#2930: Bug in QuasiLocalMeasures
Reporter: Marco Brito Status: new Milestone: Version: Type: bug Priority: major Component: EinsteinToolkit thorn
I found a bug in the QuasiLocalMeasures thorn, in the computation of the ADM momentum. In the source code file qlm_analyse.F90, in line 361 there is a plus sign instead of a minus sign, contradicting the ADM momentum formula: P^i_{ADM} = \frac{1}{8\pi}\lim_{r\to\infty} \oint_S (K^i_j - \delta^i_j K)dS^j [1]
As expected for slices where K \neq 0 one was getting a wrong result. The correction is easy, just replace the plus sign by a minus sign. You can find the corrected file in attachment.
[1] M. Alcubierre, Introduction to 3+1 Numerical Relativity, International Series of Monographs on Physics (Oxford University Press, Oxford, 2008). attachment: qlm_analyse.F90 (https://api.bitbucket.org/2.0/repositories/einsteintoolkit/tickets/issues/29...)
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