# Higgsino Dark Matter in a Non-Standard History of the Universe

## TL;DR

This paper explores how a non-standard early universe history involving a scalar field can enable a light higgsino to account for dark matter, which is otherwise under-abundant in standard cosmology.

## Contribution

It demonstrates that a scalar field-driven non-standard cosmological history can produce the correct higgsino dark matter relic abundance.

## Key findings

- A proper reheating temperature allows light higgsino to match observed dark matter levels.
- Observation of sub-TeV higgsino would suggest a non-standard early universe history.

## Abstract

A light higgsino is strongly favored by the naturalness, while as a dark matter candidate it is usually under-abundant. We consider the higgsino production in a non-standard history of the universe, caused by a scalar field with an initially displaced vacuum. We find that given a proper reheating temperature induced by the scalar decay, a light higgsino could provide the correct dark matter relic abundance. On the other hand, a sub-TeV higgsino dark matter, once observed, would be a strong hint of the non-standard thermal history of the universe.