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By Er B. Balakin, Diego Pavón, Dominik J. Schwarz, Winfried Zimdahl and Fachbereich Physik Universität Konstanz


A curvature self-interaction 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 self-consistently 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 non-minimal coupling of gravity to matter, are established. PACS numbers: 98.80.Hw, 04.40.Nr, 95.30.Tg, 05.70.Ln

Year: 2003
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