On NS5-brane instantons and volume stabilization
Hugo Looyestijn, Stefan Vandoren
TL;DR
This paper investigates how NS5-brane instantons influence volume stabilization in string compactifications, showing they can modify the scalar potential and enable de Sitter vacua under certain conditions.
Contribution
It provides a detailed analysis of NS5-brane instanton effects on Kahler potential corrections and their role in achieving stable de Sitter vacua in flux compactifications.
Findings
NS5-brane instantons significantly correct the Kahler potential.
Instantons can generate uplifting terms for de Sitter vacua.
Conditions identified for instantons to contribute to volume stabilization.
Abstract
We study general aspects of NS5-brane instantons in relation to the stabilization of the volume modulus in Calabi-Yau compactifications of type II strings with fluxes, and their orientifold versions. These instantons correct the Kahler potential and generically yield significant contributions to the scalar potential at intermediate values of string coupling constant and volume. Under suitable conditions they yield uplifting terms that allow for meta--stable de Sitter vacua.
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