[ET Trac] [Einstein Toolkit] #1630: ML_BSSN harmonic shift is ill-posed

[Einstein Toolkit]

#1630: ML_BSSN harmonic shift is ill-posed
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 Reporter:  eschnett               |       Owner:                     
     Type:  defect                 |      Status:  new                
 Priority:  major                  |   Milestone:                     
Component:  EinsteinToolkit thorn  |     Version:  development version
 Keywords:                         |  
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 The implementation of the ML_BSSN harmonic shift is ill-posed. It should
 use the evolved Gamma variables instead of taking metric derivatives. A
 robust stability test clearly shows an instability: higher resolutions
 have faster growing errors.

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Ticket URL: <https://trac.einsteintoolkit.org/ticket/1630>
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