Coasting cosmologies with time dependent cosmological constant

Abstract

The effect of a time dependent cosmological constant is considered in a family of scalar tensor theories. Friedmann-Robertson-Walker cosmological models for vacumm and perfect fluid matter are found. They have a linear expansion factor, the so called coasting cosmology, the gravitational "constant" decreace inversely with time; this model satisfy the Dirac hipotesis. The cosmological "constant" decreace inversely with the square of time, therefore we can have a very small value for it at present time.

7 pages, latex file (ijmpal macro), accepted for publication in Int. Mod. Phys. A

References in corpus (3)

• The Age Of Globular Clusters In Light Of Hipparcos: Resolving the Age Problem?
• Spontaneous Decay of the Effective Cosmological Constant
• Ruling out a critical density baryonic universe

Cited by in corpus (4)

• Estimated Age of the Universe in Fractional Cosmology
• An analysis of cosmological perturbations in hydrodynamical and field representations
• Required Conditions for Late Time Acceleration and Early Time Deceleration in Generalized Scalar-Tensor Theories
• The $R_{\mathrm{h}}=ct$ universe and quintessence