A covariant Lagrangian for stable nonsingular bounce

Abstract The nonsingular bounce models usually suffer from the ghost or gradient instabilities, as has been proved recently. In this paper, we propose a covariant effective theory for stable nonsingular bounce, which has the quadratic order of the second order derivative of the field ϕ but the backg...

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Main Authors:	Yong Cai, Yun-Song Piao
Format:	Article
Language:	English
Published:	SpringerOpen 2017-09-01
Series:	Journal of High Energy Physics
Subjects:	Classical Theories of Gravity Spacetime Singularities
Online Access:	http://link.springer.com/article/10.1007/JHEP09(2017)027

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spelling	doaj-15ff2362a9a34aa899ad2cdb5a6ecb8f2020-11-25T00:46:02ZengSpringerOpenJournal of High Energy Physics1029-84792017-09-012017911210.1007/JHEP09(2017)027A covariant Lagrangian for stable nonsingular bounceYong Cai0Yun-Song Piao1School of Physics, University of Chinese Academy of SciencesSchool of Physics, University of Chinese Academy of SciencesAbstract The nonsingular bounce models usually suffer from the ghost or gradient instabilities, as has been proved recently. In this paper, we propose a covariant effective theory for stable nonsingular bounce, which has the quadratic order of the second order derivative of the field ϕ but the background set only by P (ϕ, X). With it, we explicitly construct a fully stable nonsingular bounce model for the ekpyrotic scenario.http://link.springer.com/article/10.1007/JHEP09(2017)027Classical Theories of GravitySpacetime Singularities
collection	DOAJ
language	English
format	Article
sources	DOAJ
author	Yong Cai Yun-Song Piao
spellingShingle	Yong Cai Yun-Song Piao A covariant Lagrangian for stable nonsingular bounce Journal of High Energy Physics Classical Theories of Gravity Spacetime Singularities
author_facet	Yong Cai Yun-Song Piao
author_sort	Yong Cai
title	A covariant Lagrangian for stable nonsingular bounce
title_short	A covariant Lagrangian for stable nonsingular bounce
title_full	A covariant Lagrangian for stable nonsingular bounce
title_fullStr	A covariant Lagrangian for stable nonsingular bounce
title_full_unstemmed	A covariant Lagrangian for stable nonsingular bounce
title_sort	covariant lagrangian for stable nonsingular bounce
publisher	SpringerOpen
series	Journal of High Energy Physics
issn	1029-8479
publishDate	2017-09-01
description	Abstract The nonsingular bounce models usually suffer from the ghost or gradient instabilities, as has been proved recently. In this paper, we propose a covariant effective theory for stable nonsingular bounce, which has the quadratic order of the second order derivative of the field ϕ but the background set only by P (ϕ, X). With it, we explicitly construct a fully stable nonsingular bounce model for the ekpyrotic scenario.
topic	Classical Theories of Gravity Spacetime Singularities
url	http://link.springer.com/article/10.1007/JHEP09(2017)027
work_keys_str_mv	AT yongcai acovariantlagrangianforstablenonsingularbounce AT yunsongpiao acovariantlagrangianforstablenonsingularbounce AT yongcai covariantlagrangianforstablenonsingularbounce AT yunsongpiao covariantlagrangianforstablenonsingularbounce
_version_	1725267377608720384

A covariant Lagrangian for stable nonsingular bounce

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