I am using xAct to do some tensor computation. Consider the following term
which is latex is
$ $ D_a D^a \phi\, D_b D^b \phi $ $
where $ \phi$ is defined to be a field in xAct and $ D_a$ are derivatives.
Now, the command I wrote is a function like
I would like to substitute $ D_a D^a \phi \rightarrow D_a D^a \phi^3$ that is,
f[-x_][f[x_][g]] >>> f[-x_][f[x_][g g g]]
How can I do this with Mathematica? I tried with
/. CD[-a_][CD[a_][_]] -> CD[-a_][CD[a_][\[Phi] \[Phi] \[Phi]]]
but it does not work
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