Cosmological functional renormalization group, extended Galilean invariance, and approximate solutions to the flow equations

The functional renormalisation group is employed to study the non-linear regime of late-time cosmic structure formation. This framework naturally allows for non-perturbative approximation schemes, usually guided by underlying symmetries or a truncation theory space. An extended symmetry that related Galilean invariance studied and corresponding Ward identities are derived. These used obtain (formally) closed flow equations two-point correlation functions in limit large wave numbers (small scales). analytically solved an connected 'sweeping effect' previously described context fluid turbulence.