RT Journal Article
T1 Reformulation of the symmetries of first-order general relativity
A1 Montesinos, Merced
A1 González, Diego
A1 Celada, Mariano
A1 Díaz Jiménez, Bogar
AB We report a new internal gauge symmetry of the n-dimensional Palatini action with cosmological term (n>3) that is the generalization of three-dimensional local translations. This symmetry is obtained through the direct application of the converse of Noether's second theorem on the theory under consideration. We show that diffeomorphisms can be expressed as linear combinations of it and local Lorentz transformations with field-dependent parameters up to terms involving the variational derivatives of the action. As a result, the new internal symmetry together with local Lorentz transformations can be adopted as the fundamental gauge symmetries of general relativity. Although their gauge algebra is open in general, it allows us to recover, without resorting to the equations of motion, the very well-known Lie algebra satisfied by translations and Lorentz transformations in three dimensions. We also report the analog of the new gauge symmetry for the Holst action with cosmological term, finding that it explicitly depends on the Immirzi parameter. The same result concerning its relation to diffeomorphisms and the open character of the gauge algebra also hold in this case. Finally, we consider the non-minimal coupling of a scalar field to gravity in n dimensions and establish that the new gauge symmetry is affected by this matter field. Our results indicate that general relativity in dimension greater than three can be thought of as a gauge theory.
PB IOP Publishing
SN 0264-9381
YR 2017
FD 2017-10-19
LK https://hdl.handle.net/10016/32770
UL https://hdl.handle.net/10016/32770
LA eng
NO We thank Alejandro Perez, Carlo Rovelli, José D Vergara, and José A Zapata for their valuable comments. This work was supported in part by Consejo Nacional de Ciencia y Tecnología (CONACyT), México, Grant No. 237004-F.
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RD 4 ago. 2024