# On Stringy de Sitter Spacetimes

## TL;DR

This paper reexamines string theory models with de Sitter spacetime, revealing novel features and proposing that including additional stringy degrees of freedom could naturally produce such spacetimes.

## Contribution

It introduces new insights into stringy de Sitter models and suggests how more complex string degrees of freedom may lead to their natural emergence.

## Key findings

- Models interpolate between known supersymmetric solutions
- Revealed novel features in anisotropic axion-dilaton backgrounds
- Proposed a connection to complex Fano varieties and phase-space formalism

## Abstract

We reexamine a family of models with a 3+1-dimensional de Sitter spacetime obtained in the standard tree-level low-energy limit of string theory with a non-trivial anisotropic axion-dilaton background. While such limiting approximations are encouraging but incomplete, our analysis reveals a host of novel features, and shows these models to interpolate between standard and well understood supersymmetric string theory solutions. Finally, we conjecture that this de Sitter spacetime naturally arises by including more of the stringy degrees of freedom, such as a recently advanced variant of the phase-space formalism, as well as the analytic continuation of a complex two-dimensional Fano variety arising as a small resolution in a Calabi-Yau 5-fold.