# derivative of a constant

17 May 2017the partial derivative \(\partial_\mu\phi\) of a constant field \(\phi\) is zero… but what about the covariant derivative \(\nabla_\mu\phi\)?

the partial derivative \(\partial_\mu\phi\) of a constant field \(\phi\) is zero… but what about the covariant derivative \(\nabla_\mu\phi\)?