Precise symbolic emulators of the linear and non-linear matter power spectra and for the conversion
By default, outside the k range tested in Bartlett et al. 2023,
we use the Eisenstein & Hu fit which includes baryons. This can be switched off by setting
extrapolate=False in the functions plin_emulated(), logF_max_precision() and
logF_fiducial().
To install the emulators and the dependencies, run the following
git clone [email protected]:DeaglanBartlett/symbolic_pofk.git
pip install symbolic_pofk
If you wish to use the pytorch code, the second line should be replaced with
pip install "symbolic_pofk[torch]"
If you wish to use the fortran version of the code, running the script
./setup_fortran.sh
will compile the fortran code and will produce a python wrapper for this.
We give an example for how to use the ΛCDM
linear emulator in examples/linear_example.py.
and the non-linear emulator in examples/halofit_example.py.
And we show how to use the emulators for the extended cosmology
(including neutrino masses, w0 and wa) in examples/syren_new_example.ipynb.
The example examples/fortran_example.py shows how to run the
fortran code with the python wrapper, and compares the difference
between the python and fortran implementations
(they are identical up to a fractional difference of
O(1e-6), which is much smaller than the error on the emulation).
If you use any of the emulators in this repository, please cite the following paper
@ARTICLE{symbolic_pofk,
author = {{Bartlett}, D.~J. and {Kammerer}, L. and {Kronberger}, G. and {Desmond}, H.
and {Ferreira}, P.~G. and {Wandelt}, B.~D. and {Burlacu}, B.
and {Alonso}, D. and {Zennaro}, M.},
title = "{A precise symbolic emulator for the linear matter power spectrum}",
journal = {arXiv e-prints},
keywords = {Astrophysics - Cosmology and Nongalactic Astrophysics},
year = 2023,
month = nov,
eid = {arXiv:2311.15865},
pages = {arXiv:2311.15865},
doi = {10.48550/arXiv.2311.15865},
archivePrefix = {arXiv},
eprint = {2311.15865},
primaryClass = {astro-ph.CO},
url = {https://arxiv.org/abs/2311.15865},
}
and if you use the non-linear emulator, please also cite the following paper
@ARTICLE{syren_halofit,
author = {{Bartlett}, D.~J. and {Wandelt}, B.~D. and {Zennaro}, M.
and {Ferreira}, P.~G. and {Desmond}, H.},
title = "{syren-halofit: A fast, interpretable, high-precision formula for
the LCDM nonlinear matter power spectrum}",
journal = {arXiv e-prints},
keywords = {Astrophysics - Cosmology and Nongalactic Astrophysics},
year = 2024,
month = feb,
eid = {arXiv:2402.17492},
pages = {arXiv:2402.17492},
doi = {10.48550/arXiv.2402.17492},
archivePrefix = {arXiv},
eprint = {2402.17492},
primaryClass = {astro-ph.CO},
url = {https://arxiv.org/abs/2402.17492},
}
and if you use the extended cosmologies, please cite
@ARTICLE{syren_new,
author = {{Sui}, C. and {Bartlett}, D.~J. and {Pandey}, S.
and {Desmond}, H. and {Ferreira}, P.~G. and {Wandelt}, B.~D.},
title = "{syren-new: Precise formulae for the linear and nonlinear matter power spectra
with massive neutrinos and dynamical dark energy}",
journal = {arXiv e-prints},
keywords = {Astrophysics - Cosmology and Nongalactic Astrophysics},
year = 2024,
month = oct,
eid = {arXiv:2410.14623},
pages = {arXiv:2410.14623},
doi = {10.48550/2410.14623},
archivePrefix = {arXiv},
eprint = {2410.14623},
primaryClass = {astro-ph.CO},
url = {https://arxiv.org/abs/2410.14623},
}
The software is available on the MIT licence:
Copyright 2024 Deaglan J. Bartlett
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
DJB is supported by the Simons Collaboration on "Learning the Universe".