A python package for modelling baryonic effects in cosmological simulations.
The package provides conatins emulators to model the suppression in the power spectrum due to baryonic feedback processes. These emulators are based on the baryonification model [1], where gravity-only N-body simulation results are manipulated to include the impact of baryonic feedback processes.
To install the package from source, one should clone this package running the following::
git clone https://github.com/sambit-giri/BCMemu.git
To install the package in the standard location, run the following in the root directory::
python setup.py install
In order to install it in a separate directory::
python setup.py install --home=directory
One can also install it using pip by running the following command::
pip install git+https://github.com/sambit-giri/BCMemu.git
The dependencies should be installed automatically during the installation process. If they fail for some reason, you can install them manually before installing BCMemu. The list of required packages can be found in the requirements.txt file present in the root directory.
For testing, one can use pytest or nosetests. Both packages can be installed using pip. To run all the test script, run the either of the following::
python -m pytest tests
nosetests -v
Script to get the baryonic power suppression.
import BCMemu
bfcemu = BCMemu.BCM_7param(Ob=0.05, Om=0.27)
bcmdict = {'log10Mc': 13.32,
'mu' : 0.93,
'thej' : 4.235,
'gamma' : 2.25,
'delta' : 6.40,
'eta' : 0.15,
'deta' : 0.14,
}
z = 0
k_eval = 10**np.linspace(-1,1.08,50)
p_eval = bfcemu.get_boost(z, bcmdict, k_eval)Visualising the output.
import matplotlib.pyplot as plt
plt.semilogx(k_eval, p_eval, c='C0', lw=3)
plt.axis([1e-1,12,0.73,1.04])
plt.yticks(fontsize=14)
plt.xticks(fontsize=14)
plt.xlabel(r'$k$ (h/Mpc)', fontsize=14)
plt.ylabel(r'$\frac{P_{\rm DM+baryon}}{P_{\rm DM}}$', fontsize=21)
plt.tight_layout()
plt.show()
If you find any bugs or unexpected behavior in the code, please feel free to open a Github issue. The issue page is also good if you seek help or have suggestions for us.
[1] Schneider, A., Teyssier, R., Stadel, J., Chisari, N. E., Le Brun, A. M., Amara, A., & Refregier, A. (2019). Quantifying baryon effects on the matter power spectrum and the weak lensing shear correlation. Journal of Cosmology and Astroparticle Physics, 2019(03), 020.