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The recent data release by the Planck satellite collaboration presents arenewed challenge for modified theories of gravitation. Such theories must becapable of reproducing the observed angular power spectrum of the cosmicmicrowave background radiation. For modified theories of gravity, an addedchallenge lies with the fact that standard computational tools do not readilyaccommodate the features of a theory with a variable gravitational couplingcoefficient. An alternative is to use less accurate but more easily modifiablesemianalytical approximations to reproduce at least the qualitative features ofthe angular power spectrum. We extend a calculation that was used previously todemonstrate compatibility between the Scalar-Tensor-Vector-Gravity (STVG)theory, also known by the acronym MOG, and data from the Wilkinson MicrowaveAnisotropy Probe (WMAP) to show consistency between the theory and the newlyreleased Planck 2018 data. We find that within the limits of thisapproximation, the theory accurately reproduces the features of the angularpower spectrum.

Scalar-Tensor-Vector modified gravity in light of the Planck 2018 data