E-modes from acoustic oscillations at last scattering; B-modes from tensor perturbations (primordial GW) or lensing. Planck, BICEP/Keck, Simons Observatory.
E-modes from acoustic oscillations at last scattering; B-modes from tensor perturbations (primordial GW) or lensing. Planck, BICEP/Keck, Simons Observatory.