No scale SUGRA SO(10) derived Starobinsky Model of Inflation

TL;DR

This paper demonstrates that a specific SO(10) supersymmetric GUT model without scale supergravity can produce a Starobinsky-like inflationary potential, compatible with various intermediate symmetry breaking patterns, and includes reheating mechanisms.

Contribution

It introduces a renormalizable SO(10) SUSY GUT model that naturally yields Starobinsky inflation without scale supergravity, with detailed analysis of symmetry breaking and reheating.

Findings

Successful inflation with specific intermediate symmetries

Reheating via non-perturbative decay of inflaton

Post-inflation universe consistent with MSSM

Abstract

We show that a supersymmetric renormalizable theory based on gauge group SO(10) and Higgs system {\bf {10 $\oplus$ 210 $\oplus$ 126 $\oplus$ $\overline{\bf 126}$}} with no scale supergravity can lead to a Starobinsky kind of potential for inflation. Successful inflation is possible in the cases where the potential during inflation corresponds to $SU(3)_C \times SU(2)_L \times SU(2)_R \times U(1)_{B-L}$, $SU(5)\times U(1)$ and flipped $SU(5)\times U(1)$ intermediate symmetry with a suitable choice of superpotential parameters. The reheating in such a scenario can occur via non perturbative decay of inflaton i.e. through "preheating". After the end of reheating, when universe cools down, the finite temperature potential can have a minimum which corresponds to MSSM.