Scale Factor Dependent Equations of State for Curvature Inspired Dark Energy, Phantom Barrier and Late Cosmic Acceleration

Aug, 2006
4 pages
Published in:
  • Phys.Lett.B 643 (2006) 1-4
e-Print:

Citations per year

2006201120162021202402468
Abstract: (Elsevier)
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−1 and wde<−1 for a>aw , showing a transition from non-phantom to phantom phase at a=aw
  • 98.80.Cq
  • dark energy
  • dark matter
  • equation of state
  • phantom
  • gravitation
  • derivative: high
  • expansion: acceleration