Noncommutative Corrections to the Robertson-Walker metric - High Energy Physics - TheoryReport as inadecuate




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Abstract: Upon applying Chamseddine-s noncommutative deformation of gravity we obtainthe leading order noncommutative corrections to the Robertson-Walker metrictensor. We get an isotropic inhomogeneous metric tensor for a certain choice ofthe noncommutativity parameters. Moreover, the singularity of the commutativemetric at $t=0$ is replaced by a more involved space-time structure in thenoncommutative theory. In a toy model we construct a scenario where there is nosingularity at $t=0$ at leading order in the noncommutativity parameter.Although singularities may still be present for nonzero $t$, they need not bethe source of all time-like geodesics and the result resembles a bouncingcosmology.



Author: S. Fabi, B. Harms, A. Stern

Source: https://arxiv.org/







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