Scale-invariant gauge theories of gravity: theoretical foundations
  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.
