Contracting cosmologies and the swampland

Contracting cosmologies and the swampland

Abstract We consider the cosmology obtained using scalar fields with a negative potential energy, such as employed to obtain an Ekpyrotic phase of contraction. Applying the covariant entropy bound to the tower of states dictated by the distance conjecture, we find that the relative slope of the pote...

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Bibliographic Details
Main Authors: Heliudson Bernardo, Robert Brandenberger
Format: Article
Language:English
Published: SpringerOpen 2021-07-01
Series:Journal of High Energy Physics
Subjects:
Cosmology of Theories beyond the SM
Superstring Vacua
Compactification and String Models
Models of Quantum Gravity
Online Access:https://doi.org/10.1007/JHEP07(2021)206
Description
Summary:Abstract We consider the cosmology obtained using scalar fields with a negative potential energy, such as employed to obtain an Ekpyrotic phase of contraction. Applying the covariant entropy bound to the tower of states dictated by the distance conjecture, we find that the relative slope of the potential |V′|/|V| is bounded from below by a constant of the order one in Planck units. This is consistent with the requirement to obtain slow Ekpyrotic contraction. We also derive a refined condition on the potential which holds near local minima of a negative potential.
ISSN:1029-8479

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