Type IIB Conifold Transitions in Cosmology

TL;DR

This paper investigates the cosmological implications of conifold transitions in Calabi-Yau spaces within IIB supergravity, focusing on how light states influence the transition dynamics and moduli stabilization.

Contribution

It constructs effective actions for conifold transitions considering D3-brane states and analyzes their impact on cosmological evolution and moduli stabilization.

Findings

Light states are crucial for the realization of conifold transitions.

The effective actions incorporate D3-brane masses on collapsing cycles.

Transition dynamics depend on the excitation level of additional states.

Abstract

We study four-dimensional low energy effective actions for conifold transitions of Calabi-Yau spaces in the context of IIB supergravity. The actions are constucted by examining the mass of D3-branes wrapped on collapsing/expanding three-cycles. We then study the cosmology of the conifold transition, including consequences for moduli stabilization, taking into account the effect of the additional states which become light at the transition. We find, the degree to which the additional states are excited is essential for whether the transition is dynamically realized.