Direct Determination of the Kinematics of the Universe and Properties of the Dark Energy as Functions of Redshift

Details Direct Determination of the Kinematics of the Universe and Properties of the Dark Energy as Functions of Redshift Direct Determination of the Kinematics of the Universe and Properties of the Dark Energy as Functions of Redshift

2004-03-29

arxiv.org/abs/astro-ph/0403664v2

Astrophys.J. 612 (2004) 652-659

Astronomy and Astrophysics

Astrophysics

27 pages, 8 figures. Will appear in the Astrophysical Journal, v612, September 10, 2004

Scientific paper

10.1086/422673

Understanding of the nature of dark energy, which appears to drive the expansion of the universe, is one of the central problems of physical cosmology today. In an earlier paper [Daly & Djorgovski (2003)] we proposed a novel method to determine the expansion rate and the deceleration parameter in a largely model-independent way, directly from the data on coordinate distances. Here we expand this methodology to include measurements of the pressure of dark energy, its normalized energy density, and the equation of state parameter as functions of redshift. We then apply this methodology to a new, combined data set of distances to supernovae and radio galaxies.

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