The features of the Cosmic Web unveiled by the flip-flop field / Shandarin Sergei F.,Medvedev Mikhail V. // MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY. - 2017. - V. 468, l. 4. - P. 4056-4076.

ISSN/EISSN:

0035-8711 / 1365-2966

Type:

Article

Abstract:

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 approximate to 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.

Author keywords:

methods: numerical; dark matter; large-scale structure of Universe; cosmology: theory LARGE-SCALE STRUCTURE; N-BODY SIMULATIONS; DARK-MATTER HALOES; ADHESION MODEL; GALACTIC HALOS; PHASE-SPACE; UNIVERSE; EVOLUTION; GALAXIES; CLUSTERS

DOI:

10.1093/mnras/stx699

Web of Science ID:

ISI:000402819700025

Соавторы в МНС:

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Другие поля

Поле	Значение
Month	JUL
Publisher	OXFORD UNIV PRESS
Address	GREAT CLARENDON ST, OXFORD OX2 6DP, ENGLAND
Language	English
EISSN	1365-2966
Keywords-Plus	LARGE-SCALE STRUCTURE; N-BODY SIMULATIONS; DARK-MATTER HALOES; ADHESION MODEL; GALACTIC HALOS; PHASE-SPACE; UNIVERSE; EVOLUTION; GALAXIES; CLUSTERS
Research-Areas	Astronomy \& Astrophysics
Web-of-Science-Categories	Astronomy \& Astrophysics
Author-Email	sergei@ku.edu
Funding-Acknowledgement	Templeton Foundation; DOE; NSF {[}DE-FG02-07ER54940, AST-1209665]
Funding-Text	SS acknowledges support by the Templeton Foundation program `The emergence of complex structural patterns: A manifistation of increasing cosmic complexity' and sabbatical support at Kapteyn Astronomical Institute at the University of Groningen The Netherlands and by Argonne National Labs where the significant part of the work was done. SS also thanks S. Habib for fruitful discussions. The authors are grateful to S.D.M. White for useful critical comments on the first draft of the paper. MM acknowledges partial support by DOE and NSF via grants DE-FG02-07ER54940 and AST-1209665. The authors are grateful to the anonymous referee for useful suggestions and constructive criticism.
Number-of-Cited-References	46
Journal-ISO	Mon. Not. Roy. Astron. Soc.
Doc-Delivery-Number	EW9EN