Cosmological dynamics of a hybrid chameleon scenario
- Publisher: Hindawi Publishing Corporation
Advances in High Energy Physics
(issn: 1687-7357, eissn: 1687-7365)
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.