2009/01/24 by Mahmood Roshan, Maryam Nouri, Fatimah Shojai
Physics and Astronomy · #Advanced Differential Geometry Research #Black Holes and Theoretical Physics #Classical mechanics #Cosmology and Gravitation Theories #Optics #Physics #Speed of light (cellular automaton) #Theoretical physics #gr-qc
paper · pdf · doi:10.1016/j.physletb.2009.01.042
published as Phys.Lett.B672:197-202,2009 · 16 pages, final version accepted for publication in Physics Letters B
openalex publication_date 2009/01/24 · arxiv created 2009/02/01 · arxiv updated 2010/04/23 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We consider scalar–tensor theory for describing varying speed of light in a spatially flat FRW space–time. We find some exact solutions in the metric and Palatini formalisms. Also we examine the dynamics of this theory by dynamical system method assuming a ΛCDM background and we find some exact solutions by considering the character of critical points of the theory in both formalisms. We show that for any attractor the form of non-minimal coupling coefficient is quadratic in terms of the scalar field Ψ. Also we show that only attractors of the de Sitter era satisfy the horizon criteria.