Exploring novel cosmological signals with high precision CMB measurements

In pursuit of primordial gravitational waves and constraints on fundamental physics parameters, the next generation of CMB experiments will measure the properties of the millimeter sky with exquisite precision. In this talk I will explore how data sets like these, and beyond, will allow previously unmeasurable signals to be extracted from the millimeter sky. In particular I will focus on two signals: Rayleigh scattering and the intrinsic CMB bispectrum. Rayleigh scattering generates anisotropies after recombination, when Thomson scattering is inefficient, and encodes new information. I will discuss whether this can be used to enhance studies of CMB anomalies and primordial non-Gaussianity. The intrinsic CMB bispectrum is created by the non-linear evolution of cosmological perturbations and is generated even if the primordial universe were purely Gaussian. I will show how this leads to a non-zero coupling between B modes and T/E modes and that this can be used to probe non-linearly generated vector and tensor modes at last scattering.