New MGCAMB tests of gravity with CosmoMC and Cobaya

Abstract

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 $\mu$, $\Sigma$ and the dark energy density fraction ${\Omega }_X$ as functions of redshift, the option to work with a direct implementation of $\mu$, $\Sigma$ (instead of converting to $\mu$, $\gamma$ 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 $w\ne -1$ 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.

8 pages + 2 appendices, 4 figures, matches the version accepted to JCAP; MGCAMB, MGCosmoMC and MGCobaya available at https://github.com/sfu-cosmo/MGCAMB, https://github.com/sfu-cosmo/MGCosmoMC, https://github.com/sfu-cosmo/MGCobaya

References in corpus (28)

• The Clustering of the SDSS DR7 Main Galaxy Sample I: A 4 per cent Distance Measure at z=0.15
• Models of f(R) Cosmic Acceleration that Evade Solar-System Tests
• Beyond the Cosmological Standard Model
• Healthy theories beyond Horndeski
• Cobaya: Code for Bayesian Analysis of hierarchical physical models
• Exploring gravitational theories beyond Horndeski
• Maximal freedom at minimum cost: linear large-scale structure in general modifications of gravity
• Approaches to Understanding Cosmic Acceleration
• The Completed SDSS-IV extended Baryon Oscillation Spectroscopic Survey: Baryon acoustic oscillations with Lyman-$\alpha$ forests
• The Completed SDSS-IV extended Baryon Oscillation Spectroscopic Survey: BAO and RSD measurements from anisotropic clustering analysis of the Quasar Sample in configuration space between redshift 0.8 and 2.2
• The Completed SDSS-IV extended Baryon Oscillation Spectroscopic Survey: measurement of the BAO and growth rate of structure of the luminous red galaxy sample from the anisotropic correlation function between redshifts 0.6 and 1
• Distinguishing Modified Gravity from Dark Energy
• The Completed SDSS-IV extended Baryon Oscillation Spectroscopic Survey: BAO and RSD measurements from the anisotropic power spectrum of the Quasar sample between redshift 0.8 and 2.2
• Searching for modified growth patterns with tomographic surveys
• Crossing the Phantom Divide with Parameterized Post-Friedmann Dark Energy
• Testing gravity with CAMB and CosmoMC
• A unifying description of dark energy
• Current constraints on the cosmic growth history
• The Completed SDSS-IV extended Baryon Oscillation Spectroscopic Survey: measurement of the BAO and growth rate of structure of the emission line galaxy sample from the anisotropic power spectrum between redshift 0.6 and 1.1
• Effective Field Theory of Cosmic Acceleration: constraining dark energy with CMB data
• MGCAMB with massive neutrinos and dynamical dark energy
• The clustering of the SDSS-IV extended Baryon Oscillation Spectroscopic Survey DR16 luminous red galaxy and emission line galaxy samples: cosmic distance and structure growth measurements using multiple tracers in configuration space
• The Completed SDSS-IV extended Baryon Oscillation Spectroscopic Survey: a multi-tracer analysis in Fourier space for measuring the cosmic structure growth and expansion rate
• Principal reconstructed modes of dark energy and gravity
• Cosmological Constraints on sub-horizon scales modified gravity theories with MGCLASS II
• Modified Einstein versus Modified Euler for Dark Matter
• Singling out modified gravity parameters and datasets reveals a dichotomy between Planck and lensing
• On validity of the quasi-static approximation in scalar-tensor theories

Cited by in corpus (19)

• Planck-PR4 anisotropy spectra show (better) consistency with General Relativity
• The SRG-eROSITA All-Sky Survey : Constraints on f(R) Gravity from Cluster Abundance
• Exploring the Growth Index ${\gamma }_L$: Insights from Different CMB Dataset Combinations and Approaches
• Constraining f(R) gravity with cross-correlation of galaxies and cosmic microwave background lensing
• Cosmological study of a symmetric teleparallel gravity model
• Disentangling modified gravity from a dark force with gravitational redshift
• Exploring Modified Gravity: Constraints on the $\mu$ and $\Sigma$ Parametrization with WMAP, ACT, and SPT
• Lower tensor-to-scalar ratio as possible signature of modified gravity
• Enhancing Cosmological Model Selection with Interpretable Machine Learning
• Comparing the motion of dark matter and standard model particles on cosmological scales
• Interpretable and physics-informed emulator for the linear matter power spectrum from machine learning
• Forecasting the Constraint on the Hu-Sawicki $f(R)$ Modified Gravity in the CSST $3\times 2$pt Photometric Survey
• Breaking the cosmological invariance of the dark matter halos shape as a new probe of modified gravity
• Constraints on the normal branch of DGP gravity from SPT galaxy clusters with DES and HST weak-lensing mass calibration and from Planck PR4 CMB anisotropies
• Illuminating the Dark Sector: Understanding Modified Gravity Signatures with Cross-Correlations of Gravitational Waves and Large-Scale Structure
• Ray-traced weak lensing convergence in screened modified gravity theories
• Addressing Dipole Tension via Clustering in $\Lambda$CDM and beyond
• Cosmological constraints on viable $f(R)$ models using weak lensing
• Probing gravity with non-linear clustering in redshift space