dsf.covariance.ingredients.galaxy_bias module

Galaxy-bias scripts for covariance calculations.

This module provides small utilities for constructing simple galaxy-bias inputs from tomographic lens-bin redshifts. The functions are intentionally independent of survey presets so they can be used with any tomography builder or user-supplied bin centers.

dsf.covariance.ingredients.galaxy_bias.linear_galaxy_bias(cosmo, z_bin_centers, *, bias_prefactor=1.0, round_decimals=4)[source]

Return linear galaxy bias evaluated at lens-bin centers.

The model uses a constant prefactor divided by the linear growth factor, evaluated at the scale factor corresponding to each lens-bin center.

Parameters:

  • cosmo (Cosmology) – CCL cosmology object.

  • z_bin_centers (ndarray[tuple[Any, ...], dtype[float64]] | list[float] | tuple[float, ...]) – Lens-bin center redshifts.

  • bias_prefactor (float) – Bias normalization prefactor. Defaults to 1.0.

  • round_decimals (int | None) – Optional number of decimals used to round the output. Set to None to return unrounded values.

Returns:

Galaxy-bias values evaluated at the input redshifts.

Return type:

ndarray[tuple[Any, …], dtype[float64]]