Flat Direction Inflation with Running Kinetic Term and Baryogenesis

TL;DR

This paper proposes a model where a flat direction in the minimal supersymmetric standard model acts as the inflaton with a generalized shift symmetry, enabling large-field inflation and baryogenesis through a helical motion of the field.

Contribution

It introduces a generalized shift symmetry to control the inflaton potential and naturally incorporate baryogenesis via a helical motion after inflation.

Findings

Successful realization of large-field inflation with flat directions.

Automatic baryon number generation via field dynamics.

Suppression of baryonic isocurvature fluctuations.

Abstract

We consider a possibility that one of the flat directions in the minimal supersymmetric standard model plays the role of the inflaton field and realizes large-field inflation. This is achieved by introducing a generalized shift symmetry on the flat direction, which enables us to control the inflaton potential over large field values. After inflation, higher order terms allowed by the generalized shift symmetry automatically cause a helical motion of the field to create the baryon number of the universe, while baryonic isocurvature fluctuations are suppressed.