Scale-dependent Galaxy Bias

Abstract

We present a simple heuristic model to demonstrate how feedback related to the galaxy formation process can result in a scale-dependent bias of mass versus light, even on very large scales. The model invokes the idea that galaxies form initially in locations determined by the local density field, but the subsequent formation of galaxies is also influenced by the presence of nearby galaxies that have already formed. The form of bias that results possesses some features that are usually described in terms of stochastic effects, but our model is entirely deterministic once the density field is specified. Features in the large-scale galaxy power spectrum (such as wiggles that might in an extreme case mimic the effect of baryons on the primordial transfer function) could, at least in principle, arise from spatial modulations of the galaxy formation process that arise naturally in our model. We also show how this fully deterministic model gives rise to apparently stochasticity in the galaxy distribution.

14 pages, 2 figures, typos corrected, discussion added and references corrected; matches version accepted by JCAP

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• Clustering of Low-Redshift (z <= 2.2) Quasars from the Sloan Digital Sky Survey
• Large-Scale Anisotropic Correlation Function of SDSS Luminous Red Galaxies
• An EFT description of galaxy intrinsic alignments
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• An $n$-th order Lagrangian Forward Model for Large-Scale Structure
• Constraints on quintessence scalar field models using cosmological observations
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• Multi-Component Dark Matter in a Non-Abelian Dark Sector
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