Lepton collider as a window to reheating via freezing in dark matter detection. Part I

TL;DR

This paper introduces a method to determine the Universe's reheat temperature using collider signals of dark matter freezing, focusing on mono-gamma signals at electron-positron colliders, linking cosmology and particle physics.

Contribution

It presents a novel approach to infer the reheat temperature from collider data, connecting dark matter models with early Universe reheating dynamics.

Findings

Mono-gamma signals can indicate low-scale reheat temperatures.

The methodology aligns collider signals with cosmological constraints.

It enables correlation between reheating, dark matter, and collider observations.

Abstract

We propose a methodology to infer the reheat temperature ($T_{\rm RH}$) of the Universe from the collider signal of freezing in dark matter (DM). We demonstrate it for the mono-$\gamma$ signal at the electron-positron colliders, which indicates to a low-scale $T_{\rm RH}$, after addressing observed DM abundance, BBN, and other relevant constraints. The method can be used to correlate different reheating dynamics, DM models, and collider signals.