Cosmological models with linearly varying deceleration parameter

Details Cosmological models with linearly varying deceleration parameter Cosmological models with linearly varying deceleration parameter

2011-02-04

arxiv.org/abs/1102.0915v3

International Journal of Theoretical Physics 51 (2012) 612-621

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

12 pages, 7 figures; some typo corrections; to appear in International Journal of Theoretical Physics

Scientific paper

10.1007/s10773-011-0941-5

We propose a new law for the deceleration parameter that varies linearly with time and covers Berman's law where it is constant. Our law not only allows one to generalize many exact solutions that were obtained assuming constant deceleration parameter, but also gives a better fit with data (from SNIa, BAO and CMB), particularly concerning the late time behavior of the universe. According to our law only the spatially closed and flat universes are allowed; in both cases the cosmological fluid we obtain exhibits quintom like behavior and the universe ends with a big-rip. This is a result consistent with recent cosmological observations.

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