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arXiv · 1812.07670

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

Min-Seok Seo
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Abstract

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. This shows that quasi-dS spacetime in the DBI model is a result of tuning.

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Min-Seok Seo. 2019-05-07. de Sitter swampland bound in the Dirac-Born-Infeld inflation model. https://doi.org/10.1103/physrevd.99.106004

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