This is a simple command line tool for printing the cosmological parameters or calculating the following cosmological quantities:
- Hubble parameter at a given redshift
- Age of the universe at a given redshift
- Redshift at a given age of the universe
- Comoving length to angular degree
- Angular degree to comoving length
- Angular area to comoving area
- Angular area to comoving volume
It is written in Python and uses the astropy library for cosmological calculations. The cosmologies supported currently are: WMAP7, WMAP9, Planck13, Planck15, Planck18.
To install CosmoCalc, clone this repository in a directory of your choice and add the following line to your startup bash script (e.g. .bashrc or .bash_profile or .zshrc):
alias cosmocalc="python {directory}/CosmoCalc/cosmocalc.py"
Now, from anywhere in your terminal, you can run the command cosmocalc to calculate cosmological quantities, such as:
cosmocalc --function "z_to_tage" --redshift 20 --cosmology Planck18
cosmocalc -f "z_to_tage" -z 20 -c Planck18
Both are equivalent and will calculate the age of the universe at redshift 20 using the Planck 2018 cosmology. You can also use the --help flag to see all available options: