral square. DM is confined in a thin brane, localized at the origin of the chiral square, while the SM is localized in a finite width brane, lying in the opposite corner of the square. A brane-localized kinetic term is present in the DM brane, while in the fat brane it is not allowed. In this model the kinetic mixing is not required because we assume that the SM particles couple to the mediator through their $B-L$ charges, while DM couples to it via a dark charge. Assuming a complex scalar field as DM candidate it is possible to obtain the observed DM relic abundance and avoid direct detection constraints for some parameter choices.