Thermal inflation, baryogenesis and axions

Abstract

In a previous paper, we proposed a simple extension of the Minimal Supersymmetric Standard Model which gives rise to thermal inflation and baryogenesis in a natural and remarkably consistent way. In this paper, we consider the ${\lambda }_{\varphi }=0$ special case of our model, which is the minimal way to incorporate a Peccei-Quinn symmetry. The axino/flatino becomes the lightest supersymmetric particle with $m_{\text{axino}}\sim 1$ to $10\text{GeV}$ and is typically over-produced during the flaton decay. Interestingly though, the dark matter abundance is minimized for $m_{\text{axino}}\sim 1\text{GeV}$, $f_a\sim 10^{11}$ to $10^{12}\text{GeV}$ and $|\mu |\sim 400\text{GeV}$ to $2\text{TeV}$ at an abundance coincident with the observed abundance and with significant amounts of both axions and axinos. Futhermore, for these values the baryon abundance naturally matches the observed abundance.

Comments: 53 pages, 20 figures. Figures reformatted, minor changes in Section 3, references added