Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Sneutrino Hybrid Inflation   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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The categories of this paper are: dg-ga
29
The categories of this paper are: funct-an
3
The categories of this paper are: physics
32
The categories of this paper are: atom-ph
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The categories of this paper are: eess
15
The categories of this paper are: nucl-ex
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The categories of this paper are: math-ph
30
The categories of this paper are: q-alg
11
The categories of this paper are: hep-lat
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The categories of this paper are: hep-th
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The categories of this paper are: hep-ex
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The categories of this paper are: bayes-an
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The categories of this paper are: acc-phys
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The categories of this paper are: quant-ph
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The categories of this paper are: nucl-th
1
The categories of this paper are: cs