Anomaly mediated SUSY breaking scenarios in the light of cosmology and in the dark (matter)

TL;DR

This paper reviews anomaly mediated supersymmetry breaking models, analyzing how dark matter density constraints under different cosmological scenarios impact their viability and collider phenomenology.

Contribution

It reexamines dark matter bounds on anomaly mediation models considering alternative cosmologies, highlighting the need to relax constraints to reduce model dependence.

Findings

Dark matter bounds vary significantly with cosmological assumptions.

Loosening dark matter constraints can expand viable parameter space.

Implications for collider searches are discussed.

Abstract

Anomaly mediation is a popular and well motivated supersymmetry breaking scenario. Different possible detailed realisations of this set-up are studied and actively searched for at colliders. Apart from limits coming from flavour, low energy physics and direct collider searches, these models are usually constrained by the requirement of reproducing the observations on dark matter density in the universe. We reanalyse these bounds and in particular we focus on the dark matter bounds both considering the standard cosmological model and alternative cosmological scenarios. These scenarios do not change the observable cosmology but relic dark matter density bounds strongly depend on them. We consider few benchmark points excluded by standard cosmology dark matter bounds and suggest that loosening the dark matter constraints is necessary in order to avoid a too strong (cosmological) model dependence in the limits that are obtained for these models. We also discuss briefly the implications for phenomenology and in particular at the Large Hadron Collider.