Rastall's Cosmology and its Observational Constraints

Understand

The Rastall's theory is a modification of General Relativity touching one of the cornestone of gravity theory: the conservation laws.

• In Rastall's theory, the energy-momentum tensor is not conserved anymore, depending now on the gradient of the Ricci curvature.
• In this sense, this theory can be seen as a classical implementation of quantum effects in a curved background space-time.
• We exploit this structure in order to reproduce some results of an effective theory of quantum loop cosmology.