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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