Cosmological dynamics of a hybrid chameleon scenario

Article, Preprint English OPEN
Nozari, Kourosh ; Rashidi, N. (2013)
  • Publisher: Hindawi Publishing Corporation
  • Journal: Advances in High Energy Physics (issn: 1687-7357, eissn: 1687-7365)
  • Related identifiers: doi: 10.1155/2013/803735
  • Subject: General Relativity and Quantum Cosmology | Physics | QC1-999 | Article Subject | Astrophysics - Cosmology and Nongalactic Astrophysics
    arxiv: Computer Science::Programming Languages | Astrophysics::Cosmology and Extragalactic Astrophysics

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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