Constraint on noncommutative spacetime from PLANCK data
  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.
