Scale-invariant gauge theories of gravity: Theoretical foundations

Abstract

We consider the construction of gauge theories of gravity, focussing in particular on the extension of local Poincaré 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 Poincaré 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.

Geometric Algebra, Gravity and Gravitational Waves

“…The fact that GTG is based upon the localising the symmetries of rotation and translation, suggests strongly that the extension to local scale-invariance should be looked at as well. In fact the foundations of a complete theory along these lines has now been developed, and written up (so far only in a translation into conventional tensor notation) in Lasenby & Hobson [27]. In these approaches, it turns out that torsion becomes an inescapable component of the propagation of gravitational waves, with new physical effects comparable to the interplay between electric and magnetic fields in the propagation of EM waves.…”

Ghost and tachyon free Poincaré gauge theories: A systematic approach

“…Finally, although we demonstrated our method only for PGT + in this paper, it may be applied to more complex theories such as Weyl gauge theory (WGT) [27] or extended Weyl gauge theory (eWGT) [16]. It is also applicable to conventional metric theories such as R 2 theories.…”

Geometric Algebra as a Unifying Language for Physics and Engineering and Its Use in the Study of Gravity

“…With a colleague (Mike Hobson) we have now finished writing up the theoretical foundations of the work [13]. (This first paper is unfortunately (for current purposes) not in GA notation, and indeed conversion of some parts of this to conventional notation was one of the hardest tasks associated with the work!)…”