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2018

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

Seo, Min-Seok

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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 $m_{\rm Pl}\nabla V/V$ 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.

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