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Title:
Cosmology with a time-variable cosmological 'constant'
Authors:
Peebles, P. J. E.; Ratra, Bharat
Affiliation:
AA(Princeton University, NJ), AB(Princeton University, NJ)
Publication:
Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 325, Feb. 15, 1988, p. L17-L20. NSF-supported research. (ApJL Homepage)
Publication Date:
02/1988
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
Astronomical Models, Cosmology, Dark Matter, Hubble Constant, Asymptotes, Curvature, Einstein Equations, Perturbation Theory, Quantum Theory
DOI:
10.1086/185100
Bibliographic Code:
1988ApJ...325L..17P

Abstract

If the potential V(phi) of the scalar field that drove inflation had a power-law tail at large phi, V ≈ phi-α, the mass density, rhophi, associated with phi would act like a cosmological constant that decreases with time less rapidly than the mass densities of matter and radiation. If rhophi were appreciable at the present epoch it could help reconcile the low dynamical estimates of the mean mass density with the negligibly small space curvature preferred by inflation.

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