BMSSM Implications for Cosmology

TL;DR

The paper explores how the BMSSM, an extension of the MSSM with non-renormalizable Higgs terms, impacts cosmological issues like dark matter relic abundance and baryogenesis, potentially resolving previous constraints.

Contribution

It provides a detailed analysis of the cosmological implications of BMSSM, identifying new allowed regions for dark matter and electroweak phase transition conditions.

Findings

Relic abundance regions are expanded, including the bulk region.

Electroweak phase transition can be strongly first order in previously incompatible regions.

Vacuum stability imposes constraints on the allowed parameter space.

Abstract

The addition of non-renormalizable terms involving the Higgs fields to the MSSM (BMSSM) ameliorates the little hierarchy problem of the MSSM. We analyze in detail the two main cosmological issues affected by the BMSSM: dark matter and baryogenesis. The regions for which the relic abundance of the LSP is consistent with WMAP and collider constraints are identified, showing that the bulk region and other previously excluded regions are now permitted. Requiring vacuum stability limits the allowed regions. Based on a two-loop finite temperature effective potential analysis, we show that the electroweak phase transition can be sufficiently first order in regions that for the MSSM are incompatible with the LEP Higgs mass bound, including parameter values of \tan\beta \lsim 5, m_{\tilde{t}_{1}} > m_t, m_Q << TeV.