An emulator for the Lyman-α forest in beyond-ΛCDM cosmologies
Abstract
Interpreting observations of the Lyman-α forest flux power spectrum requires interpolation between a small number of expensive simulations. We present a Gaussian process emulator modelling the 1D flux power spectrum as a function of the amplitude and slope of the small-scale linear matter power spectrum, and the state of the intergalactic medium at the epoch of interest (2 < z < 4). This parameterisation enables the prediction of the flux power spectrum in extended cosmological models that are not explicitly included in the training set, eliminating the need to construct bespoke emulators for a number of extensions to ΛCDM. Our emulator is appropriate for cosmologies in which the linear matter power spectrum is described to percent level accuracy by just an amplitude and slope across the epoch of interest, and in the regime probed by eBOSS/DESI data. We demonstrate this for massive neutrino cosmologies, where the emulator is able to predict the flux power spectrum in a Σmν = 0.3 eV neutrino cosmology to sub-percent accuracy, without including massive neutrinos in the training simulations. Further parameters would be required to describe models with sharp features in the linear power, such as warm or light axion dark matter. This work willmore »
- Authors:
-
- Univ. College London (United Kingdom)
- Univ. College London (United Kingdom); Barcelona Institute of Science and Technology (BIST), Barcelona (Spain)
- Stockholm Univ. (Sweden); Univ. of Toronto, ON (Canada)
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- Univ. College London (United Kingdom); Stockholm Univ. (Sweden)
- Brookhaven National Lab. (BNL), Upton, NY (United States)
- Publication Date:
- Research Org.:
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), High Energy Physics (HEP); Science and Technology Facilities Council (STFC) (United Kingdom); Swedish Research Council (SRC)
- OSTI Identifier:
- 1814432
- Grant/Contract Number:
- AC02-05CH11231; ST/P002307/1; ST/R002452/1; ST/R00689X/1; ST/N003853/1; ST/R000476/1; RYC- 2018-025210; DNR 2017-04212
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Journal of Cosmology and Astroparticle Physics
- Additional Journal Information:
- Journal Volume: 2021; Journal Issue: 05; Journal ID: ISSN 1475-7516
- Publisher:
- Institute of Physics (IOP)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 79 ASTRONOMY AND ASTROPHYSICS; cosmological parameters from LSS; cosmological simulations; Lyman alpha forest; neutrino masses from cosmology
Citation Formats
Pedersen, Christian, Font-Ribera, Andreu, Rogers, Keir K., McDonald, Patrick, Peiris, Hiranya V., Pontzen, Andrew, and Slosar, Anže. An emulator for the Lyman-α forest in beyond-ΛCDM cosmologies. United States: N. p., 2021.
Web. doi:10.1088/1475-7516/2021/05/033.
Pedersen, Christian, Font-Ribera, Andreu, Rogers, Keir K., McDonald, Patrick, Peiris, Hiranya V., Pontzen, Andrew, & Slosar, Anže. An emulator for the Lyman-α forest in beyond-ΛCDM cosmologies. United States. https://doi.org/10.1088/1475-7516/2021/05/033
Pedersen, Christian, Font-Ribera, Andreu, Rogers, Keir K., McDonald, Patrick, Peiris, Hiranya V., Pontzen, Andrew, and Slosar, Anže. Thu .
"An emulator for the Lyman-α forest in beyond-ΛCDM cosmologies". United States. https://doi.org/10.1088/1475-7516/2021/05/033. https://www.osti.gov/servlets/purl/1814432.
@article{osti_1814432,
title = {An emulator for the Lyman-α forest in beyond-ΛCDM cosmologies},
author = {Pedersen, Christian and Font-Ribera, Andreu and Rogers, Keir K. and McDonald, Patrick and Peiris, Hiranya V. and Pontzen, Andrew and Slosar, Anže},
abstractNote = {Interpreting observations of the Lyman-α forest flux power spectrum requires interpolation between a small number of expensive simulations. We present a Gaussian process emulator modelling the 1D flux power spectrum as a function of the amplitude and slope of the small-scale linear matter power spectrum, and the state of the intergalactic medium at the epoch of interest (2 < z < 4). This parameterisation enables the prediction of the flux power spectrum in extended cosmological models that are not explicitly included in the training set, eliminating the need to construct bespoke emulators for a number of extensions to ΛCDM. Our emulator is appropriate for cosmologies in which the linear matter power spectrum is described to percent level accuracy by just an amplitude and slope across the epoch of interest, and in the regime probed by eBOSS/DESI data. We demonstrate this for massive neutrino cosmologies, where the emulator is able to predict the flux power spectrum in a Σmν = 0.3 eV neutrino cosmology to sub-percent accuracy, without including massive neutrinos in the training simulations. Further parameters would be required to describe models with sharp features in the linear power, such as warm or light axion dark matter. This work will facilitate the combination of upcoming DESI data with observations of the cosmic microwave background, to obtain constraints on neutrino mass and other extensions to ΛCDM cosmology.},
doi = {10.1088/1475-7516/2021/05/033},
journal = {Journal of Cosmology and Astroparticle Physics},
number = 05,
volume = 2021,
place = {United States},
year = {Thu May 13 00:00:00 EDT 2021},
month = {Thu May 13 00:00:00 EDT 2021}
}
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