2013-06-24

UTAPwiki/セミナー/初期宇宙・相対論速報

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.