Early cosmological models in Lyra's geometry

Details Early cosmological models in Lyra's geometry Early cosmological models in Lyra's geometry

Mar 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001ap%26ss.275..377s&link_type=abstract

Astrophysics and Space Science, v. 275, Issue 4, p. 377-383 (2001).

Astronomy and Astrophysics

Astrophysics

1

Scientific paper

A spatially homogeneous and isotropic Robertson-Walker model with zero-curvature of the universe is studied within the frame-work of Lyra's manifold. The gauge-function φ_μ in Lyra's manifold is taken to be time-dependent. Exact solutions of Einstein equations are obtained for two different early phases of the universe viz. Inflationary phase and radiation-dominated phase by using `gamma-law' equation of state p = (γ - 1) ρ. The γ-index, describing the material content, varies continuously with cosmic time so that in the course of its evolution, the universe goes through a transition from an inflationary phase to a radiation-dominated phase. The physical properties of the models are also discussed.

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