Distances in inhomogeneous quintessence cosmology

Details Distances in inhomogeneous quintessence cosmology Distances in inhomogeneous quintessence cosmology

2001-02-28

arxiv.org/abs/astro-ph/0102486v1

Mon.Not.Roy.Astron.Soc. 327 (2001) 517

Astronomy and Astrophysics

Astrophysics

24 pages, 9 ps figures

Scientific paper

10.1046/j.1365-8711.2001.04731.x

We investigate the properties of cosmological distances in locally inhomogeneous universes with pressureless matter and dark energy (quintessence), with constant equation of state. We give exact solutions for angular diameter distances in theempty beam approximation. In this hypothesis, the distance-redshift equation is derived fron the multiple lens-plane theory. The case of a flat universe is considered with particular attention. We show how this general scheme makes distances degenerate with respect to w_X and the smoothness parameters, alpha, accounting for the homogeneously distributed fraction of energy of the i-components. We analyse how this degeneracy influences the critical redshift where the angular diameter distance takes its maximum, and put in evidence future prospects for measuring the smoothness parameter of the pressureless matter, alpha_M.

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