期刊
UNIVERSE
卷 7, 期 10, 页码 -出版社
MDPI
DOI: 10.3390/universe7100363
关键词
string theory; de Sitter; Calabi-Yau; desingularization
资金
- Department of Energy [DE-SC0020220, DE-SC0020262]
- Julian Schwinger Foundation
- U.S. Department of Energy (DOE) [DE-SC0020220] Funding Source: U.S. Department of Energy (DOE)
The search for four-dimensional de Sitter spacetime solutions in string theory has been challenging, but recent analysis suggests a connection with bubble-nucleation theory and stringy cosmic brane construction.
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 the 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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