ReACTemu-f(R)

ReACTemu-f(R) is an emulator of the nonlinear correction to the matter power spectrum for f(R) gravity with massive neutrinos. It is built using the CosmoPower neural emulation framework to emulate the predictions of the ReACT code.

Since ReACTemu-f(R) is a CosmoPower network, the syntax to use this emulator is the same as any other CosmoPower emulator. We report an example below, and refer to the CosmoPower repository, documentation and original CosmoPower paper for details on the emulation framework.

Installation

To use ReACTemu-f(R) you should first install CosmoPower. This is most conveniently done inside a Conda environment:

conda create -n cp_env python=3.7 pip && conda activate cp_env

Once inside the environment, you can install CosmoPower with

pip install cosmopower

Using ReACTemu-f(R)

To use ReACTemu-f(R) you can simply instantiate a cosmopower_NN class and load the .pkl file storing the emulator:

import cosmopower as cp

# load ReACTemu-f(R)
cp_nn = cp.cosmopower_NN(restore=True, 
                         restore_filename='/path/to/reactemu-fr')

# create a dict of cosmological parameters
params_fr =  {'Omega_m':        [0.3164],
              'Omega_b':        [0.04966],
              'H_0':            [67.1],
              'n_s':            [0.9647],
              'A_s':            [2.1031e-9],
              'f_R0':           [1e-6],
              'Omega_nu':       [0.0014],
              'z':              [0.],
              }

# predictions (= forward pass through the network) -> 10^predictions
spectra = cp_nn.ten_to_predictions_np(params_fr)

Citation

If you use ReACTemu-f(R) please cite its release paper as well as the CosmoPower release paper:

@article{SpurioMancini2023,
    author = "Spurio Mancini, A. and Bose, B.",
    title = "{On the degeneracies between baryons, massive neutrinos and f(R) gravity in Stage IV cosmic shear analyses}",
    eprint = "2305.06350",
    archivePrefix = "arXiv",
    primaryClass = "astro-ph.CO",
    month = "5",
    year = "2023"
}

@article{SpurioMancini2022,
         title={CosmoPower: emulating cosmological power spectra for accelerated Bayesian inference from next-generation surveys},
         volume={511},
         ISSN={1365-2966},
         url={http://dx.doi.org/10.1093/mnras/stac064},
         DOI={10.1093/mnras/stac064},
         number={2},
         journal={Monthly Notices of the Royal Astronomical Society},
         publisher={Oxford University Press (OUP)},
         author={Spurio Mancini, Alessio and Piras, Davide and Alsing, Justin and Joachimi, Benjamin and Hobson, Michael P},
         year={2022},
         month={Jan},
         pages={1771–1788}
         }

License

ReACTemu-f(R) is released under the GPL-3 license (see LICENSE) subject to the non-commercial use condition (see LICENSE_EXT).

ReACTemu-f(R)
Copyright (C) 2023 A. Spurio Mancini & contributors

This program is released under the GPL-3 license (see LICENSE),
subject to a non-commercial use condition (see LICENSE_EXT).

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.