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Colloquium by Pengjie Zhang (SJTU)

ABS, CMB foreground removal, weak lensing reconstruction by counting galaxies, and beyond


We present an Analytical method of Blind Separation (ABS) as a solution to CMB foreground removal, weak lensing reconstruction through cosmic magnification, the thermal Sunyaev Zel'dovich effect measurement, and beyond. We formulate the above questions into the same mathematical structure, for which we have discovered the analytical solution of the desired cosmological signal, free of assumptions of undesired foregrounds/contaminations. We have tested this method against simulated CMB B-mode observations and cosmic magnification in galaxy distribution, and demonstrated its robustness against various observational and astrophysical complexities. We believe that the ABS method should have more general applications. Therefore the major purpose of this talk is to introduce the ABS method and to explore new applications.

Time: May 3, 2017, 14:30 pm

Venue: A601, NAOC