4.7 Article

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

Journal

PHYSICAL REVIEW D
Volume 99, Issue 10, Pages -

Publisher

AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.99.106004

Keywords

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Funding

  1. NRF Basic Science Research Program [NRF-2016R1A2B4008759]

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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(P1)del 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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