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Sneutrino Hybrid Inflation in Supergravity

Stefan Antusch·Mar Bastero-Gil·Steve F. King·Qaisar Shafi
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Abstract

We propose a hybrid inflation scenario in which the singlet sneutrino, the superpartner of the right-handed neutrino, plays the role of the inflaton. We study a minimal model of sneutrino hybrid inflation in supergravity, where we find a spectral index $n_s \approx 1 + 2 γ$ with $|γ| \lesssim 0.02$, and predict a running spectral index $|d n_s/d\ln k| \ll |γ|$ and a tensor-to-scalar ratio $r \ll γ^2$ for field values well below the Planck scale. In our scenario, the baryon asymmetry of our universe can be explained via non-thermal leptogenesis and a low reheat temperature $T_{RH} \approx 10^{6}$ GeV can be realized.

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Stefan Antusch, Mar Bastero-Gil, Steve F. King, Qaisar Shafi. 2005-04-29. Sneutrino Hybrid Inflation in Supergravity. https://doi.org/10.1103/physrevd.71.083519

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