The general Friedmann equation: a mathematical point of view

Details The general Friedmann equation: a mathematical point of view The general Friedmann equation: a mathematical point of view

2011-10-05

arxiv.org/abs/1110.0912v1

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

11 pages

Scientific paper

The note presents a classification of the relevant distinct types of solutions of the general Friedmann equation without assuming a priori restrictions for the parameters occurring in this equation. The emphasis is on the case of a non-vanishing cosmological constant. The classification uses algebraic criteria. The result is: There are four distinct basic types of models. Explicit formulas for decisive terms are given. Characteristic mutual relations of cosmological constant, mass and radiation density to distinguish between the models are calculated.

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