Tachyonic effects on K\"ahler moduli stabilized inflaton potential in type-IIB/F theory

TL;DR

This paper explores how charged tachyonic scalars influence Kähler moduli stabilization and the inflaton potential in type-IIB/F theory, revealing their role in lowering the potential minimum and aiding inflation termination.

Contribution

It introduces the inclusion of charged tachyons in moduli stabilization and analyzes their effects on the inflaton potential within a hybrid inflation framework.

Findings

Tachyons lower the inflaton potential minimum.

Tachyons help end inflation.

Potential fine-tuning achieves near-zero cosmological constant.

Abstract

We investigate the effects of inclusion of charged tachyonic open-string scalars in the perturbative and the non-perturbative K\"ahler moduli stabilizations in a geometry of three intersecting magnetized D7-brane stacks in type-IIB/F theory and also study the overall influence of this process on the inflaton potential, in a hybrid inflation scenario. We find that a tachyon lowers the minimum of the inflaton potential and assists to end the inflation. For simplicity, we have included one tachyon at a time in the present work and observe that this procedure preserves the features of slow-roll plateau of the potential. An interesting observation here is that the tachyonic part of the potential can be fine-tuned to get an almost zero minimum of the potential, thereby conforming to the small experimental value of the cosmological constant