New MGCAMB tests of gravity with CosmoMC and Cobaya

We present a new version of MGCAMB, a patch for the Einstein-Boltzmann solver CAMB for cosmological tests of gravity. New features include a new cubic-spline parameterization allowing for a simultaneous reconstruction of μ , Σ and the dark energy density fraction Ω X as functions of redshift, the op...

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Bibliographic Details
Published in:Journal of cosmology and astroparticle physics 2023-08, Vol.2023 (8), p.38
Main Authors: Wang, Zhuangfei, Mirpoorian, Seyed Hamidreza, Pogosian, Levon, Silvestri, Alessandra, Zhao, Gong-Bo
Format: Article
Language:English
Subjects:
Cosmological perturbation theory in GR and beyond
Dark energy
dark energy theory
Dark matter
modified gravity
Parameterization
Perturbation
Red shift
Scalars
Statistical sampling techniques
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Summary:We present a new version of MGCAMB, a patch for the Einstein-Boltzmann solver CAMB for cosmological tests of gravity. New features include a new cubic-spline parameterization allowing for a simultaneous reconstruction of μ , Σ and the dark energy density fraction Ω X as functions of redshift, the option to work with a direct implementation of μ , Σ (instead of converting to μ , γ first), along with the option to test models with a scalar field coupled only to dark matter, and the option to include dark energy perturbations when working with w ≠ -1 backgrounds, to restore consistency with CAMB in the GR limit. This version of MGCAMB comes with a Python wrapper to run it directly from the Python interface, an implementation in the latest version of CosmoMC, and can be used with Cobaya.
ISSN:1475-7516
1475-7516
DOI:10.1088/1475-7516/2023/08/038