[Users] Add a lapse condition

[Erik Rodrígo Jiménez Vázquez]

Thank you!

Of course, any help would be greatly appreciated. What I need to change in
the code of the LeanBSSNMoL thorn?

Erik


On Thu, Oct 24, 2019, 10:34 Miguel Zilhão <
miguel.zilhao.nogueira at tecnico.ulisboa.pt> wrote:

> hi Erik,
>
> you can also try with the LeanBSSNMoL thorn, which is not Kranc-generated.
> adding another gauge
> condition should be fairly simple; i can point you exactly to what you'd
> need to change in the code
> if you need.
>
> cheers,
> Miguel
>
> On 24/10/19 16:21, Peter Diener wrote:
> > Hi Erik,
> >
> > McLachlan is a thorn generated from a tool named Kranc from high level
> tensorial expressions in
> > Mathematica. So if you have
> > access to Mathematica you can add additional lapse conditions in the
> > mathematica source file located in:
> >
> > arrangements/McLachlan/m/McLachlan_BSSN.m
> >
> > and then regenerate the McLachlan thorn using
> >
> > make McLachlan_BSSN.out
> >
> > in the arrangements/McLachlan/m directory.
> >
> > I admit the section on gauge conditions is rather messy as the selection
> of particular gauges are
> > done based on conditionals on thorn parameters, but hopefully you can
> figure this out. Otherwise let
> > me know and I'll be happy to help.
> >
> > Cheers,
> >
> >    Peter
> >
> > On Thursday 2019-10-24 00:14, Erik Rodrígo Jiménez Vázquez wrote:
> >
> >> Date: Thu, 24 Oct 2019 00:14:05
> >> From: Erik Rodrígo Jiménez Vázquez <erjive at ciencias.unam.mx>
> >> To: users at einsteintoolkit.org
> >> Subject: [Users] Add a lapse condition
> >>
> >> Dear all
> >>
> >> Is there a way to add different gauge conditions for the lapse? I'm
> trying
> >> to add a gauge shock avoid lapse for the Bona-Masso family of slicing
> >> conditions
> >>
> >> dot alpha = -alpha^2 f(alpha) K
> >>
> >> with f(alpha)=1+constant/alpha^2
> >>
> >> I don't know if I should add a thorn that complements the McLachlan
> thorn,
> >> or what is the correct procedure to implement the gauge condition?
> >> Furthermore, this kind of gauge condition allows to the lapse become
> >> negative which I know is a serious drawback when the lapse collapses to
> >> zero, however I want to do some numerical experiments with this kind of
> >> lapse.
> >>
> >> Any help is very welcome. Thanks
> >> Erik
> >>
> >>
> >>
> >
> > _______________________________________________
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> > Users at einsteintoolkit.org
> > http://lists.einsteintoolkit.org/mailman/listinfo/users
> >
>
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