Local spin base invariance from a global differential-geometrical point of view
Abstract
This article gives a geometric interpretation of the spin base formulation with local spin base invariance of spinors on a curved space-time and in particular of a central element, the global Dirac structure, in terms of principal and vector bundles and their endomorphisms. It is shown that this is intimately related to Spin and Spin^C structures in the sense that the existence of one of those implies the existence of a Dirac structure and allows an extension to local spin base invariance. Vice versa, as a central result, the existence of a Dirac structure implies the existence of a Spin^C structure. Nevertheless, the spin base invariant setting may be considered more general, allowing more physical degrees of freedom. Furthermore, arguments are given that the Dirac structure is a more natural choice as a variable for (quantum) gravity than tetrads/vielbeins.
Keywords
Cite
@article{arxiv.2111.12023,
title = {Local spin base invariance from a global differential-geometrical point of view},
author = {Claudio Emmrich},
journal= {arXiv preprint arXiv:2111.12023},
year = {2022}
}