Hello, I am reading the paper "Covariant Action for a D=11 Five-Brane with the Chiral Field".(adsbygoogle = window.adsbygoogle || []).push({});

I don't understand the [itex](\partial a)^2[/itex] in the dual field strength [itex]\widetilde{F}_{mn}\equiv\frac{1}{\sqrt {(\partial a)^2}}F^*_{mnl}\partial^la(x)[/itex].

Is it ##\partial_ra\partial^ra##?

Regards.

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# A question about notation

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