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Publication in Physical Review Letters

The letter "Geometric Invariant Measuring the Deviation from Kerr Data" by Thomas Baeckdahl and Juan A Valiente Kroon has been published in Physical Review Letters. It provides a method to decide how dynamical a given black hole is. It is expected that these ideas will be of relevance in numerical Relativity and in the problem of the non-linear stability of black holes. For more details see link: 

http://prl.aps.org/abstract/PRL/v104/i23/e231102