[Users] Thorn for coupled equations

[Nick Olsen]

Thanks for the quick responses Erik and Miguel

To answer Erik's question, I intended to use Kranc as a simpler way to
write the thorn and if the roadblocks didn't stop I was going to switch to
manually writing the thorn using one of the hydrodynamic thorns as a
skeleton framework to learn how to write a thorn for coupled equations,
which is roughly where I was today if Kranc wasn't an easy fix. I will have
to get back to you on your offer after I read through what Miguel has
linked here thoroughly, but thank you for the offer.

Miguel, I believe I will need some time to take an in depth look at this
before I can be sure that this is what I have been looking for, but I
suspect it is exactly what I need, so thank you very much for this.

Nicholas Olsen

On Mon, Feb 7, 2022 at 1:51 PM Miguel Zilhão <mzilhao at ua.pt> wrote:

> hi Nick,
>
> i can't really help you out with Kranc, but we have a freely available
> thorn that does precisely the
> Einstein-Klein-Gordon system. you can find it here as part of the Canuda
> library:
> https://bitbucket.org/canuda/scalar/src/master/
> i hope it helps.
>
> cheers,
> Miguel
>
> On 07/02/2022 17:50, Nick Olsen wrote:
> > Hello everyone
> >
> > I have been trying to write a thorn to couple the Klein-Gordon equations
> to the 3+1 Einstein
> > equations. I can't figure out the details on how to make the thorn tell
> the ET how to update T_munu
> > according to the evolution equations. I've been trying to write the
> thorn with Kranc without much
> > luck, as Kranc isn't telling me anything when it does fail. I have
> attached the .m of the attempted
> > thorn here. If anyone has any input or suggestions it would be greatly
> appreciated.
> >
> > Nicholas Olsen
> >
> > _______________________________________________
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> > Users at einsteintoolkit.org
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>
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