cosfunc 0.1.1

Cosmological functions for astrophysics calculations

Cosfunc - Cosmological Functions

A Python package providing essential cosmological functions for astrophysics calculations.

Features

• Hubble parameter calculations
• Cosmological distance functions
• Hydrogen number density
• Time-redshift derivatives
• Configurable cosmological parameters

Installation

pip install cosfunc

Usage

from cosfunc import Set_Cosmology, H, n_H, dtdz

# Set cosmological parameters (optional, uses default if not set)
Set_Cosmology(h0=0.674, om_0=0.315)

# Calculate Hubble parameter at redshift z=7
hubble = H(7.0)
print(f"H(z=7) = {hubble}")

# Calculate hydrogen number density
density = n_H(0.5)  # overdensity delta = 0.5
print(f"n_H = {density}")

# Time derivative with respect to redshift
dt = dtdz(7.0)
print(f"dt/dz = {dt}")

Functions

• Set_Cosmology(h0, om_0): Set cosmological parameters
• E(z): Dimensionless Hubble parameter
• H(z): Hubble parameter at redshift z
• n_H(delta): Hydrogen number density
• dtdz(z): Time derivative with respect to redshift

Default Parameters

• h = 0.674 (Hubble parameter)
• Ω_m = 0.315 (Matter density)
• Ω_b = 0.0224 / h² (Baryon density)

License

MIT License