Modeling Biased Tracers at the Field Level

Understand

In this paper we test the perturbative halo bias model at the field level.

• The advantage of this approach is that any analysis can be done without sample variance if the same initial conditions are used in simulations and perturbation theory calculations.
• We write the bias expansion in terms of modified bias operators in Eulerian space, designed such that the large bulk flows are automatically resummed and not treated perturbatively.
• Using these operators, the bias model accurately matches the Eulerian density of halos in N-body simulations.