A dynamically constrained Yang-Mills theory with Lorentz symmetry group as an alternative theory of gravity

Abstract

We develop the complete composite theory of gravity, in which the gauge vector fields of the Yang-Mills theory with Lorentz symmetry group are expressed in terms of the tetrad variables obtained from the decomposition of a metric. A key element of a compelling formulation of composite gravity are refined coordinate conditions that offer a natural coupling of the gravitational field to matter and ensure the closest relationship to general relativity. The composite theory of gravity is presented from three different perspectives highlighting its intuitive interpretation, its relationship to general relativity and its canonical Hamiltonian formulation, where the latter clarifies the structure of the heavily constrained theory and provides the starting point for its quantization. The main physical ingredient of the theory is an anisotropic velocity-momentum relation, or tensorial mass, described by a metric. We discuss the static isotropic solution in great detail because it provides the background for the high-precision tests to be passed by an alternative theory of gravity and for the understanding of black holes.