[ET Trac] #963: Improve McLachlan accuracy

[Zach Etienne]

#963: Improve McLachlan accuracy

 Reporter: Erik Schnetter
   Status: open
Milestone: 
  Version: 
     Type: enhancement
 Priority: minor
Component: EinsteinToolkit thorn

Comment (by Zach Etienne):

The “Duez et al” trick is quite powerful – I implemented this trick in Baikal a few months ago and found H constraint violations drop by about an order of magnitude compared to when it’s not enabled, for binary black hole simulations \(e.g., a ET BBH gallery example - like simulation\).

The trick dates back to Yoneda & Shinkai [https://arxiv.org/abs/gr-qc/0204002](https://arxiv.org/abs/gr-qc/0204002) , who did an analytical \(non-numerical\) investigation

… and Duez et al I think were the first to report its use in NR simulations: [https://arxiv.org/abs/gr-qc/0209102](https://arxiv.org/abs/gr-qc/0209102)

In addition Raithel & Paschalidis recently found that this trick improves H constraint convergence behavior in the context of binary neutron star simulations: [https://arxiv.org/abs/2204.00698](https://arxiv.org/abs/2204.00698)

Future versions of Baikal/BaikalVacuum will have this trick enabled by default – I’m now calibrating the magnitude and scaling of the coefficient.

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Ticket URL: https://bitbucket.org/einsteintoolkit/tickets/issues/963/improve-mclachlan-accuracy
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