Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2006-08-23
Physics
High Energy Physics
High Energy Physics - Phenomenology
7 pages, 2 figures; talk presented at the International Workshop on The Dark Side of the Universe (DSU2006), Madrid, Spain, Ju
Scientific paper
10.1063/1.2409099
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 $T_RH \approx 10^6$ GeV.
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