Reinterpreting dark energy through backreaction: the minimally coupled\n morphon field

In the context of averaged cosmologies, the effective equations can be\nwritten in the form of "regional" Friedmannian equations with additional\nsources arising from the so-called backreaction of inhomogeneities. We propose\na mean field description of this backreaction in terms of a regionally\nhomogeneous scalar field: this provides a physical motivation to the\nphenomenological scalar fields generically called quintessence fields. We\nexplicitly reconstruct the potential of the scalar field for a one-parameter\nfamily of scaling solutions to the backreaction problem, showing that it\nentails most of the standard scalar fields including e.g. standard and phantom\nquintessence scenarii.\n