An Inflationary Scenario in Intersecting Brane Models

TL;DR

This paper introduces a new D-term inflation model within intersecting brane frameworks, where the inflaton is a bifundamental chiral field, predicting a Gaussian red spectrum and linking baryogenesis and neutrino mass generation.

Contribution

It presents a novel brane-engineered D-term inflation scenario with implications for baryogenesis and neutrino masses, applicable across different SUSY breaking scales.

Findings

Predicts a near gaussian red spectrum with negligible tensor modes.

Provides a mechanism for baryon asymmetry generation at inflation's end.

Suggests neutrino Majorana masses can arise from tachyon condensation.

Abstract

We propose a new scenario for D-term inflation which appears quite straightforwardly in the open string sector of intersecting brane models. We take the inflaton to be a chiral field in a bifundamental representation of the hidden sector and we argue that a sufficiently flat potential can be brane engineered. This type of model generically predicts a near gaussian red spectrum with negligible tensor modes. We note that this model can very naturally generate a baryon asymmetry at the end of inflation via the recently proposed hidden sector baryogenesis mechanism. We also discuss the possibility that Majorana masses for the neutrinos can be simultaneously generated by the tachyon condensation which ends inflation. Our proposed scenario is viable for both high and low scale supersymmetry breaking.