$\mathcal{H}$-EFTCAMB: A Cobaya-Integrated, Python-Wrapped Extension of EFTCAMB for Covariant Horndeski Gravity
Abstract
We present $\mathcal{H}\mathtt{-EFTCAMB}$, the official successor to $\mathtt{EFTCAMB}$. The original $\mathtt{EFTCAMB}$ is designed as a consistent and numerically stable implementation of the effective field theory (EFT) of dark energy in the Einstein-Boltzmann code $\mathtt{CAMB}$. On top of this, $\mathcal{H}\mathtt{-EFTCAMB}$ introduces a new Horndeski module that supports computing cosmology for an arbitrary input covariant Horndeski Lagragian. $\mathcal{H}\mathtt{-EFTCAMB}$ supports both mapping the Horndeski theory to an EFT lagrangian to solve in the EFT framework as well as directly solving for the scalar field equations of motion derived from the covariant Lagrangian. The latter approach also works for the cases when the Horndeski field experiences turn-overs, e.g. oscillation, where the EFT approach breaks down. The Horndeski module has been validated by comparing internally with existing models in the original $\mathtt{EFTCAMB}$ and externally with $\mathtt{hi\_class}$. $\mathcal{H}\mathtt{-EFTCAMB}$ features a flexible Python wrapper that is seamlessly integrated into the widely utilized cosmological sampler $\mathtt{Cobaya}$. \heft~is publicly available and serves as a comprehensive tool for testing gravity against the precision data from current and next-generation surveys.
Authors 9
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Affiliation as printed
Institute for Frontier in Astronomy and Astrophysics , Beijing Normal University , Beijing 102206 , China
School of Physics and Astronomy , Beijing Normal University , Beijing 100875 , China
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Affiliation as printed
Department of Physics and Leinweber Institute for Theoretical Physics , University of Michigan , 450 Church St , Ann Arbor , MI 48109
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Affiliation as printed
Institute Lorentz , Leiden University , PO Box 9506 , Leiden 2300 RA , The Netherlands
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Affiliation as printed
Institute Lorentz , Leiden University , PO Box 9506 , Leiden 2300 RA , The Netherlands
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Istituto Nazionale di Fisica Nucleare, Sezione di Genova
Affiliation as printed
Department of Physics and INFN , University of Genova , Via Dodecaneso 33 , 16146 , Italy
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Affiliation as printed
Institute for Frontier in Astronomy and Astrophysics , Beijing Normal University , Beijing 102206 , China
School of Physics and Astronomy , Beijing Normal University , Beijing 100875 , China
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Istituto Nazionale di Fisica Nucleare, Sezione di Napoli · University of Naples Federico II
Affiliation as printed
Dipartimento di Fisica "E. Pancini" , Università degli Studi di Napoli "Federico II" , Compl. Univ. di Monte S. Angelo , Edificio G , Via Cinthia , I-80126 , Napoli , Italy
INFN Sezione di Napoli , Università degli Studi di Napoli "Federico II" , Compl. Univ. di Monte S. Angelo , Edificio G , Via Cinthia , I-80126 , Napoli , Italy
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Affiliation as printed
Institute Lorentz , Leiden University , PO Box 9506 , Leiden 2300 RA , The Netherlands
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