Observational indications of an apparent cosmic acceleration from the SNIa data

This work looks into the implications of bulk peculiar motions for the interpretation of the recent accelerated expansion. We employ a tilted cosmological model with two families of observers/frames. The first follows the Hubble flow and the second is the frame of real observers, moving relative to the universal expansion with non-relativistic peculiar velocities. Using the Pantheon compilation of Type Ia supernovae, we show that the tilted model can reproduce the late-time cosmic acceleration without the need of a Cosmological Constant, without modifying General Relativity and without abandoning the Friedmann models. We also discuss the predictions of the tilted scenario. Among them is the presence of an apparent dipolar anisotropy in the sky distribution of the deceleration parameter, with a redshift-decaying magnitude.