Probing CMB Cold Spot through Local Minkowski Functionals
  Both WMAP and PLANCK missions reported the extremely Cold Spot (CS) centered
at Galactic coordinate ($l=209^{\circ}$, $b=-57^{\circ}$) in CMB map. In this
paper, we study the local non-Gaussianity of CS by defining the local Minkowski
functions. We find that the third Minkowski function $\nu_2$ is quite sensitive
to the non-Gaussianity caused by CS. Compared with the random Gaussian
simulations, WMAP CS deviates from Gaussianity at more than 99% confident level
at the scale $R\sim10^{\circ}$. Meanwhile, we find that cosmic texture provides
an excellent explanation for these anomalies related to WMAP CS, which could be
further tested by the future polarization data.
