New Inflation in Waterfall Region

TL;DR

This paper proposes a new class of inflation models within the waterfall region of hybrid inflation, demonstrating their compatibility with observational data and their potential for successful reheating and leptogenesis.

Contribution

It introduces a novel inflationary scenario in the waterfall region, realized within a supersymmetric tribrid framework, and evaluates its observational viability.

Findings

Predictions align with Planck data.

Model supports reheating and leptogenesis.

Includes both single-field and multi-field scenarios.

Abstract

We introduce a class of new inflation models within the waterfall region of a generalized hybrid inflation framework. The initial conditions are generated in the valley of hybrid preinflation. Both single-field and multi-field inflationary scenarios have been identified within this context. A supersymmetric realization of this scenario can successfully be achieved within the tribrid inflation framework. To assess the model's viability, we calculate the predictions of inflationary observables using the $\delta N$ formalism, demonstrating excellent agreement with the most recent Planck data. Furthermore, this model facilitates successful reheating and nonthermal leptogenesis, with the matter-field component of the inflaton identified as a sneutrino.