Scale-invariant scalar field dark matter through the Higgs portal
Abstract
We introduce an oscillating scalar field coupled to the Higgs that can account for all dark matter in the Universe. Due to an underlying scale invariance of this model, the dark scalar only acquires mass after the electroweak phase transition. We discuss the dynamics of this dark matter candidate, showing that it behaves like dark radiation until the Electroweak phase transition and like non-relativistic matter afterwards. In the case of a negative coupling to the Higgs field, the scalar gets a vacuum expectation value after the electroweak phase transition and may decay into photons, although being sufficiently long-lived to account for dark matter. We show that, within this scenario, for a mass of 7 keV, the model can explain the observed galactic and extra-galactic 3.5 keV X-ray line. Nevertheless, it will be very difficult to probe this model in the laboratory in the near future.
Keywords
Cite
@article{arxiv.1911.10622,
title = {Scale-invariant scalar field dark matter through the Higgs portal},
author = {Catarina Cosme},
journal= {arXiv preprint arXiv:1911.10622},
year = {2019}
}
Comments
Talk at the XI Symposium Quantum Theory and Symmetries (QTS-XI) (July 1st to 5th, 2019, CRM, Univ. of Montreal); to appear in the proceedings (CRM Series on Mathematical Physics, Springer, 2020), Eds. Richard MacKenzie, Manu Paranjape, Zora Thomova, Pavel Winternitz, William Witczak-Krempa. This proceedings paper is based on arXiv:1802.09434v2 [hep-ph] and arXiv:1709.09674v2 [hep-ph]