Delta Gravity, Dark Energy and the accelerated expansion of the Universe

Jorge Alfaro (Pontificia Universidad Católica de Chile)

We study a model of the gravitational field based on two symmetric tensors. The equations of motion of test particles are derived: Massive particles do not follow a geodesic but massless particles trajectories are null geodesics of an effective metric. In Cosmology, we get accelerated expansion without a cosmological constant.