https://doi.org/10.1140/epjc/s10052-009-0865-x
Regular Article - Theoretical Physics
Cosmic-coincidence problem and variable constants of physics
1
Center for Advanced Mathematics and Physics, National University of Sciences and Technology, Peshawar Road, Rawalpindi, 46000, Pakistan
2
Department of Mathematics, Jadavpur University, Kolkata, 700032, India
3
Department of Physics, Netaji Nagar College for Women, Regent Estate, Kolkata, 700092, India
* e-mail: mjamil@camp.edu.pk
Received:
24
September
2008
Revised:
8
December
2008
Published online:
4
February
2009
The standard model of cosmology is investigated using a time-dependent cosmological constant Λ and Newton gravitational constant G. The total energy content is described by the modified Chaplygin gas equation of state. It is found that the time-dependent constants coupled with the modified Chaplygin gas interpolate between the earlier matter to the later dark-energy dominated phase of the universe. We also achieve a convergence of the parameter ω→−1, almost at the present time. Thus our model fairly alleviates the cosmic-coincidence problem, which demands ω=−1 at the present time.
© Springer-Verlag, 2009
