Self-gravitating darkon fluid with anisotropic scaling
Abstract
The fluid model for the dark sector of the universe (darkon fluid) introduced previously in \cite{PRD} is reformulated as a modified model involving only variables from physical phase space. The Lagrangian of the model does not possess a free particle limit and hence the particles it describes, darkons, exist only as a self-gravitating fluid. This darkon fluid presents a dynamical realisation of the zero-mass Galilean algebra extended by anisotropic dilational symmetry with dynamical exponent . The model possesses cosmologically relevant solutions which are identical to those of \cite{PRD}. We derive also the equations for the cosmological perturbations at early times and determine their solutions. In addition, we discuss also some implications of adding higher spatial-derivative terms.
Cite
@article{arxiv.1008.1200,
title = {Self-gravitating darkon fluid with anisotropic scaling},
author = {P. C. Stichel and W. J. Zakrzewski},
journal= {arXiv preprint arXiv:1008.1200},
year = {2010}
}
Comments
a small error corrected; the paper accepted for publication in EPJC