No-scale hybrid inflation with R-symmetry breaking

Abstract

In this paper we provide a no-scale supergravity scenario of hybrid inflation with R-symmetry being broken maximally. We investigate the inflation dynamics in details in both cases of pure F-term hybrid inflation and when adding constant Fayet-Iliopoulos D-terms. The effective inflation potential is asymptotically flat in a region of the parameter space in both cases. We explore all regions in the parameter space when discussing the constraints from the observables. We point out a connection between inflation, R-symmetry breaking and GUT scales. The moduli backreaction and SUSY breaking effects are investigated in a specific stabilization mechanism. We emphasis that a successful reheating is not affected by R-symmetry breaking, but it has interesting consequences. We study the reheating in flipped GUT model. We argue in favor of $Z_2$ symmetry associated with flipped GUT models to avoid phenomenologically dangerous operators and allow for decay channels for the inflaton to right-handed neutrinos (sneutrinos).

30 pages, 9 figures, submitted to JHEP

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• Modified hybrid inflation in no-scale SUGRA with suppressed $R$-symmetry breaking
• No-scale gauge non-singlet inflation inducing TeV scale inverse seesaw mechanism
• Leading UV divergences of quantum corrections to Kähler superpotential in general $\mathcal{N}=1$ chiral model