lfkit.luminosity_functions.parameter_models

luminosity function parameter-evolution models for LFKit.

This module provides helper functions for evaluating redshift-dependent luminosity function parameters such as phi_star(z), M_star(z), and alpha(z).

These helpers are used by luminosity function models that allow parameter evolution with redshift. They evaluate only the parameters, not the full luminosity function.

Built-in options include constant evolution and simple linear forms commonly used in luminosity function analyses.

Functions

alpha_constant(z, *, alpha)	Return a constant faint-end slope over redshift.
alpha_linear(z, *, alpha_0, alpha_1[, z_ref])	Return a faint-end slope that varies linearly with redshift.
available_lf_parameter_models()	Return available luminosity function parameter-evolution models.
evaluate_lf_parameters(z, *[, phi_model, ...])	Evaluate luminosity function parameters at redshift z.
get_parameter_model(model_name, registry, *, ...)	Return a registered luminosity function parameter model.
m_star_constant(z, *, m_star)	Return a constant characteristic magnitude over redshift.
m_star_linear_q(z, *, m_0_star, q[, z_ref])	Return a characteristic magnitude with luminosity evolution.
phi_star_constant(z, *, phi_star)	Return a constant Schechter normalization over redshift.
phi_star_linear_p(z, *, phi_0_star, p)	Return a Schechter normalization with density evolution.
register_alpha_model(name, model, *[, overwrite])	Register an alpha evolution model.
register_m_star_model(name, model, *[, ...])	Register an M_star evolution model.
register_phi_star_model(name, model, *[, ...])	Register a phi_star evolution model.