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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...
Autores principales: | , , |
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Lenguaje: | eng |
Publicado: |
2011
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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. |
id | cern-1380421 |
institution | Organización Europea para la Investigación Nuclear |
language | eng |
publishDate | 2011 |
record_format | invenio |
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 |