Deanna tells us about what we could learn from future measurements of the spectral distortions in the CMB, as well as how spectral distortions complement current and future measurements of CMB anisotropies. She also discusses CLASS (v3.0), the code you can use to calculate predictions for both.

There is a guaranteed spectral distortion signal to detect within ΛCDM and the possibility to constrain many possible deviations, including primordial black holes and decaying dark matter. In fact, we can detect the signal even if the PBHs and/or decaying dark matter only make up one part in a million of the total dark matter!

Paper: https://arxiv.org/abs/1910.04619​
Deanna: https://www2.ulb.ac.be/sciences/physth/people_DCHooper.html
Twitter: https://twitter.com/DCHooper91​
CLASS: https://lesgourg.github.io/class_public/class.html