Charanjit S. Aulakh, Ila Garg
Supersymmetric Unified theories which incorporate a renormalizable Type I
seesaw mechanism for small neutrino masses can also provide slow roll
inflection point inflation along a flat direction associated with a gauge
invariant combination of the Higgs, slepton and right handed sneutrino
superfields. Inflationary parameters are related to the Majorana and Dirac
couplings responsible for neutrino masses with the scale of inflation set by
the lightest right-handed neutrino mass $M_{\nu^c} \sim 10^6-10^{10}$ GeV.
Tuning of the neutrino Dirac and Majorana superpotential couplings and soft
Susy breaking parameters is required to enforce flatness of the inflationary
potential. In contrast to previous inflection point inflation models, provided
$M_{\nu^c}>>M_{Susy}$, the tuning is almost independent of the soft parameters
and thus radiatively stable. The fine tuning required for Type I seesaw
inflation is much less stringent than that in the case of MSSM inflation or
Dirac neutrino inflation due to the much larger value of the inflaton mass, and
thus requires no additional dynamics to make it plausible. Our scenario is
motivated and illustrated by the completely realistic New Minimal
Supersymmetric SO(10) GUT.
View original:
http://arxiv.org/abs/1201.0519
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