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Title: Galaxy power-spectrum responses and redshift-space super-sample effect

Abstract

As a major source of cosmological information, galaxy clustering is susceptible to long-wavelength density and tidal fluctuations. These long modes modulate the growth and expansion rate of local structures, shifting them in both amplitude and scale. These effects are often named the growth and dilation effects, respectively. In particular the dilation shifts the baryon acoustic oscillation (BAO) peak and breaks the assumption of the Alcock-Paczynski (AP) test. This cannot be removed with reconstruction techniques because the effect originates from long modes outside the survey. In redshift space, the long modes generate a large-scale radial peculiar velocity that affects the redshift-space distortion (RSD) signal. We compute the redshift-space response functions of the galaxy power spectrum to long density and tidal modes at leading order in perturbation theory, including both the growth and dilation terms. We validate these response functions against measurements from simulated galaxy mock catalogs. As one application, long density and tidal modes beyond the scale of a survey correlate various observables leading to an excess error known as the super-sample covariance, and thus weaken their constraining power. We quantify the super-sample effect on BAO, AP, and RSD measurements, and study its impact on current and future surveys.

Authors:
 [1];  [2];  [3]
  1. Univ. of California, Berkeley, CA (United States). Berkeley Center for Cosmological Physics, Dept. of Phyiscs, & Lawrence Berkeley National Lab.; Univ. of Tokyo (Japan). Kavli Inst. for the Physics and Mathematics of the Universe (WPI), UTIAS
  2. Inst. for Advanced Study, Princeton, NJ (United States)
  3. Univ. of California, Berkeley, CA (United States). Dept. of Physics; Univ. of California, Berkeley, CA (United States). Berkeley Center for Cosmological Physics; Univ. of California, Berkeley, CA (United States). Lawrence Berkeley National Lab.
Publication Date:
Research Org.:
Lawrence Berkeley National Laboratory-National Energy Research Scientific Computing Center
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1523615
Grant/Contract Number:  
AC02-05CH11231
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Cosmology and Astroparticle Physics
Additional Journal Information:
Journal Volume: 2018; Journal Issue: 02; Journal ID: ISSN 1475-7516
Country of Publication:
United States
Language:
English

Citation Formats

Li, Yin, Schmittfull, Marcel, and Seljak, Uroš. Galaxy power-spectrum responses and redshift-space super-sample effect. United States: N. p., 2018. Web. doi:10.1088/1475-7516/2018/02/022.
Li, Yin, Schmittfull, Marcel, & Seljak, Uroš. Galaxy power-spectrum responses and redshift-space super-sample effect. United States. doi:10.1088/1475-7516/2018/02/022.
Li, Yin, Schmittfull, Marcel, and Seljak, Uroš. Thu . "Galaxy power-spectrum responses and redshift-space super-sample effect". United States. doi:10.1088/1475-7516/2018/02/022. https://www.osti.gov/servlets/purl/1523615.
@article{osti_1523615,
title = {Galaxy power-spectrum responses and redshift-space super-sample effect},
author = {Li, Yin and Schmittfull, Marcel and Seljak, Uroš},
abstractNote = {As a major source of cosmological information, galaxy clustering is susceptible to long-wavelength density and tidal fluctuations. These long modes modulate the growth and expansion rate of local structures, shifting them in both amplitude and scale. These effects are often named the growth and dilation effects, respectively. In particular the dilation shifts the baryon acoustic oscillation (BAO) peak and breaks the assumption of the Alcock-Paczynski (AP) test. This cannot be removed with reconstruction techniques because the effect originates from long modes outside the survey. In redshift space, the long modes generate a large-scale radial peculiar velocity that affects the redshift-space distortion (RSD) signal. We compute the redshift-space response functions of the galaxy power spectrum to long density and tidal modes at leading order in perturbation theory, including both the growth and dilation terms. We validate these response functions against measurements from simulated galaxy mock catalogs. As one application, long density and tidal modes beyond the scale of a survey correlate various observables leading to an excess error known as the super-sample covariance, and thus weaken their constraining power. We quantify the super-sample effect on BAO, AP, and RSD measurements, and study its impact on current and future surveys.},
doi = {10.1088/1475-7516/2018/02/022},
journal = {Journal of Cosmology and Astroparticle Physics},
number = 02,
volume = 2018,
place = {United States},
year = {2018},
month = {2}
}

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