Cosmological model with dynamical curvature

Understand

The recently introduced relativistic Lagrangian darkon fluid model (EPJ C (2015) 75:9) is generalized to a self-gravitating, irrotational, pressure-less and stress free geodesic fluid, whose energy-momentum tensor is dust-like with nontrivial energy flow, defining the general framework for our cosmological model.

• In the present paper we consider only the averaged dynamics of the Universe at very large scales, allowing us to work with conformal flat geometry.
• The corresponding covariant propagation and constraint equations are treated in a shear-free nonrelativistic limit.
• The dynamics is described with a Lagrangian in minisuperspace.