Informal Pizza Seminar

Thermal inflation, gravitational waves, baryogenesis and dark matter

Wan-il Park

KAIST

We propose a simple extension of the Minimal Supersymmetric Standard Model which gives rise to thermal inflation, baryogenesis and dark matter in a natural and remarkably consistent way. We consider the λ_φ = 0 special case of our previous model, which is the minimal way to incorporate a Peccei-Quinn symmetry.

The axino becomes the lightest supersymmetric particle with m_ã ∼ 1 to 10 GeV and is typically over-produced during the flaton decay.

Interestingly though, the dark matter abundance is minimized for m_ã ∼ 1, f_a ∼ 10¹¹ to 10¹² GeV and |μ| ∼ 400 GeV to 1 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.