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# Asymmetric Reheating via Inverse Symmetry Breaking

Aurora Ireland and Seth Koren

Submitted on 23 November 2022

## Abstract

Asymmetric reheating is a generic requirement for models of dark sectors with light species, but its implementation is usually in tension with unique phenomenologies otherwise possible in compelling theories containing dark copies of the Standard Model. We present a simple module to implement asymmetric reheating during a ${\mathbb{Z}}_{2}$-breaking phase above some critical temperature. This reinvigorates the possibility of an exactly degenerate mirror sector and the striking phenomenology of composite particles oscillating into their mirror counterparts.

## Preprint

Comment: 5 pages, 3 figures

Subjects: High Energy Physics - Phenomenology; Astrophysics - Cosmology and Nongalactic Astrophysics