How to get boundary terms for variation of Lagrangian?

[Anzo]

Hi all,

I would like to keep track of the boundary terms when calculate the variational derivative of a Lagrangian. I read that VarD automatically drop the terms that are total derivatives.

In particular, I would like to replicate the example file https://github.com/xAct-contrib/examples/blob/master/Lagrangian-variation-xPert-VarD.nb but keeping track of the Boundary terms.

I found that this subject has already been discussed in this group, https://groups.google.com/forum/#!searchin/xAct/boundary|sort:date/xact/QwrjqZzcA9k/9C2ED2DRiIwJ

and I could see the work around that Leo Stein proposed, however I was wondering if in the meantime that workaround has been integrated into xAct and there is a more direct/easier way

to evaluate it.

Cheers

A

[Jose]

Hi Anzo,

We haven't implemented yet the ideas proposed by Leo in that email. If you advance in this direction, please let us know.

Cheers,

Jose.