Primordial information content of Rayleigh anisotropies

Anisotropies in the cosmic microwave background (CMB) are primarily generated by Thomson scattering of photons free electrons. Around recombination, probability quickly diminishes as electrons combine with protons to form neutral hydrogen off which CMB can scatter through Rayleigh scattering. Unlike scattering, is frequency dependent resulting generation anisotropies a different spectral dependence. Unfortunately efficiency rapidly decreases expansion universe, result that only small percentage scattered hydrogen. Although effect very small, future missions higher sensitivity and improved coverage poised measure signal. The uncorrelated component contains unique information on primordial perturbations could potentially be leveraged expand our knowledge early universe. In this paper we explore whether measurements used constrain non-Gaussianity (NG) examine hints anomalies found WMAP \textit{Planck} satellites. We show additional has potential improve NG constraints $30\%$, or more. Primordial bispectra not local type benefit most from these scatterings, attribute scale dependence anisotropies. scaling means features large scales. On other hand, may persist smaller scales, such power asymmetry seen \textit{Planck}, addition measurements.