Mapping Cosmological Observables to the Dark Kinetics

Understand

We study systematically which features in the cosmic microwave background (CMB) and large-scale structure (LSS) probe various inhomogeneous properties of the dark sectors (including neutrinos, dark matter, and dark energy).

• We stress, and quantify by simple formulas, that the primary CMB anisotropies are very susceptible to the gravitational potentials during horizon entry, less at recombination.
• The CMB thus allows us to scan \Phi+\Psi and the underlying dark kinetics for all redshifts z~1-10^5.
• LSS, on the other hand, responds strongest to \Phi at low redshifts.