Astronomy and Astrophysics – Astrophysics – General Relativity and Quantum Cosmology
Scientific paper
2011-01-30
General Relativity and Gravitation Volume 42, Number 12, 2957-2980, 2010
Astronomy and Astrophysics
Astrophysics
General Relativity and Quantum Cosmology
19 pages
Scientific paper
10.1007/s10714-010-1054-9
The Lie symmetries of the geodesic equations in a Riemannian space are computed in terms of the special projective group and its degenerates (affine vectors, homothetic vector and Killing vectors) of the metric. The Noether symmetries of the same equations are given in terms of the homothetic and the Killing vectors of the metric. It is shown that the geodesic equations in a Riemannian space admit three linear first integrals and two quadratic first integrals. We apply the results in the case of Einstein spaces, the Schwarzschild spacetime and the Friedman Robertson Walker spacetime. In each case the Lie and the Noether symmetries are computed explicitly together with the corresponding linear and quadratic first integrals.
Paliathanasis Andronikos
Tsamparlis Michael
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