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Title

Quantum breaking bound on de Sitter and swampland

AuthorsDvali, Gia; Gómez, César CSIC; Zells, Sebastian
KeywordsDe Sitter, Quantum breaking bound
Issue Date18-Dec-2018
PublisherJohn Wiley & Sons
CitationFortschritte der Physik 67 (2019)
AbstractQuantum consistency suggests that any de Sitter patch that lasts a number of Hubble times that exceeds its Gibbons-Hawking entropy divided by the number of light particle species suffers an effect of quantum breaking. Inclusion of other interactions makes the quantum break-time shorter. The requirement that this must not happen puts severe constraints on scalar potentials, essentially suppressing the self-reproduction regimes. In particular, it eliminates both local and global minima with positive energy densities and imposes a general upper bound on the number of e-foldings in any given Hubble patch. Consequently, maxima and other tachyonic directions must be curved stronger than the corresponding Hubble parameter. We show that the key relations of the recently-proposed de Sitter swampland conjecture follow from the de Sitter quantum breaking bound. We give a general derivation and also illustrate this on a concrete example of D-brane inflation. We can say that string theory as a consistent theory of quantum gravity nullifies a positive vacuum energy in self-defense against quantum breaking.
Publisher version (URL)http://dx.doi.org/10.1002/prop.201800094
URIhttp://hdl.handle.net/10261/201902
DOIhttp://dx.doi.org/10.1002/prop.201800094
Identifiersdoi: 10.1002/prop.201800094
issn: 1521-3978
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