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Collisionless Dynamics and the Cosmic Web

Published online by Cambridge University Press:  12 October 2016

Oliver Hahn
Oliver Hahn*
Affiliation:
Department of Physics, ETH Zurich, CH-8093 Zürich, Switzerland email: hahn@phys.ethz.ch
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Abstract

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I review the nature of three-dimensional collapse in the Zeldovich approximation, how it relates to the underlying nature of the three-dimensional Lagrangian manifold and naturally gives rise to a hierarchical structure formation scenario that progresses through collapse from voids to pancakes, filaments and then halos. I then discuss how variations of the Zeldovich approximation (based on the gravitational or the velocity potential) have been used to define classifications of the cosmic large-scale structure into dynamically distinct parts. Finally, I turn to recent efforts to devise new approaches relying on tessellations of the Lagrangian manifold to follow the fine-grained dynamics of the dark matter fluid into the highly non-linear regime and both extract the maximum amount of information from existing simulations as well as devise new simulation techniques for cold collisionless dynamics.

Keywords

cosmology: theorydark matterlarge-scale structure of universemethods: numerical
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 11 , Symposium S308: The Zeldovich Universe: Genesis and Growth of the Cosmic Web , June 2014 , pp. 87 - 96
Copyright
Copyright © International Astronomical Union 2016 

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