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astro-ph2008★ 31 cited
Bayesian Limits on Primordial Isotropy Breaking
C. Armendariz-Picon, Larne Pekowsky
It is often assumed that primordial perturbations are statistically isotropic, which implies, among other properties, that their power spectrum is invariant under rotations. In thi…
astro-ph2008★ 56 cited
Constraints from CMB on Spacetime Noncommutativity and Causality Violation
Earnest Akofor, A. P. Balachandran, Anosh Joseph +2
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 noncommutativi…