Emergent Gravity from Noncommutative Gauge Theory
Abstract
We show that the matrix-model action for noncommutative U(n) gauge theory actually describes SU(n) gauge theory coupled to gravity. This is elaborated in the 4-dimensional case. The SU(n) gauge fields as well as additional scalar fields couple to an effective metric G_{ab}, which is determined by a dynamical Poisson structure. The emergent gravity is intimately related to noncommutativity, encoding those degrees of freedom which are usually interpreted as U(1) gauge fields. This leads to a class of metrics which contains the physical degrees of freedom of gravitational waves, and allows to recover e.g. the Newtonian limit with arbitrary mass distribution. It also suggests a consistent picture of UV/IR mixing in terms of an induced gravity action. This should provide a suitable framework for quantizing gravity.
Keywords
Cite
@article{arxiv.0708.2426,
title = {Emergent Gravity from Noncommutative Gauge Theory},
author = {Harold Steinacker},
journal= {arXiv preprint arXiv:0708.2426},
year = {2009}
}
Comments
28 pages + 11 pages appendix. V2: references and discussion added. V3: minor correction