De Sitter Swampland Bound in Dirac-Born-Infeld Inflation Model. (arXiv:1812.07670v1 [hep-th])
<a href="http://arxiv.org/find/hep-th/1/au:+Seo_M/0/1/0/all/0/1">Min-Seok Seo</a>

We study the de Sitter (dS) swampland conjecture in 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
slow-roll parameter. This shows that quasi-dS spacetime in the DBI model is a
result of tuning.

We study the de Sitter (dS) swampland conjecture in 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
slow-roll parameter. This shows that quasi-dS spacetime in the DBI model is a
result of tuning.

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