Speaker
Description
We discuss the dynamics and dynamical evolution of the cosmic web. We first evaluate the inventory of the gravitational force and tidal field induced by filaments, walls, cluster nodes and voids on Megaparsec scales. On the basis of the MMF/NEXUS+ multiscale morphological procedure for the classification and identification of the cosmic web element, at each location the contribution by each ofthe cosmic web components to the local gravitational and tidal forces is determined.
It is shown that filaments represent the overpowering gravitational agent of the cosmic web. Voids reveal themselves as the next major influence, through their characteristic divergent outflow pattern. Their tidal influence is responsible for the cellular tapestry of multiscale cosmic web. On the basis of the premise that the spatial structure of the tidal field determines the pattern and connectivity of the cosmic web, we subsequently extend our study towards a full phase-space based analysis of the evolving cosmic mass distribution. From the Lagrangian formulation we infer the implied emergence and hierarchical evolution of spatial singularities in the evolving mass distribution.
It yields a fully nonlinear analytical formalism for the dynamical buildup of the pattern and connectivity of the cosmic web, the Caustic Skeleton. It identifies the structural components of the cosmic web with the mathematical classification of the emerging singularities and their corresponding multistream signature. We will conclude with
the recent constrained simulations of dynamically defined walls and filaments, and the properties of the gaseous content and galaxy populations related to the various structural multistream structures in the cosmic web.
