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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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

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spelling	doaj-8ba0c2d5052a4eca81b34726385c4cc42021-08-01T11:45:25ZengSpringerOpenJournal of High Energy Physics1029-84792021-07-012021711510.1007/JHEP07(2021)206Contracting cosmologies and the swamplandHeliudson Bernardo0Robert Brandenberger1Department of Physics, McGill UniversityDepartment of Physics, McGill UniversityAbstract 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.https://doi.org/10.1007/JHEP07(2021)206Cosmology of Theories beyond the SMSuperstring VacuaCompactification and String ModelsModels of Quantum Gravity
collection	DOAJ
language	English
format	Article
sources	DOAJ
author	Heliudson Bernardo Robert Brandenberger
spellingShingle	Heliudson Bernardo Robert Brandenberger Contracting cosmologies and the swampland Journal of High Energy Physics Cosmology of Theories beyond the SM Superstring Vacua Compactification and String Models Models of Quantum Gravity
author_facet	Heliudson Bernardo Robert Brandenberger
author_sort	Heliudson Bernardo
title	Contracting cosmologies and the swampland
title_short	Contracting cosmologies and the swampland
title_full	Contracting cosmologies and the swampland
title_fullStr	Contracting cosmologies and the swampland
title_full_unstemmed	Contracting cosmologies and the swampland
title_sort	contracting cosmologies and the swampland
publisher	SpringerOpen
series	Journal of High Energy Physics
issn	1029-8479
publishDate	2021-07-01
description	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.
topic	Cosmology of Theories beyond the SM Superstring Vacua Compactification and String Models Models of Quantum Gravity
url	https://doi.org/10.1007/JHEP07(2021)206
work_keys_str_mv	AT heliudsonbernardo contractingcosmologiesandtheswampland AT robertbrandenberger contractingcosmologiesandtheswampland
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Contracting cosmologies and the swampland

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