Perturbation theory with dispersion and higher cumulants: Nonlinear regime

Abstract

The authors develop an alternative perturbative approach to gravitational clustering and the large-scale structure. This approach is complementary to the effective field theory approach while being much more predictive and providing a more detailed understanding of mechanisms like the decoupling of nonlinear small-scale modes into dark matter halos where standard perturbation theory completely fails. This is an exciting step into the future of making predictions, especially in light of upcoming Stage IV experiments.