Scale-dependent halo bias from scale-dependent growth

Details Scale-dependent halo bias from scale-dependent growth Scale-dependent halo bias from scale-dependent growth

2010-12-06

arxiv.org/abs/1012.1335v2

Phys.Rev.D83:063511,2011

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

14 pages, submitted to Phys. Rev. D

Scientific paper

10.1103/PhysRevD.83.063511

We derive a general expression for the large-scale halo bias, in theories with a scale-dependent linear growth, using the excursion set formalism. Such theories include modified gravity models, and models in which the dark energy clustering is non-negligible. A scale dependence is imprinted in both the formation and evolved biases by the scale-dependent growth. Mergers are accounted for in our derivation, which thus extends earlier work which focused on passive evolution. There is a simple analytic form for the bias for those theories in which the nonlinear collapse of perturbations is approximately the same as in general relativity. As an illustration, we apply our results to a simple Yukawa modification of gravity, and use SDSS measurements of the clustering of luminous red galaxies to constrain the theory's parameters.

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