de Sitter swampland bound in the Dirac-Born-Infeld inflation model

de Sitter swampland bound in the Dirac-Born-Infeld inflation model

We study the de Sitter (dS) swampland conjecture in the Dirac-Born-Infeld (DBI) inflation model. We obtain the dS swampland bound for the relativistic regime using Bousso's entropy bound argument and proper distance. It restricts mPl∇V/V by some positive constant depending on warping and the fi...

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Veröffentlicht in:Physical review. D 2019-05, Vol.99 (10), p.106004, Article 106004
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description We study the de Sitter (dS) swampland conjecture in the Dirac-Born-Infeld (DBI) inflation model. We obtain the dS swampland bound for the relativistic regime using Bousso's entropy bound argument and proper distance. It restricts mPl∇V/V by some positive constant depending on warping and the field range. In the specific case of the DBI model driven by the quadratic potential, the model-dependent backreaction argument is interpreted as a natural bound for the slow-roll parameter. This shows that quasi-dS spacetime in the DBI model is a result of tuning.
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