Sneutrino Hybrid Inflation

Abstract

We review the scenario of sneutrino hybrid inflation, where one of the singlet sneutrinos, the superpartners of the right-handed neutrinos, plays the role of the inflaton. In a minimal model of sneutrino hybrid inflation, the spectral index is given by $n_s\approx 1+2\gamma$. With $\gamma =0.025\pm 0.01$ constrained by WMAP, a running spectral index $|d{n}_s/d\ln k|\ll |\gamma |$ and a tensor-to-scalar ratio $r\ll {\gamma }^2$ are predicted. Small neutrino masses arise from the seesaw mechanism, with heavy masses for the singlet (s)neutrinos generated by the vacuum expectation value of the waterfall field after inflation. The baryon asymmetry of the universe can be explained by non-thermal leptogenesis via sneutrino inflaton decay, with low reheat temperature $T_{R}H\approx 10^6$ GeV.

7 pages, 2 figures; talk presented at the International Workshop on The Dark Side of the Universe (DSU2006), Madrid, Spain, June 20-24, 2006

References in corpus (4)

• Wilkinson Microwave Anisotropy Probe (WMAP) Three Year Results: Implications for Cosmology
• Supergravity Modification of D-term Hybrid Inflation: Solving the Cosmic String and Spectral Index Problems via a Right-Handed Sneutrino
• D-term Inflation and Leptogenesis by Right-handed Sneutrino
• Double sneutrino inflation and its phenomenologies

Cited by in corpus (7)

• Encyclopaedia Inflationaris
• Matter inflation with A_4 flavour symmetry breaking
• Flipped GUT Inflation
• Hybrid inflation with moduli stabilization and low scale supersymmetry breaking
• Non-thermal Leptogenesis after Majoron Hilltop Inflation
• Lagrangian formulation for an extended cosmological equation-of-state
• Realising effective theories of tribrid inflation: Are there effects from messenger fields?