Freeze-in self-interacting dark matter in warped extra dimension

A classically scale-invariant scalar singlet can be a MeV-scale dark matter, with a feeble Higgs portal coupling at O(10-10). Besides, an O(0.1) self-interaction coupling could further serve to alleviate the small-scale problems in the Universe. We show that, such a dark matter candidate can naturally arise in the warped extra dimension, with the huge span of parameter space predicted well within O(1) fundamental parameters. (C) 2021 The Authors. Published by Elsevier B.V.

Automated summary

This study demonstrates that a naturally occurring MeV-scale dark matter candidate can arise through a warped extra dimension, with weak Higgs portal coupling and self-interaction coupling to address small-scale problems in the universe. The vast parameter space predicted within O(1) fundamental parameters supports this dark matter model.