Re: Notation Nabla^a in section 19.5

yunjiangster wrote:

In the expression of the energy-momentum tensor conservation equation, we see Nabla^a. I am wondering if the superscript here means anything different from the subscript version Nabla_a, since I couldn't find a reasonable way to interpret the superscript version as an index-raised version of the subscript version via the metric g_ab.

The index-raised version is exactly what it is, and you don't have to interpret anything. Just calculate it.

Laura