Freeze-in bino dark matter in high scale supersymmetry

TL;DR

This paper investigates a high scale supersymmetry scenario where bino dark matter is produced via freeze-in, with the supersymmetric particles mostly decoupled except for gauginos, and identifies viable parameter regions consistent with cosmological constraints.

Contribution

It introduces a novel high scale supersymmetry framework where bino dark matter is generated through freeze-in, detailing the parameter space compatible with cosmological and experimental constraints.

Findings

Bino dark matter with mass 0.1-1 TeV can account for relic abundance.

Supersymmetry breaking scale $M_{SUSY}$ around $10^{12-14}$ GeV is consistent with the scenario.

Reheating temperature $T_{RH}$ around $10^{4-6}$ GeV supports freeze-in production.

Abstract

We explore a scenario of high scale supersymmetry where all supersymmetric particles except gauginos stay at a high energy scale $M_{\rm SUSY}$ which is much larger than the reheating temperature $T_\text{RH}$. The dark matter is dominated by bino component with mass around the electroweak scale and the observed relic abundance is mainly generated by the freeze-in process during the early universe. Considering the various constraints, we identify two available scenarios in which the supersymmetric sector at an energy scale below $T_\text{RH}$ consists of: a) bino; b) bino and wino. Typically, for a bino mass around 0.1-1 TeV and a wino mass around 2 TeV, we find that $M_{\rm SUSY}$ should be around $10^{12-14}$ GeV with $T_\text{RH}$ around $10^{4-6}$ GeV.