Stringy Bubbles Solve de Sitter Troubles
Per Berglund, Tristan H\"ubsch, Djordje Minic

TL;DR
This paper proposes a string theory-based model involving bubble nucleation and cosmic branes that naturally produce a de Sitter universe with a small positive cosmological constant, addressing a key challenge in theoretical physics.
Contribution
It introduces a novel stringy construction using bubble nucleation and conifold resolutions to realize four-dimensional de Sitter solutions with desirable physical properties.
Findings
Demonstrates a stringy cosmic brane model that yields de Sitter spacetime.
Shows how conifold singularity resolutions can produce de Sitter solutions.
Provides a framework for localized gravity and matter in string theory contexts.
Abstract
Finding four-dimensional de Sitter spacetime solutions in string theory has been a vexing quest ever since the discovery of the accelerating expansion of the universe. Building on a recent analysis of bubble-nucleation in the decay of (false-vacuum) AdS backgrounds where the interfacing bubbles themselves exhibit a de Sitter geometry we show that this resonates strongly with a stringy cosmic brane construction that naturally provides for an exponential mass-hierarchy, and localization of both gravity and matter, in addition to an exponentially suppressed positive cosmological constant. Finally, we argue that these scenarios can be realized in terms of a generalization of a small resolution of a conifold singularity in the context of a (Lorentzian) Calabi-Yau 5-fold, where the isolated (Lorentzian) two complex dimensional Fano variety is a four-dimensional de Sitter spacetime.
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