Constraints from CMB on Spacetime Noncommutativity and Causality Violation

Akofor, E. and Balachandran, A. P. and Joseph, A. and Pekowsky, L. and Qureshi, B. A. (2008) Constraints from CMB on Spacetime Noncommutativity and Causality Violation. (Preprint)

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Abstract

We try to constrain the noncommutativity length scale of the theoretical model given in [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.

Item Type: Article
Divisions: School of Theoretical Physics > Preprints
Date Deposited: 19 Jun 2018 13:47
Last Modified: 13 Jul 2018 11:24
URI: http://dair.dias.ie/id/eprint/501

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