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

Ruth A. Daly | Zendy; S. G. Djorgovski | Zendy

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

Author(s) -

Ruth A. Daly,

S. G. Djorgovski

Publication year - 2004

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/422673

Subject(s) - dark energy , physics , redshift , cosmology , deceleration parameter , cosmic microwave background , metric expansion of space , equation of state , astrophysics , baryon acoustic oscillations , general relativity , universe , quasar , physical cosmology , theoretical physics , galaxy , quantum mechanics , anisotropy

Understanding of the nature of dark energy, which appears to drive theexpansion of the universe, is one of the central problems of physical cosmologytoday. In an earlier paper [Daly & Djorgovski (2003)] we proposed a novelmethod to determine the expansion rate and the deceleration parameter in alargely model-independent way, directly from the data on coordinate distances.Here we expand this methodology to include measurements of the pressure of darkenergy, its normalized energy density, and the equation of state parameter asfunctions of redshift. We then apply this methodology to a new, combined dataset of distances to supernovae and radio galaxies.Comment: 27 pages, 8 figures. Will appear in the Astrophysical Journal, v612, September 10, 200

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