The features of the Cosmic Web unveiled by the flip-flop field
View/ Open
Issue Date
2017-07-11Author
Shandarin, Sergei F.
Medvedev, Mikhail V.
Publisher
Oxford University Press
Type
Article
Article Version
Scholarly/refereed, publisher version
Rights
© 2017 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society
Metadata
Show full item recordAbstract
Currently the dark matter environment is widely accepted as a framework for understanding of the observed structure in the universe. N-body simulations are indispensable for the analysis of the formation and evolution of the dark matter web. Two primary fields – density and velocity fields – are used in most of studies. Dark matter provides two additional fields that are unique for collisionless media only. They are the multistream field in Eulerian space and flip-flop field in Lagrangian space. The flip-flop field represents the number of sign reversals of an elementary volume of each collisionless fluid element. This field can be estimated by counting the sign reversals of the Jacobian at each particle at every time step of the simulation. The Jacobian is evaluated by numerical differentiation of the Lagrangian submanifold, i.e. the three-dimensional dark matter sheet in the six-dimensional space formed by three Lagrangian and three Eulerian coordinates. We present the results of the statistical study of the evolution of the flip-flop field from z = 50 to the present time z = 0. A number of statistical characteristics show that the pattern of the flip-flop field remains remarkably stable from z ≈ 30 to the present time. As a result the flip-flop field evaluated at z = 0 stores a wealth of information about the dynamical history of the dark matter web. In particular one of the most intriguing properties of the flip-flop is a unique capability to preserve the information about the merging history of haloes.
Collections
Citation
Sergei F. Shandarin, Mikhail V. Medvedev; The features of the Cosmic Web unveiled by the flip-flop field, Monthly Notices of the Royal Astronomical Society, Volume 468, Issue 4, 11 July 2017, Pages 4056–4076, https://doi.org/10.1093/mnras/stx699
Items in KU ScholarWorks are protected by copyright, with all rights reserved, unless otherwise indicated.
We want to hear from you! Please share your stories about how Open Access to this item benefits YOU.