GW150914 example should be updated to work with the Einstein Toolkit thornlist

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Issue #2029 closed
Ian Hinder created an issue

The GW150914 example currently uses its own thornlist, because Llama was not part of the ET when it was created. Llama has now been added to the ET. The GW150914 thornlist uses WaveExtractCPM and ADMConstraints. These can probably be removed, for the sake of having a parameter file which works with the ET thornlist. ADMConstraints can be replaced with ML_ADMConstraints. WaveExtractCPM is an "in-development" code which has not been extensively tested. It gives the GW strain directly from Schwarzschild perturbation theory, without needing to go via fixed-frequency integration of Psi4, so is good for quick plots. However, it seems to give worse results than Psi4 for the ringdown, and possibly has bugs in some of the l > 2 modes, so I don't think it is ready for inclusion in the toolkit just yet.

Keyword: gallery

Comments (7)

  1. Roland Haas
    • removed comment

    WaveExtractCPM does terrible things to parameter values, namely it assigns values to parameters in Fortran code which (only in Fortran) changes the values of the Parameters circumventing CCTK_ParameterSet. Not advertising its existence is a good thing to do :-).

  2. Ian Hinder reporter
    • removed comment

    That is... disconcerting. Do WaveExtractL and WaveExtract also do this?

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