Planck-scale physics vs Galactic astrophysics – on the need and requirements for the high-quality full-sky low-frequency microwave polarization survey

We discuss the great need for future improvement of polarization measurements at low frequencies, and we recommend study of a mission dedicated to those low frequencies, to determine whether such a mission, combined with a higher-frequency mission, would be the most cost-effective way to obtain sufficient data to probe inflation by CMB science.