General Relativity Revisited: Generalized Nordstr\"om Theory

TL;DR

This paper revisits general relativity by proposing a generalized Nordström theory that introduces a scalar field related to the Ricci tensor, offering an alternative framework that aligns with experimental results and unifies gravitational and matter fields.

Contribution

It introduces a scalar potential related to the Ricci tensor, providing a linear superposition framework within a nonlinear gravitational theory, aligning with experimental data.

Findings

Scalar field provides a unified description of gravity and matter.

The theory's predictions match those of General Relativity.

Energy-momentum conservation is maintained in the scalar framework.

Abstract

In 1945 Einstein concluded that [1]: 'The present theory of relativity is based on a division of physical reality into a metric field (gravitation) on the one hand, and into an electromagnetic field and matter on the other hand. In reality space will probably be of a uniform character and the present theory be valid only as a limiting case. For large densities of field and of matter, the field equations and even the field variables which enter into them will have no real significance.'. The dichotomy can be resolved by introducing a scalar field/potential algebraically related to the Ricci tensor for which the corresponding metric is free of additional singularities. Hence, although a fundamentally nonlinear theory, the scalar field/potential provides an analytic framework for interacting particles; described by linear superposition. The stress tensor for the scalar field includes both the sources of and the energy-momentum for the gravitational field, and has zero covariant and ordinary divergence. Hence, the energy-momentum for the gravitational field and sources are conserved. The theory's predictions agree with the experimental results for General Relativity. By introducing the corresponding Lagrangian to analytic mechanics, what is experimentally known for GR can be accounted for.