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arxiv: 0808.0943 · v1 · submitted 2008-08-07 · ✦ hep-th · gr-qc

Noncommutative Corrections to the Robertson-Walker metric

classification ✦ hep-th gr-qc
keywords metricnoncommutativecorrectionsleadingnoncommutativityorderrobertson-walkersingularity
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Upon applying Chamseddine's noncommutative deformation of gravity we obtain the leading order noncommutative corrections to the Robertson-Walker metric tensor. We get an isotropic inhomogeneous metric tensor for a certain choice of the noncommutativity parameters. Moreover, the singularity of the commutative metric at $t=0$ is replaced by a more involved space-time structure in the noncommutative theory. In a toy model we construct a scenario where there is no singularity at $t=0$ at leading order in the noncommutativity parameter. Although singularities may still be present for nonzero $t$, they need not be the source of all time-like geodesics and the result resembles a bouncing cosmology.

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