Constraints from CMB on Spacetime Noncommutativity and Causality Violation
Astrophysics
2009-03-24 v1 General Relativity and Quantum Cosmology
High Energy Physics - Theory
Abstract
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.
Keywords
Cite
@article{arxiv.0806.2458,
title = {Constraints from CMB on Spacetime Noncommutativity and Causality Violation},
author = {Earnest Akofor and A. P. Balachandran and Anosh Joseph and Larne Pekowsky and Babar A. Qureshi},
journal= {arXiv preprint arXiv:0806.2458},
year = {2009}
}
Comments
15 pages, 6 figures