TY - JOUR

T1 - Can the geometric test probe the cosmic equation of state?

AU - Yamamoto, Kazuhiro

AU - Nishioka, Hiroaki

N1 - Funding Information:
We thank Y. Kojima, A. Taruya, and T. Chiba for useful discussion and comment. This work is supported by the Inamori Foundation.

PY - 2001/3/1

Y1 - 2001/3/1

N2 - 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 two-point 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.

AB - 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 two-point 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.

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U2 - 10.1086/319135

DO - 10.1086/319135

M3 - Article

AN - SCOPUS:0041027149

VL - 549

SP - L15-L19

JO - Astrophysical Journal

JF - Astrophysical Journal

SN - 0004-637X

IS - 1 PART 2

ER -