Singling out modified gravity parameters and datasets reveals a dichotomy between Planck and lensing

Understand

An important route to testing General Relativity (GR) at cosmological scales is usually done by constraining modified gravity (MG) parameters added to the Einstein perturbed equations.

• Most studies have analyzed so far constraints on pairs of MG parameters, but here, we explore constraints on one parameter at a time while fixing the other at its GR value.
• This allows us to analyze various models while benefiting from a stronger constraining power from the data.
• We also explore which specific datasets are in tension with GR.