Curvature force and dark energy
Abstract
A curvature selfinteraction of the cosmic gas is shown to mimic a cosmological constant or other forms of dark energy, such as a rolling tachyon condensate or a Chaplygin gas. Any given Hubble rate and deceleration parameter can be traced back to the action of an effective curvature force on the gas particles. This force selfconsistently reacts back on the cosmological dynamics. The links between an imperfect fluid description, a kinetic description with effective antifriction forces and curvature forces, which represent a nonminimal coupling of gravity to matter, are established.
 Publication:

New Journal of Physics
 Pub Date:
 July 2003
 DOI:
 10.1088/13672630/5/1/385
 arXiv:
 arXiv:astroph/0302150
 Bibcode:
 2003NJPh....5...85B
 Keywords:

 Astrophysics;
 General Relativity and Quantum Cosmology;
 High Energy Physics  Phenomenology
 EPrint:
 14 pages