Constraints from CMB on Spacetime Noncommutativity and Causality Violation

Details Constraints from CMB on Spacetime Noncommutativity and Causality Violation Constraints from CMB on Spacetime Noncommutativity and Causality Violation

2008-06-15

arxiv.org/abs/0806.2458v1

Phys.Rev.D79:063004,2009

Astronomy and Astrophysics

Astrophysics

15 pages, 6 figures

Scientific paper

10.1103/PhysRevD.79.063004

We try to constrain the noncommutativity length scale of the theoretical model given in Ref. [1] using the observational data from ACBAR, CBI and five year WMAP. The noncommutativity parameter is not constrained by WMAP data, however ACBAR and CBI data restrict the lower bound of its energy scale to be around 10 TeV. We also derive an expression for the amount of non-causality coming from spacetime noncommutativity for the fields of primordial scalar perturbations that are space-like separated. The amount of causality violation for these field fluctuations are direction dependent.

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