Geometrodynamics and Lorentz symmetry

3Quantum: Algebra Geometry Information

物理学;数学

Wise, D.K.^1

Department Mathematik, FAU Erlangen-Nurnberg, Cauerstr. 11, Erlangen

91058, Germany^1

关键词: Canonical form;    Gauge fixing;    Gauge symmetries;    Gauge theory;    General Relativity;    Space time symmetry;    Timelike vectors;    Yang-Mills theory;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/532/1/012029/pdf
DOI  :  10.1088/1742-6596/532/1/012029

来源: IOP

【 摘 要 】

We study the dynamics of gauge theory and general relativity using fields of local observers, thus maintaining local Lorentz symmetry despite a space/time splitting of fields. We start with Yang-Mills theory, where observer fields are defined as normalized future-timelike vector fields. We then define observers without a fixed geometry, and find these play two related roles in general relativity: splitting fields into spatial and temporal parts, and 'breaking' gauge symmetry, effectively reducing the spacetime SO(n, 1) connection to an observer-dependent spatial SO(n) connection. In both gauge theory and gravity, the observer field reduces the action to canonical form, without using gauge fixing. In the 4d gravity case, the result is a manifestly Lorentz covariant counterpart of the Ashtekar-Barbero formulation. We also explain how this leads geometrically to a picture of general relativity in terms of 'observer space' rather than spacetime-a setting where both spacetime symmetry and the dynamical description are simultaneously available.