Characteristic scales of baryon acoustic oscillations from perturbation theory: Nonlinearity and redshift-space distortion effects

Takahiro Nishimichi, Hiroshi Ohmuro, Masashi Nakamichi, Atsushi Taruya, Kazuhiro Yahata, Akihito Shirata, Shun Saito, Hidenori Nomura, Kazuhiro Yamamoto, Yasushi Suto

Research output: Contribution to journalArticle

41 Citations (Scopus)

Abstract

An acoustic oscillation of the primeval photon-baryon fluid around the decoupling time imprints a characteristic scale in the galaxy distribution today, known as the baryon acoustic oscillation (BAO) scale. Several ongoing and/or future galaxy surveys aim to detect and precisely determine the BAO scale so as to trace the expansion history of the universe. We consider nonlinear and redshift-space distortion effects on the shifts of the BAO scale in k-space using perturbation theory. The resulting shifts are indeed sensitive to different choices for the definition of the BAO scale, which needs to be kept in mind in the data analysis. We present a toy model to explain the physical behavior of the shifts. We find that the BAO scale defined as in Percival et al. (2007, ApJ, 657, 51) indeed shows very small shifts (≲ 1%) relative to the prediction in linear theory in real space. The shifts can be predicted accurately for scales where perturbation theory is reliable.

Original languageEnglish
Pages (from-to)1049-1060
Number of pages12
JournalPublications of the Astronomical Society of Japan
Volume59
Issue number6
DOIs
Publication statusPublished - 2007
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

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