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The features of the Cosmic Web unveiled by the flip-flop field
- Source :
- Monthly Notices of the Royal Astronomical Society. 468:4056-4076
- Publication Year :
- 2017
- Publisher :
- Oxford University Press (OUP), 2017.
-
Abstract
- Understanding of the observed structure in the universe can be reached only in the theoretical framework of dark matter. 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. However dark matter provides two additional fields which are unique for collisionless media only. These are the multi- stream 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 dark matter haloes.<br />Comment: 19 pages, 25 figures, submitted to MNRAS
- Subjects :
- Physics
Cosmology and Nongalactic Astrophysics (astro-ph.CO)
Field (physics)
010308 nuclear & particles physics
Dark matter
Scalar field dark matter
FOS: Physical sciences
Astronomy and Astrophysics
Eulerian path
Space (mathematics)
01 natural sciences
symbols.namesake
Theoretical physics
Classical mechanics
Space and Planetary Science
0103 physical sciences
Dark energy
symbols
010303 astronomy & astrophysics
Dark fluid
Astrophysics - Cosmology and Nongalactic Astrophysics
Sign (mathematics)
Subjects
Details
- ISSN :
- 13652966 and 00358711
- Volume :
- 468
- Database :
- OpenAIRE
- Journal :
- Monthly Notices of the Royal Astronomical Society
- Accession number :
- edsair.doi.dedup.....15761c64d21a68c154c7e11f376c66a4
- Full Text :
- https://doi.org/10.1093/mnras/stx699