Constraint on noncommutative spacetime from PLANCK data

TL;DR

This paper uses PLANCK CMB data to set a lower bound of about 20 TeV on the energy scale of noncommutative spacetime, improving previous constraints and showing polarization data has minimal impact.

Contribution

It provides the first constraint on noncommutative spacetime energy scale using PLANCK data, surpassing earlier bounds from WMAP, ACBAR, and CBI.

Findings

PLANCK data constrains noncommutative energy scale to ~20 TeV

Inclusion of E-mode polarization data does not significantly alter the constraint

The bound is roughly twice as stringent as previous limits

Abstract

We constrain the energy scale of noncommutativity of spacetime using CMB data from PLANCK. We find that PLANCK data puts the lower bound on the noncommutativity energy scale to about 20 TeV, which is about a factor of two larger than a previous constraint that was obtained using data from WMAP, ACBAR and CBI. We further show that inclusion of data of $E$ mode of CMB polarization will not significantly change the constraint.