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G-Bounce

We present a wide class of models which realise a bounce in a spatially flat Friedmann universe in standard General Relativity. The key ingredient of the theories we consider is a noncanonical, minimally coupled scalar field belonging to the class of theories with Kinetic Gravity Braiding / Galileon...

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Detalles Bibliográficos
Autores principales: Easson, Damien A, Sawicki, Ignacy, Vikman, Alexander
Lenguaje:eng
Publicado: 2011
Materias:
Acceso en línea:https://dx.doi.org/10.1088/1475-7516/2011/11/021
http://cds.cern.ch/record/1380421
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author Easson, Damien A
Sawicki, Ignacy
Vikman, Alexander
author_facet Easson, Damien A
Sawicki, Ignacy
Vikman, Alexander
author_sort Easson, Damien A
collection CERN
description We present a wide class of models which realise a bounce in a spatially flat Friedmann universe in standard General Relativity. The key ingredient of the theories we consider is a noncanonical, minimally coupled scalar field belonging to the class of theories with Kinetic Gravity Braiding / Galileon-like self-couplings. In these models, the universe smoothly evolves from contraction to expansion, suffering neither from ghosts nor gradient instabilities around the turning point. The end-point of the evolution can be a standard radiation-domination era or an inflationary phase. We formulate necessary restrictions for Lagrangians needed to obtain a healthy bounce and illustrate our results with phase portraits for simple systems including the recently proposed Galilean Genesis scenario.
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institution Organización Europea para la Investigación Nuclear
language eng
publishDate 2011
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spelling cern-13804212019-09-30T06:29:59Zdoi:10.1088/1475-7516/2011/11/021http://cds.cern.ch/record/1380421engEasson, Damien ASawicki, IgnacyVikman, AlexanderG-BounceParticle Physics - TheoryWe present a wide class of models which realise a bounce in a spatially flat Friedmann universe in standard General Relativity. The key ingredient of the theories we consider is a noncanonical, minimally coupled scalar field belonging to the class of theories with Kinetic Gravity Braiding / Galileon-like self-couplings. In these models, the universe smoothly evolves from contraction to expansion, suffering neither from ghosts nor gradient instabilities around the turning point. The end-point of the evolution can be a standard radiation-domination era or an inflationary phase. We formulate necessary restrictions for Lagrangians needed to obtain a healthy bounce and illustrate our results with phase portraits for simple systems including the recently proposed Galilean Genesis scenario.arXiv:1109.1047CERN-PH-TH-2011-203oai:cds.cern.ch:13804212011-09-07
spellingShingle Particle Physics - Theory
Easson, Damien A
Sawicki, Ignacy
Vikman, Alexander
G-Bounce
title G-Bounce
title_full G-Bounce
title_fullStr G-Bounce
title_full_unstemmed G-Bounce
title_short G-Bounce
title_sort g-bounce
topic Particle Physics - Theory
url https://dx.doi.org/10.1088/1475-7516/2011/11/021
http://cds.cern.ch/record/1380421
work_keys_str_mv AT eassondamiena gbounce
AT sawickiignacy gbounce
AT vikmanalexander gbounce