Hello,
I am having an issue when it comes to expanding out the Einstein tensor to Christoffels, and then applying ToCanonical.
When I attempt to expand:
EinsteinCD[a,b] //EinsteinToRicci //RiemannToChristoffel //ChristoffelToGradMetric //ToCanonical
I get thrown an error SymmetryOf:: nouse
I've traced the error down to applying the RiemannToChristoffel on the RicciScalarCD[] term. This generates an expression encompassed in red parentheses. When contracted with the metric, a double counting of indices appears (See the attached screenshot).
I get the same error when I attempt to run the identical line of code from the xTensorDoc.nb file.
I'm thinking it may have something to do with my system, but I'm not 100% sure as I'm still new with xAct. I'm using a Mac version 10.11.6. Any clues as to what may be causing this?
Thanks,
Alex