Abstract Details
| Name: Barun Kumar Pal Affiliation: IUCAA, Pune, India Conference ID: ASI2015_697 Title : Reconstruction of intrinsic CMB power spectra through direct matrix inversion Authors and Co-Authors : Aditya Rotti, Tarun Souradeep; IUCAA, Pune Abstract Type : Abstract Category : Sun and the Solar System Abstract : We study the propagation of error in delensing through direct matrix inversion for a fixed lensing potential, assuming a PRISM like experiment. We find that without binning the reconstructed $C_\cl$, it is very difficult to detect lensing signal in $TT$ power spectrum, but can be detected in $EE$ spectrum at high multipoles. But, if we bin the reconstructed CMB power spectra, lensing can be detected from $\cl\sim400$ and $\cl\sim200$ in CMB $TT$ and $EE$ spectra respectively with bin width, $\Delta\ell= 51$. Not only that, it may be possible to detect the lensing signal in $B$ modes even without binning. Also, for the first time the full covariance matrices for the lensed CMB power spectra in the full spherical sky limit has been presented. Using these covariance matrices, that are accurate upto the second order in lensing potential, we have also reconfirmed that weak lensing increases the cosmic variance by a small amount. |