Aemulus ν: Precision halo mass functions in wνCDM cosmologies

This package contains the halo mass function emulator described in [2410.00913] for cluster mass scales ($\gtrsim 10^{13}M_\odot / h$) up to redshift $z \eqsim 2$ with support for the whole space of $w\nu {\rm CDM}$ cosmologies allowed by current data. This emulator is built from measurements of halo abundances in the Aemulus $\nu$ suite of simulations described in [2303.09762].

The repository with all the numerical studies and code to build this emulator can be found here

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If you have any questions at all about the code, I'm always open to chat, just let me know at delon@stanford.edu

Dependencies

• numpy
• scipy
• classy
• pytest

Installation

Download this repository and in the base directory run

python setup.py install

To validate your installation, you can run

pytest

Getting Started

For a thorough introduction, see Tutorial.ipynb. For something simple:

from aemulusnu_hmf.emulator import dn_dM
cosmology = {'ns': 0.97,
 'H0': 67.0,
 'w0': -1.0,
 'ombh2': 0.0223,
 'omch2': 0.12,
 'nu_mass_ev': 0.07,
 '10^9 As': 2.1}

Ms = np.logspace(12, 16, 100) #in units of Msol / h
mass_function = dn_dM(cosmology, Ms, a = 1.0) #in units of h^4 / (Mpc^3  Msol)

Citation

If you use the Aemulus $\nu$ halo mass function emulator, please cite [2410.00913] and [2303.09762]

@article{Shen:2024cio,
    author = "Shen, Delon and Kokron, Nickolas and DeRose, Joseph and Tinker, Jeremy and Wechsler, Risa H. and Banerjee, Arka",
    collaboration = "Aemulus",
    title = "{Aemulus \ensuremath{\nu}: precision halo mass functions in w\ensuremath{\nu}CDM cosmologies}",
    eprint = "2410.00913",
    archivePrefix = "arXiv",
    primaryClass = "astro-ph.CO",
    doi = "10.1088/1475-7516/2025/03/056",
    journal = "JCAP",
    volume = "03",
    pages = "056",
    year = "2025"
}

@article{DeRose:2023dmk,
    author = "DeRose, Joseph and Kokron, Nickolas and Banerjee, Arka and Chen, Shi-Fan and White, Martin and Wechsler, Risa and Storey-Fisher, Kate and Tinker, Jeremy and Zhai, Zhongxu",
    title = "{Aemulus \ensuremath{\nu}: precise predictions for matter and biased tracer power spectra in the presence of neutrinos}",
    eprint = "2303.09762",
    archivePrefix = "arXiv",
    primaryClass = "astro-ph.CO",
    doi = "10.1088/1475-7516/2023/07/054",
    journal = "JCAP",
    volume = "07",
    pages = "054",
    year = "2023"
}