Relic density and future colliders: inverse problem(s)

TL;DR

This paper discusses how pre-BBN cosmological conditions can significantly alter relic density constraints on supersymmetry, emphasizing caution in their use and introducing a new relic density calculator, SuperIso Relic.

Contribution

It highlights the impact of pre-BBN physics on relic density constraints and presents a new publicly available tool, SuperIso Relic, for supersymmetry calculations under alternative cosmological models.

Findings

Pre-BBN energy or entropy can change relic density constraints.

Relic density constraints may be misleading if pre-BBN physics is ignored.

SuperIso Relic incorporates alternative cosmological models for SUSY relic density calculations.

Abstract

Relic density calculations are often used to constrain particle physics models, and in particular supersymmetry. We will show that the presence of additional energy or entropy before the Big-Bang nucleosynthesis can however completely change the relic density constraints on the SUSY parameter space. Therefore one should be extremely careful when using the relic density to constrain supersymmetry as it could give misleading results, especially if combined with the future collider data. Alternatively, we will also show that combining the discoveries of the future colliders with relic density calculations can shed light on the inaccessible pre-BBN dark time physics. Finally we will present SuperIso Relic, a new relic density calculator code in Supersymmetry, which incorporates alternative cosmological models, and is publicly available.