Observational constraints in Delta Gravity: CMB and supernovas
  Delta Gravity is a gravitational model based on an extension of General
Relativity given by a new symmetry called $\tilde{\delta}$. In this model, new
matter fields are added to the original matter fields, motivated by the
additional symmetry. We call them $\tilde{\delta}$ matter fields. This model
predicts an accelerating Universe without the need to introduce a cosmological
constant. In this work, we study the Delta Gravity prediction about the scalar
CMB TT power spectrum using an analytical hydrodynamical approach. To fit the
Planck satellite's data with the DG model, we used a Markov Chain Monte Carlo
analysis. We also include a study about the compatibility between SNe-Ia and
CMB observations in the Delta Gravity Context. Finally, we obtain the scalar
CMB TT power spectrum and the fitted parameters needed to explain both SNe-Ia
Data and CMB measurements. The results are in a reasonable agreement with both
observations considering the analytical approximation. We also discuss if the
Hubble Constant and the Accelerating Universe are in concordance with the
observational evidence in the Delta Gravity context.
