2014/01/31 by Amir Pouyan Khosravi Karchi, Hossein Shojaie · 3 citations
Physics and Astronomy · #Black Holes and Theoretical Physics #Cosmology #Cosmology and Gravitation Theories #Coupling (piping) #Dark energy #Deceleration parameter #Field (mathematics) #Field equation #Friedmann–Lemaître–Robertson–Walker metric #Phase portrait #Quantum and Classical Electrodynamics #Scalar field #Universe #astro-ph.CO #gr-qc
paper · pdf · doi:10.1142/s0218271816500450
published in International Journal of Modern Physics D 25(04), 1650045 (World Scientific) · 13 pages, 7 figures, to appear in IJMPD
openalex publication_date 2016/02/25 · arxiv created 2016/03/15 · arxiv updated 2016/03/16 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
In this paper, the field equations of a chameleon field in which the matter Lagrangian term is a general function of the scalar field as well as matter field, are derived. The equations are then expressed in Friedmann–Lemaître–Robertson–Walker (FLRW) framework and the associated phase portraits and a power law solution are discussed in details. It is shown that why nonminimal coupling between the chameleon and matter fields leads to an energy transfer between the fields, which consequently affects the expansion rate of the universe. The transfer direction is determined by the second law of thermodynamics. The solution indicates that an accelerating expansion of the universe can be described as a result of the energy flow from the chameleon field to matter field.