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Paper   IPM / Physic / 16512
School of Physics
  Title:   Strengthening the de Sitter swampland conjecture in warm inflation
  Author(s): 
1.  R. Brandenberger
2.  V. Kamali
3.  R. O. Ramos
  Status:   Published
  Journal: JHEP
  Vol.:  08
  Year:  2020
  Pages:   127
  Supported by:  IPM
  Abstract:
The de Sitter constraint on the space of effective scalar field theories consistent with superstring theory provides a lower bound on the slope of the potential of a scalar field which dominates the evolution of the Universe, e.g., a hypothetical inflaton field. Whereas models of single scalar field inflation with a canonically normalized field do not obey this constraint, it has been claimed recently in the literature that models of warm inflation can be made compatible with it in the case of large dissipation. The de Sitter constraint is known to be derived from entropy considerations. Since warm inflation necessary involves entropy production, it becomes necessary to determine how this entropy production will affect the constraints imposed by the swampland conditions. Here, we generalize these entropy considerations to the case of warm inflation and show that the condition on the slope of the potential remains essentially unchanged and is, hence, robust even in the warm inflation dynamics. We are then able to conclude that models of warm inflation indeed can be made consistent with the swampland criteria.

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