Wavelet analysis of non-Gaussian anisotropies from primordial voids in   simulated maps of the Cosmic Microwave Background
  Phase transitions taking place during the inflationary epoch give rise to bubbles of true vacuum embedded in the false vacuum. These bubbles can imprint a distinctive signal on the Cosmic Microwave Background (CMB). We evaluate the feasibility of detecting these signatures with waveletsin CMB maps, such as those that will be made available by the European Space Agency's (ESA) Planck mission. 
Fabio Noviello