Can the Geometric Test Probe the Cosmic Equation of State?
Abstract
The feasibility of the geometric test as a probe of the cosmic equation of state of the dark energy is discussed assuming the future Two Degree Field QSO sample. We examine the sensitivity of the QSO twopoint correlation functions, which are theoretically computed incorporating the light cone effect and the redshift distortions, as well as the nonlinear effect, to a bias model whose evolution is phenomenologically parameterized. It is shown that the correlation functions are sensitive to a mean amplitude of the bias and not to the speed of the redshift evolution. We will also demonstrate that an optimistic geometric test could suffer from the possibility that a signal from the cosmological model can be confused with that from a stochastic character of the bias.
 Publication:

The Astrophysical Journal
 Pub Date:
 March 2001
 DOI:
 10.1086/319135
 arXiv:
 arXiv:astroph/0101172
 Bibcode:
 2001ApJ...549L..15Y
 Keywords:

 Cosmology: Theory;
 Cosmology: Dark Matter;
 Cosmology: LargeScale Structure of Universe;
 Galaxies: Quasars: General;
 Astrophysics
 EPrint:
 11 pages, including 3 figures, accepted for publication in ApJL