Halo bias in mixed dark matter cosmologies

Abstract

The large-scale distribution of cold dark matter halos is generally assumed to trace the large-scale distribution of matter. In a universe with multiple types of matter fluctuations, as is the case with massive neutrinos, the relation between the halo field and the matter fluctuations may be more complicated. We develop a method for calculating the bias factor relating fluctuations in the halo number density to fluctuations in the mass density in the presence of multiple fluctuating components of the energy density. In the presence of massive neutrinos we find a small but pronounced feature in the halo bias near the neutrino free-streaming scale. The neutrino feature is a small step with amplitude that increases with halo mass and neutrino mass density. The scale-dependent halo bias lessens the suppression of the small-scale halo power spectrum and should therefore weaken constraints on neutrino mass from the galaxy auto-power spectrum and correlation function. On the other hand, the feature in the bias is itself a novel signature of massive neutrinos that can be studied independently.

14 pages, 8 figures; v2: references added, typos corrected, minor changes to introduction; v3: minor changes to text, references added, matches PRD accepted version

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• Redshift-Space Distortions in Lagrangian Perturbation Theory
• Simulating nonlinear cosmological structure formation with massive neutrinos
• Spherical collapse in $\nu \Lambda CDM$
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• Cosmological direct detection of dark energy: non-linear structure formation signatures of dark energy scattering with visible matter
• Biased Tracers of Two Fluids in the Lagrangian Picture
• Neutrino Mass from Cosmology: Probing Physics Beyond the Standard Model
• Redshift space power spectrum beyond Einstein-de Sitter kernels
• Simulating cosmologies beyond $\Lambda$CDM with PINOCCHIO
• Cosmological constraints from the cross-correlation of DESI Luminous Red Galaxies with CMB lensing from Planck PR4 and ACT DR6
• Quintessential Scale Dependence from Separate Universe Simulations
• Cosmological parameter forecasts by a joint 2D tomographic approach to CMB and galaxy clustering
• Relativistic bias in neutrino cosmologies
• Neutrino winds on the sky
• Quantum algorithm for the Vlasov simulation of the large-scale structure formation with massive neutrinos
• The Effective Field Theory of Large Scale Structure for Mixed Dark Matter Scenarios
• Updated neutrino mass constraints from galaxy clustering and CMB lensing-galaxy cross-correlation measurements
• Slow neutrinos: non-linearity and momentum-space emulation
• Sound Mode and Scale-Dependent Growth in Two-Fluid Dynamical Dark Energy