Cosmological leverage from the matter power spectrum in the presence of baryon and nonlinear effects

被引：3

作者：

Bielefeld, Jannis ^{[1
]}

Huterer, Dragan ^{[2
]}

Linder, Eric V. ^{[3
,4
]}

机构：

[1] Dartmouth Coll, Dept Phys & Astron, Hanover, NH 03755 USA

[2] Univ Michigan, Dept Phys, Ann Arbor, MI 48109 USA

[3] Univ Calif Berkeley, Berkeley Ctr Cosmol Phys, Berkeley, CA 94720 USA

[4] Univ Calif Berkeley, Berkeley Lab, Berkeley, CA 94720 USA

来源：

JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS | 2015年 / 05期

基金：

美国国家科学基金会;

关键词：

cosmological parameters from LSS; power spectrum; neutrino masses from cosmology; HALO MODEL; IMPACT;

D O I：

10.1088/1475-7516/2015/05/023

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We investigate how the use of higher wavenumbers (smaller scales) in the galaxy clustering power spectrum influences cosmological constraints. We take into account uncertainties from nonlinear density fluctuations, (scale dependent) galaxy bias, and baryonic effects. Allowing for substantially model independent uncertainties through separate fit par ameters in each wavenumber bin that also allow for the redshift evolution, we quantify strong gains in dark energy and neutrino mass leverage with increasing maximum wavenumber,despite marginalizing over numerous (up to 125) extra fit parameters. The leverage is due to not only an increased number of modes but, more significantly, breaking of degeneracies beyond the linear regime.

引用

页数：16

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