Tachyonic de Sitter Solutions of 10d Type II Supergravities - INSPIRE

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Tachyonic de Sitter Solutions of 10d Type II Supergravities

David Andriot
(
- Vienna, Tech. U.
)

Jan 15, 2021

31 pages

Published in:

Fortsch.Phys. 69 (2021) 7, 2100063

Published: Jul 1, 2021

e-Print:

2101.06251 [hep-th]

DOI:

10.1002/prop.202100063

View in:

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Abstract: (WILEY)

Cosmological models of the early or late universe exhibit (quasi) de Sitter space-times with different stability properties. Considering models derived from string theory, the swampland program does not provide for now a definite characterisation of this stability. In this work we focus on de Sitter solutions of 10d type II supergravities, candidates for classical de Sitter string backgrounds: surprisingly, all known examples are unstable with . We aim at proving the existence of such a systematic tachyon, and getting formally a bound on the value of . To that end, we develop three methods, giving us various sufficient conditions for having a tachyon upon assumptions, in analogy with de Sitter no-go theorems. Our analysis eventually indicates the existence of variety of different tachyons, and related bounds on . We use this knowledge to find 10 new de Sitter solutions of type IIB supergravity, that have tachyons of a different kind, higher values and new 6d geometries. One solution even appears to be stable, with however non-compact extra dimensions.

Note:

v2: 31 pages + appendices; few additions, including references and 5 figures. A Mathematica Notebook is provided here as an ancillary file with all solutions of this paper arXiv:2101.06251, as well as those of arXiv:2005.12930

cosmology
classical de Sitter solutions
string phenomenology
supergravity compactifications
tachyons
space-time: de Sitter
supergravity: Type IIB
tachyon
stability
cosmological model

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