The European Physical Journal C

, Volume 60, Issue 1, pp 149–156 | Cite as

Cosmic-coincidence problem and variable constants of physics

Regular Article - Theoretical Physics

Abstract

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.

Keywords

Dark Energy Cosmological Parameter Phantom Energy Total Energy Content Negative Constant Deceleration Parameter 

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Copyright information

© Springer-Verlag / Società Italiana di Fisica 2009

Authors and Affiliations

  1. 1.Center for Advanced Mathematics and PhysicsNational University of Sciences and TechnologyRawalpindiPakistan
  2. 2.Department of MathematicsJadavpur UniversityKolkataIndia
  3. 3.Department of PhysicsNetaji Nagar College for WomenKolkataIndia

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