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## Main Question or Discussion Point

Does anyone know how to derive the wave equation in curved spacetime?

[tex](-g)^{-1\over 2}\partial_\mu((-g)^{1\over 2}g^{\mu \nu}\partial_\nu \phi) = 0 [/tex]

A reference, or an outline of the derivation would be very helpful. Thanks.

[tex](-g)^{-1\over 2}\partial_\mu((-g)^{1\over 2}g^{\mu \nu}\partial_\nu \phi) = 0 [/tex]

A reference, or an outline of the derivation would be very helpful. Thanks.

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