Subcritical hybrid inflation in a generalized superconformal model

TL;DR

This paper explores a generalized superconformal model that produces a subcritical regime of D-term hybrid inflation, deriving the effective potential and analyzing the resulting inflaton dynamics and tensor-to-scalar ratio.

Contribution

It introduces a new superconformal framework for subcritical hybrid inflation and derives the effective potential in both Jordan and Einstein frames.

Findings

Tensor-to-scalar ratio ranges from 10^{-4} to 0.1.

Various inflaton potential types emerge from the model.

The model accommodates different e-fold counts before inflation ends.

Abstract

We study a generalized superconformal model that gives rise to a subcritical regime of $D$-term hybrid inflation. Exhibiting the model both in a Jordan frame and in the Einstein frame, the effective potential of the subcritical regime is derived in the Einstein frame. It turns out the inflaton-waterfall field dynamics leads to various types of inflaton potential. Consequently the tensor-to-scalar ratio is found to range from $10^{-4}$ ($10^{-3}$) to $0.1$ for getting 60 (50) $e$-folds before the end of inflation.