Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2007-08-20
JHEP 0712:049,2007
Physics
High Energy Physics
High Energy Physics - Theory
28 pages + 11 pages appendix. V2: references and discussion added. V3: minor correction
Scientific paper
10.1088/1126-6708/2007/12/049
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.
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