2006/08/31 by S. K. Srivastava · 1 citation
Physics and Astronomy · #Black Holes and Theoretical Physics #Cosmology and Gravitation Theories #Relativity and Gravitational Theory #astro-ph #gr-qc #hep-th
paper · pdf · doi:10.1016/j.physletb.2006.10.035
published as Phys.Lett. B643 (2006) 1-4 · 10 PAGES. To appear in Phys. Lett. B
arxiv created 2006/10/16 · openalex publication_date 2006/11/01 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/02
Here, it is found that dark energy and dark matter emerge from the gravitational sector, if non-linear term of scalar curvature is added to Einstein–Hilbert Lagrangian. An equation of state for dark energy, having the form pde=−ρde+f(a) (with pde (ρde) being the pressure (density) for dark energy, f(a) being a function of scale factor a(t) and t being the cosmic time) is explored. Interestingly, this equation of state leads to a phantom barrier wde=pde/ρde=−1 at a=aw. It is found that when a<aw,wde>−1 and wde<−1 for a>aw, showing a transition from non-phantom to phantom phase at a=aw<a0 (a0 being the current scale factor of the universe).