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The "Cold Spot" in the CMB sky could be due to the presence of an anomaloushuge spherical underdense region - a "Void" - of a few hundreds Mpc/h radius.Such a structure would have an impact on the CMB two-point (power spectrum) andthree-point (bispectrum) correlation functions not only at low-l, but also athigh-l through Lensing, which is a unique signature of a Void. Modeling such anunderdensity with an LTB metric, we show that for the power spectrum the effectshould be visible already in the WMAP data only if the Void radius is at leastL \gtrsim 1 Gpc/h, while it will be visible by the Planck satellite if L\gtrsim 500 Mpc/h. We also speculate that this could be linked to the high-ldetection of an hemispherical power asymmetry in the sky. Moreover, thereshould be non-zero correlations in the non-diagonal two-point function. For thebispectrum, the effect becomes important for squeezed triangles with two veryhigh l's: this signal can be detected by Planck if the Void radius is at leastL \gtrsim 300 Mpc/h, while higher resolution experiments should be able toprobe the entire parameter space. We have also estimated the contamination ofthe primordial non-Gaussianity f_NL due to this signal, which turns out to benegligible.

The Cold Spot as a Large Void: Lensing Effect on CMB Two and Three Point Correlation Functions