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...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
| Published: |
Hindawi Limited
2013-01-01
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| Series: | Advances in High Energy Physics |
| Online Access: | http://dx.doi.org/10.1155/2013/803735 |
| Summary: | 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. |
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| ISSN: | 1687-7357 1687-7365 |