Journal
JOURNAL OF HIGH ENERGY PHYSICS
Volume -, Issue 1, Pages -Publisher
SPRINGER
DOI: 10.1007/JHEP01(2022)183
Keywords
Brane Dynamics in Gauge Theories; Superstring Vacua; Flux Compactifications
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Motivated by the lack of consensus on whether or not de Sitter (dS) lies in the Swampland, the authors use a braneworld construction and known Anti-de Sitter (AdS) vacua to compute an explicit effective dS cosmology in three dimensions. The cosmological constants are calculated in different scenarios, showing that small positive values admitting a dS cosmology can be obtained in certain cases.
Motivated by the lack of consensus on whether or not de Sitter (dS) lies in the Swampland, we use a recently developed braneworld construction and known Anti-de Sitter (AdS) vacua to compute an explicit effective dS cosmology in three dimensions. We consider a non-perturbative AdS(4) vacuum decaying to another lower AdS(4) vacuum via bubble-nucleation. We also consider the more speculative case where a dS(4) decay to a Minkowski(4). The Israel junction conditions are solved across the bubble and we obtain the Friedmann equations from which the cosmological constants can be read off, in the respective cases. The cosmological constants are computed in a flux background yielding small positive values admitting a dS cosmology. However, we find that an energetically viable model in the AdS to AdS case requires more fine-tuning.
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