Scale-invariant gauge theories of gravity: theoretical foundations

TL;DR

This paper develops a new class of scale-invariant gauge theories of gravity, extending existing frameworks by introducing an 'extended' transformation law that broadens the scope of local scale invariance in gravitational theories.

Contribution

It introduces an 'extended' Weyl gauge theory (eWGT) with a novel transformation law, providing a more general, scale-invariant gravitational framework that includes matter fields and derives new field equations.

Findings

Proposes the 'extended' Weyl gauge theory (eWGT) with a generalized transformation law.

Derives the most general parity-invariant quadratic Lagrangian for eWGT.

Shows that Poincaré gauge theories with local dilations are special cases of WGT and eWGT.

Abstract

We consider the construction of gauge theories of gravity, focussing in particular on the extension of local Poincar\'e invariance to include invariance under local changes of scale. We work exclusively in terms of finite transformations, which allow for a more transparent interpretation of such theories in terms of gauge fields in Minkowski spacetime. Our approach therefore differs from the usual geometrical description of locally scale-invariant Poincar\'e gauge theory (PGT) and Weyl gauge theory (WGT) in terms of Riemann--Cartan and Weyl--Cartan spacetimes, respectively. In particular, we reconsider the interpretation of the Einstein gauge and also the equations of motion of matter fields and test particles in these theories. Inspired by the observation that the PGT and WGT matter actions for the Dirac field and electromagnetic field have more general invariance properties than those imposed by construction, we go on to present a novel alternative to WGT by considering an `extended' form for the transformation law of the rotational gauge field under local dilations, which includes its `normal' transformation law in WGT as a special case. The resulting `extended' Weyl gauge theory (eWGT) has a number of interesting features that we describe in detail. In particular, we present a new scale-invariant gauge theory of gravity that accommodates ordinary matter and is defined by the most general parity-invariant eWGT Lagrangian that is at most quadratic in the eWGT field strengths, and we derive its field equations. We also consider the construction of PGTs that are invariant under local dilations assuming either the `normal' or `extended' transformation law for the rotational gauge field, but show that they are special cases of WGT and eWGT, respectively.