Cosmological Dynamics of a Hybrid Chameleon Scenario

Cosmological Dynamics of a Hybrid Chameleon Scenario

We consider a hybrid scalar field which is nonminimally coupled to the matter and models a chameleon cosmology. By introducing an effective potential, we study the dependence of the effective potential's minimum and hybrid chameleon field's masses on the local matter density. In a dynamica...

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Main Authors: Kourosh Nozari, Narges Rashidi
Format: Article
Language:English
Published: Hindawi Limited 2013-01-01
Series:Advances in High Energy Physics
Online Access:http://dx.doi.org/10.1155/2013/803735
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spelling doaj-2eda2d9158f948fa87996b1410943eb32020-11-24T22:01:48ZengHindawi LimitedAdvances in High Energy Physics1687-73571687-73652013-01-01201310.1155/2013/803735803735Cosmological Dynamics of a Hybrid Chameleon ScenarioKourosh Nozari0Narges Rashidi1Research Institute for Astronomy and Astrophysics of Maragha (RIAAM), P.O. Box 55134-441, Maragha, IranDepartment of Physics, Faculty of Basic Sciences, University of Mazandaran, P.O. Box 47416-95447, Babolsar, IranWe consider a hybrid scalar field which is nonminimally coupled to the matter and models a chameleon cosmology. By introducing an effective potential, we study the dependence of the effective potential's minimum and hybrid chameleon field's masses on the local matter density. In a dynamical system technique, we analyze the phase space of this two-field chameleon model, find its fixed points and study their stability. We show that the hybrid chameleon domination solution is a stable attractor and the universe in this setup experiences a phantom divide crossing.http://dx.doi.org/10.1155/2013/803735
collection DOAJ
language English
format Article
sources DOAJ
author Kourosh Nozari
Narges Rashidi
spellingShingle Kourosh Nozari
Narges Rashidi
Cosmological Dynamics of a Hybrid Chameleon Scenario
Advances in High Energy Physics
author_facet Kourosh Nozari
Narges Rashidi
author_sort Kourosh Nozari
title Cosmological Dynamics of a Hybrid Chameleon Scenario
title_short Cosmological Dynamics of a Hybrid Chameleon Scenario
title_full Cosmological Dynamics of a Hybrid Chameleon Scenario
title_fullStr Cosmological Dynamics of a Hybrid Chameleon Scenario
title_full_unstemmed Cosmological Dynamics of a Hybrid Chameleon Scenario
title_sort cosmological dynamics of a hybrid chameleon scenario
publisher Hindawi Limited
series Advances in High Energy Physics
issn 1687-7357
1687-7365
publishDate 2013-01-01
description We consider a hybrid scalar field which is nonminimally coupled to the matter and models a chameleon cosmology. By introducing an effective potential, we study the dependence of the effective potential's minimum and hybrid chameleon field's masses on the local matter density. In a dynamical system technique, we analyze the phase space of this two-field chameleon model, find its fixed points and study their stability. We show that the hybrid chameleon domination solution is a stable attractor and the universe in this setup experiences a phantom divide crossing.
url http://dx.doi.org/10.1155/2013/803735
work_keys_str_mv AT kouroshnozari cosmologicaldynamicsofahybridchameleonscenario
AT nargesrashidi cosmologicaldynamicsofahybridchameleonscenario
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