Galilean invariant resummation schemes of cosmological perturbations
  Many of the methods proposed so far to go beyond Standard Perturbation Theory
break invariance under time-dependent boosts (denoted here as extended Galilean
Invariance, or GI). This gives rise to spurious large scale effects which spoil
the small scale predictions of these approximation schemes. By using
consistency relations we derive fully non-perturbative constraints that GI
imposes on correlation functions. We then introduce a method to quantify the
amount of GI breaking of a given scheme, and to correct it by properly tailored
counterterms. Finally, we formulate resummation schemes which are manifestly
GI, discuss their general features, and implement them in the so called
Time-Flow, or TRG, equations.
