${\}texttt\{{Hi}-{COLA}\}$: Fast, approximate simulations of structure formation in Horndeski gravity. Wright, B. S., Gupta, A. S., Baker, T., & Valogiannis, G. September, 2022. arXiv:2209.01666 [astro-ph]![${\}texttt\{{Hi}-{COLA}\}$: Fast, approximate simulations of structure formation in Horndeski gravity [link]](https://bibbase.org/img/filetypes/link.svg "link")
Paper doi abstract bibtex We introduce ${\}texttt\{Hi-COLA\}$, a code designed to run fast, approximate ${\}textit\{N\}$-body simulations of non-linear structure formation in reduced Horndeski gravity. Given an input Lagrangian, ${\}texttt\{Hi-COLA\}$ dynamically constructs the appropriate field equations and consistently solves for the cosmological background, linear growth, and screened fifth force of that theory. Hence ${\}texttt\{Hi-COLA\}$ is a general, adaptable, and useful tool that allows the mildly non-linear regime of many Horndeski theories to be investigated for the first time, at low computational cost. In this work, we first describe the screening approximations and simulation setup of ${\}texttt\{Hi-COLA\}$ for theories with Vainshtein screening. We validate the code against traditional ${\}textit\{N\}$-body simulations for cubic Galileon gravity, finding $2.5{\}%$ agreement up to $k_\{{\}rm max\}=1.2{~}h/\{{\}rm Mpc\}$. To demonstrate the flexibility of ${\}texttt\{Hi-COLA\}$, we additionally run the first simulations of an extended shift-symmetric gravity theory. We use the consistency and modularity of ${\}texttt\{Hi-COLA\}$ to dissect how the modified background, linear growth, and screened fifth force all contribute to departures from ${\}Lambda$CDM in the non-linear matter power spectrum.
@misc{wright_texttthi-cola_2022,
title = {\${\textbackslash}texttt\{{Hi}-{COLA}\}\$: {Fast}, approximate simulations of structure formation in {Horndeski} gravity},
shorttitle = {\${\textbackslash}texttt\{{Hi}-{COLA}\}\$},
url = {http://arxiv.org/abs/2209.01666},
doi = {10.48550/arXiv.2209.01666},
abstract = {We introduce \${\textbackslash}texttt\{Hi-COLA\}\$, a code designed to run fast, approximate \${\textbackslash}textit\{N\}\$-body simulations of non-linear structure formation in reduced Horndeski gravity. Given an input Lagrangian, \${\textbackslash}texttt\{Hi-COLA\}\$ dynamically constructs the appropriate field equations and consistently solves for the cosmological background, linear growth, and screened fifth force of that theory. Hence \${\textbackslash}texttt\{Hi-COLA\}\$ is a general, adaptable, and useful tool that allows the mildly non-linear regime of many Horndeski theories to be investigated for the first time, at low computational cost. In this work, we first describe the screening approximations and simulation setup of \${\textbackslash}texttt\{Hi-COLA\}\$ for theories with Vainshtein screening. We validate the code against traditional \${\textbackslash}textit\{N\}\$-body simulations for cubic Galileon gravity, finding \$2.5{\textbackslash}\%\$ agreement up to \$k\_\{{\textbackslash}rm max\}=1.2{\textasciitilde}h/\{{\textbackslash}rm Mpc\}\$. To demonstrate the flexibility of \${\textbackslash}texttt\{Hi-COLA\}\$, we additionally run the first simulations of an extended shift-symmetric gravity theory. We use the consistency and modularity of \${\textbackslash}texttt\{Hi-COLA\}\$ to dissect how the modified background, linear growth, and screened fifth force all contribute to departures from \${\textbackslash}Lambda\$CDM in the non-linear matter power spectrum.},
urldate = {2022-09-13},
publisher = {arXiv},
author = {Wright, Bill S. and Gupta, Ashim Sen and Baker, Tessa and Valogiannis, Georgios},
month = sep,
year = {2022},
note = {arXiv:2209.01666 [astro-ph]},
keywords = {astrophysics, mentions sympy},
}
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Hence ${\\}texttt\\{Hi-COLA\\}$ is a general, adaptable, and useful tool that allows the mildly non-linear regime of many Horndeski theories to be investigated for the first time, at low computational cost. In this work, we first describe the screening approximations and simulation setup of ${\\}texttt\\{Hi-COLA\\}$ for theories with Vainshtein screening. We validate the code against traditional ${\\}textit\\{N\\}$-body simulations for cubic Galileon gravity, finding $2.5{\\}%$ agreement up to $k_\\{{\\}rm max\\}=1.2{~}h/\\{{\\}rm Mpc\\}$. To demonstrate the flexibility of ${\\}texttt\\{Hi-COLA\\}$, we additionally run the first simulations of an extended shift-symmetric gravity theory. 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Given an input Lagrangian, \\${\\textbackslash}texttt\\{Hi-COLA\\}\\$ dynamically constructs the appropriate field equations and consistently solves for the cosmological background, linear growth, and screened fifth force of that theory. Hence \\${\\textbackslash}texttt\\{Hi-COLA\\}\\$ is a general, adaptable, and useful tool that allows the mildly non-linear regime of many Horndeski theories to be investigated for the first time, at low computational cost. In this work, we first describe the screening approximations and simulation setup of \\${\\textbackslash}texttt\\{Hi-COLA\\}\\$ for theories with Vainshtein screening. We validate the code against traditional \\${\\textbackslash}textit\\{N\\}\\$-body simulations for cubic Galileon gravity, finding \\$2.5{\\textbackslash}\\%\\$ agreement up to \\$k\\_\\{{\\textbackslash}rm max\\}=1.2{\\textasciitilde}h/\\{{\\textbackslash}rm Mpc\\}\\$. 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