Can the geometric test probe the cosmic equation of state?

Kazuhiro Yamamoto, Hiroaki Nishioka

Research output: Contribution to journalArticle

7 Citations (Scopus)

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 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.

Original languageEnglish
Pages (from-to)L15-L19
JournalAstrophysical Journal
Volume549
Issue number1 PART 2
DOIs
Publication statusPublished - Mar 1 2001
Externally publishedYes

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All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

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