Lepton collider as a window to reheating via freezing in dark matter detection. Part II
Abstract
Dark matter (DM) genesis via Ultraviolet (UV) freeze-in embeds the seed of reheating temperature and dynamics in its relic density. Thus, discovery of such a DM candidate can possibly open the window for post-inflationary dynamics. However, there are several challenges in this exercise, as freezing-in DM possesses feeble interaction with the visible sector and therefore very low production cross-section at the collider. We show that mono-photon (and dilepton) signal at the ILC, arising from DM effective operators connected to the SM field strength tensors, can still warrant a signal discovery. We study both the scalar and fermionic DM production during reheating via UV freeze-in, when the inflaton oscillates at the bottom of a general monomial potential. Interestingly, we see, right DM abundance can be achieved only in the case of bosonic reheating scenario, satisfying bounds from big bang nucleosynthesis (BBN). This provides a unique correlation between collider signal and the post-inflationary dynamics of the Universe within single-field inflationary models.
Cite
@article{arxiv.2410.18198,
title = {Lepton collider as a window to reheating via freezing in dark matter detection. Part II},
author = {Basabendu Barman and Subhaditya Bhattacharya and Sahabub Jahedi and Dipankar Pradhan and Abhik Sarkar},
journal= {arXiv preprint arXiv:2410.18198},
year = {2025}
}
Comments
28 pages, 11 figures, 4 tables, and matches the version published in JHEP