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: | , |
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| Format: | Article |
| Language: | English |
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Wiley
2013-01-01
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| Series: | Advances in High Energy Physics |
| Online Access: | http://dx.doi.org/10.1155/2013/803735 |
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| _version_ | 1832553178148634624 |
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| author | Kourosh Nozari Narges Rashidi |
| author_facet | Kourosh Nozari Narges Rashidi |
| author_sort | Kourosh Nozari |
| collection | DOAJ |
| 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. |
| format | Article |
| id | doaj-art-2eda2d9158f948fa87996b1410943eb3 |
| institution | Kabale University |
| issn | 1687-7357 1687-7365 |
| language | English |
| publishDate | 2013-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Advances in High Energy Physics |
| spelling | doaj-art-2eda2d9158f948fa87996b1410943eb32025-02-03T05:54:38ZengWileyAdvances 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 |
| spellingShingle | Kourosh Nozari Narges Rashidi Cosmological Dynamics of a Hybrid Chameleon Scenario Advances in High Energy Physics |
| title | 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_short | Cosmological Dynamics of a Hybrid Chameleon Scenario |
| title_sort | cosmological dynamics of a hybrid chameleon scenario |
| url | http://dx.doi.org/10.1155/2013/803735 |
| work_keys_str_mv | AT kouroshnozari cosmologicaldynamicsofahybridchameleonscenario AT nargesrashidi cosmologicaldynamicsofahybridchameleonscenario |