Noether versus Killing symmetry of conformally flat Friedmann metric

Details Noether versus Killing symmetry of conformally flat Friedmann metric Noether versus Killing symmetry of conformally flat Friedmann metric

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007gregr..39.2053b&link_type=abstract

General Relativity and Gravitation, Volume 39, Issue 12, pp.2053-2059

Mathematics

Logic

3

Noether Symmetry, Killing Vector, Conformal Killing Vector

Scientific paper

In a recent study Noether symmetries of some static spacetime metrics in comparison with Killing vectors of corresponding spacetimes were studied. It was shown that Noether symmetries provide additional conservation laws that are not given by Killing vectors. In an attempt to understand how Noether symmetries compare with conformal Killing vectors, we find the Noether symmetries of the flat Friedmann cosmological model. We show that the conformally transformed flat Friedman model admits additional conservation laws not given by the Killing or conformal Killing vectors. Inter alia, these additional conserved quantities provide a mechanism to twice reduce the geodesic equations via the associated Noether symmetries.

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