Zvonimir Vlah - November 10, 2017

Including stream crossing in Lagrangian perturbation theory

I will discuss the path integral formalism for the clustering of the
large-scale structure of the Universe presented in recent paper arXiv:
1709.02834. Formalism describes the perturbative approach that from the
start includes the stream crossing effects, i.e. multiple velocities for
mass elements at a single position. Starting from a functional integral
of displacement field, perturbative series is constructed by expansion
in deviations from (truncated) Zel'dovich evolution, obtaining terms
that can be computed exactly including the displacements that have
crossed streams. I will also discuss current results and implications in
the context of ongoing and upcoming large-scale structure surveys.