[[UTAPwiki/セミナー/初期宇宙・相対論速報]] Yamauchi, TBA Speaker: Daisuke Yamauchi (RESCEU) Title: CMB ISW-lensing bispectrum from cosmic strings Abstract: We study the effect of weak lensing by cosmic strings on the CMB anisotropies. In the presence of the cross correlation between the temperature fluctuations and the lensing potential, the non-vanishing bispectrum will appear. A cosmic string network is expected to produce the ISW-lensing bispectrum. In developing an analytic method to calculate the correlations between strings, we give the explicit expression for the auto-power spectrum for the ISW effect due to the cosmic string network and the cross-correlation power spectrum between the ISW effect and the lensing potential induced by the cosmic string network. |