FIMP Dark Matter in Clockwork/Linear Dilaton Extra-Dimensions

TL;DR

This paper explores the viability of scalar FIMP dark matter within Clockwork/Linear Dilaton extra-dimensional models, demonstrating that such particles can account for observed relic abundance across a broad parameter space.

Contribution

It extends previous FIMP studies from Randall-Sundrum models to CW/LD models, identifying parameter regions compatible with dark matter observations.

Findings

Scalar FIMP DM can reproduce relic abundance in CW/LD models.

Viable DM mass range is in the MeV scale.

Reheating temperature can vary from 10 GeV to 10^9 GeV.

Abstract

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.