Covariance and gauge invariance in relativistic theories of gravity
arXiv:1403.7515 · doi:10.1142/S0217732314500758
Abstract
Any metric theory of gravity whose interaction with quantum particles is described by a covariant wave equation is equivalent to a vector theory that satisfies Maxwell-type equations identically. This result does not depend on any particular set of field equations for the metric tensor, but only on covariance. It is derived in the linear case, but can be extended to any order of approximation in the metric deviation. In this formulation of the interaction of gravity with matter, angular momentum and momentum are conserved locally.
arXiv comment8 pages, to appear in Modern Physics Letters A
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