ABS: an Analytical method of Blind Separation of CMB from foregrounds
  Extracting CMB B-mode polarization from complicated foregrounds is a
challenging task in searching for inflationary gravitational waves. We propose
the ABS method as a blind and analytical solution to this problem. It applies
to the measured cross bandpower between different frequency bands and obtains
the CMB B-mode bandpower analytically. It does not rely on assumptions of
foregrounds and does not require multiple parameter fitting. Testing against a
variety of foregrounds, survey frequency configurations and instrument noise,
we verify its applicability and numerical stability. The ABS method also
applies to CMB temperature, E-mode polarization, the thermal Sunyaev Zel'dovich
effect, spectral distortion, and even significantly different problems such as
cosmic magnification.
