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

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

arXiv comment6 pages, no figure, version published in Phys. Rev. D

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• Reheating After Swampland Conjecture
• Instability of de Sitter space under thermal radiation in different vacua
• Non-canonical kinetic structures in the swampland
• Consistency of Tachyacoustic Cosmology with de Sitter Swampland Conjectures
• Eternal inflation in light of Wheeler-DeWitt equation
• Dilaton stabilization in KKLT revisited
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• Higgs potential near-criticality from a de Sitter swampland-like condition
• Brane/flux annihilation in double-throat system