Consistent Gravitationally-Coupled Spin-2 Field Theory

Understand

Inspired by the translational gauge structure of teleparallel gravity, the theory for a fundamental massless spin-2 field is constructed.

• Accordingly, instead of being represented by a symmetric second-rank tensor, the fundamental spin-2 field is assumed to be represented by a spacetime (world) vector field assuming values in the Lie algebra of the translation group.
• The flat-space theory naturally emerges in the Fierz formalism and is found to be equivalent to the usual metric-based theory.
• However, the gravitationally coupled theory, with gravitation itself described by teleparallel gravity, is shown not to present the consistency problems of the spin-2 theory constructed on the basis of general relativity.