Cosmic microwave background temperature and polarization anisotropics from the large-iV limit of global defects.

We determine the full Q spectra and correlation functions of the temperature and polarization anisotropics in the cosmic microwave background (CMB), generated by a source modeled by the large-V limit of spontaneously broken global OfiVj-theories. We point out a problem in the standard approach of treating the radiation-matter transition by interpolating the eigenvectors of the unequal-time correlators of the source energy-momentum tensor. This affects the CMB predictions from all types of cosmic defects. We propose a method to overcome this difficulty. We find that in the large-V global model that we study, differences in the final CMB power spectra amplitudes reach ~10%-20% in all channels (TT, EE, BB and TE) when compared to implementations of the eigenvector interpolation technique. We also discuss how to optimally search for the contribution in the CMB from active sources such as cosmic defects in experiments like Planck, COrE and PRISM. [ABSTRACT FROM AUTHOR]