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Nozari, Kourosh; Rashidi, N. (2013)
Publisher: Hindawi Publishing Corporation
Journal: Advances in High Energy Physics
Languages: English
Types: Article
Subjects: General Relativity and Quantum Cosmology, Physics, QC1-999, Article Subject, Astrophysics - Cosmology and Nongalactic Astrophysics

Classified by OpenAIRE into

arxiv: Astrophysics::Cosmology and Extragalactic Astrophysics, Computer Science::Programming Languages
We consider a hybrid scalar field which is non-minimally 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 to 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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