Topics In Large Volume Swiss-Cheese Compactification Geometries

TL;DR

This review explores large volume Swiss-Cheese type IIB string compactifications, addressing cosmological and phenomenological issues, including de Sitter vacua, inflation, particle physics scales, and moduli stabilization, using geometric and toric methods.

Contribution

It provides a unified analysis of string cosmology and phenomenology within a single compactification scheme, incorporating geometric techniques and resolving longstanding tensions.

Findings

Realization of metastable de Sitter vacua without anti-D3 branes

Calculation of geometric Kaehler potential using GLSM and toric data

Explicit estimates of soft masses, couplings, and neutrino mass scales

Abstract

In this review article, we present a systematic study of large volume type IIB string compactifications that addresses several interesting issues in string cosmology and string phenomenology within a single string compactification scheme. The issues in string cosmology include obtaining a metastable non-supersymmetric dS minimum without adding anti-D3 branes and obtaining slow-roll inflation with the required number of 60 e-foldings along with non-trivial non-Gaussianities and gravitational waves. For studying cosmology and phenomenology within a single string compactification scheme, we provide a geometric resolution to a long-standing tension between LVS cosmology and LVS phenomenology after incorporating the effect of a single mobile spacetime-flling D3-brane and stacks of fluxed D7-branes wrapping the "big" divisor of a Swiss-Cheese CY. Further, using GLSM techniques and the toric data for the Swiss-Cheese CY, we calculate geometric Kaehler potential in LVS limit which are subdominant as compared to the tree level and (non-) perturbative contributions. The issues in string phenomenology which has been addressed in this review article, include realizing order one YM couplings, obtaining O(TeV) gravitino and explicit calculation of various soft masses and couplings along with the possibility of realizing fermionic mass scales of first two generations, order eV neutrino mass scale and an estimate of the proton lifetime. Apart from the issues related to (string) cosmology/phenomenology, we also discuss some other interesting issues on implications of moduli stabilization via inclusion of fluxes in the same type IIB compactification scheme. These issues include the existence of area codes, `inverse-problem' related to non-supersymmetric black hole attractors and existence of fake superpotentials.