Darboux class of cosmological fluids with time-dependent adiabatic indices

Details Darboux class of cosmological fluids with time-dependent adiabatic indices Darboux class of cosmological fluids with time-dependent adiabatic indices

2000-03-30

arxiv.org/abs/gr-qc/0003108v6

1) Mod. Phys. Lett. A 15 (2000) 979-990; 2) MPLA 16 (2001) 1147-1150; 3) MPLA 16 (2001) 2029-2032

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

document with the following three latex files: 1) quhm.tex: 17 pages, 10 figs, 16 numbered refs, Honorable Mention GRF 2000, 2

Scientific paper

A one-parameter family of time dependent adiabatic indices is introduced for any given type of cosmological fluid of constant adiabatic index by a mathematical method belonging to the class of Darboux transformations. The procedure works for zero cosmological constant at the price of introducing a new constant parameter related to the time dependence of the adiabatic index. These fluids can be the real cosmological fluids that are encountered at cosmological scales and they could be used as a simple and efficient explanation for the recent experimental findings regarding the present day accelerating universe. In addition, new types of cosmological scale factors, corresponding to these fluids, are presented

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