<div dir="ltr"><div>Thanks for the quick responses Erik and Miguel</div><div><br></div><div>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.</div><div><br></div><div>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. <br></div><div><br></div><div>Nicholas Olsen<br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Mon, Feb 7, 2022 at 1:51 PM Miguel Zilhão <<a href="mailto:mzilhao@ua.pt">mzilhao@ua.pt</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">hi Nick,<br>
<br>
i can't really help you out with Kranc, but we have a freely available thorn that does precisely the <br>
Einstein-Klein-Gordon system. you can find it here as part of the Canuda library: <br>
<a href="https://bitbucket.org/canuda/scalar/src/master/" rel="noreferrer" target="_blank">https://bitbucket.org/canuda/scalar/src/master/</a><br>
i hope it helps.<br>
<br>
cheers,<br>
Miguel<br>
<br>
On 07/02/2022 17:50, Nick Olsen wrote:<br>
> Hello everyone<br>
> <br>
> I have been trying to write a thorn to couple the Klein-Gordon equations to the 3+1 Einstein <br>
> equations. I can't figure out the details on how to make the thorn tell the ET how to update T_munu <br>
> according to the evolution equations. I've been trying to write the thorn with Kranc without much <br>
> luck, as Kranc isn't telling me anything when it does fail. I have attached the .m of the attempted <br>
> thorn here. If anyone has any input or suggestions it would be greatly appreciated.<br>
> <br>
> Nicholas Olsen<br>
> <br>
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</blockquote></div>