NPA Zoom Seminar, Kimmy Wu, SLAC/KIPAC, "Improved Constraint on Primordial Gravitational Waves with Delensing"
Inflation generically predicts a background of primordial gravitational waves, which generate a primordial B-mode component in the polarization of the cosmic microwave background (CMB). The measurement of such a B-mode signature would lend significant support to the paradigm of inflation. Observed B modes also contain a component from the gravitational lensing of primordial E modes, which can obscure the measurement of the primordial B modes.