FIMP Dark Matter in Clockwork/Linear Dilaton extra-dimensions

We study the possibility that Dark Matter (DM) is made of Feebly Interacting Massive Particles (FIMP) interacting just gravitationally with the Standard Model particles in the framework of a Clockwork/Linear Dilaton (CW/LD) model. We restrict here to the case in which the DM particles are scalar fields. This paper extends our previous study of FIMP's in Randall-Sundrum (RS) warped extra-dimensions. As it was the case in the RS scenario, also in the CW/LD model we find a significant region of the parameter space in which the observed DM relic abundance can be reproduced with scalar DM mass in the MeV range, with a reheating temperature varying from 10 GeV to 10(9) GeV. We comment on the similarities of the results in both extra-dimensional models.

Automated summary

This study explores the possibility of Dark Matter being made of Feebly Interacting Massive Particles interacting gravitationally with Standard Model particles in the Clockwork/Linear Dilaton (CW/LD) model. The study concludes that a significant region of parameter space in the CW/LD model can reproduce the observed Dark Matter relic abundance with scalar DM mass in the MeV range, similar to the results in the Randall-Sundrum (RS) scenario.