Precision measurement of the local bias of dark matter halos

We present accurate measurements of the linear, quadratic, and cubic local bias of dark matter halos, using curved 'separate universe' N-body simulations which effectively incorporate an infinite-wavelength overdensity. This can be seen as an exact implementation of the peak-background spl...

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Bibliographic Details
Published inJournal of cosmology and astroparticle physics Vol. 2016; no. 2; p. 18
Main Authors Lazeyras, Titouan, Wagner, Christian, Baldauf, Tobias, Schmidt, Fabian
Format Journal Article
LanguageEnglish
Published United States 08.02.2016
Subjects
ACCURACY
ASTROPHYSICS, COSMOLOGY AND ASTRONOMY
COMPARATIVE EVALUATIONS
COMPUTERIZED SIMULATION
DIAGRAMS
ENERGY SPECTRA
MASS
NONLINEAR PROBLEMS
NONLUMINOUS MATTER
RED SHIFT
STOCHASTIC PROCESSES
UNIVERSE
WAVELENGTHS
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Summary:We present accurate measurements of the linear, quadratic, and cubic local bias of dark matter halos, using curved 'separate universe' N-body simulations which effectively incorporate an infinite-wavelength overdensity. This can be seen as an exact implementation of the peak-background split argument. We compare the results with the linear and quadratic bias measured from the halo-matter power spectrum and bispectrum, and find good agreement. On the other hand, the standard peak-background split applied to the Sheth and Tormen (1999) and Tinker et al. (2008) halo mass functions matches the measured linear bias parameter only at the level of 10%. The prediction from the excursion set-peaks approach performs much better, which can be attributed to the stochastic moving barrier employed in the excursion set-peaks prediction. We also provide convenient fitting formulas for the nonlinear bias parameters b{sub 2}(b{sub 1}) and b{sub 3}(b{sub 1}), which work well over a range of redshifts.
ISSN:1475-7516
1475-7516
DOI:10.1088/1475-7516/2016/02/018