Zobrazeno 1 - 10
of 128
pro vyhledávání: '"Shandarin, Sergei F."'
Matter density is formally infinite at the location of caustic surfaces, where dark matter sheet folds in phase-space. The caustics separate regions with different number of streams and the volume elements change the parity by turning inside out when
Externí odkaz:
http://arxiv.org/abs/1906.05920
Mysterious dark matter constitutes about 85% of all mass in the Universe. Clustering of dark matter plays the dominant role in the formation of all observed structures on scales from a fraction to a few hundreds of Mega-parsecs. Galaxies play a role
Externí odkaz:
http://arxiv.org/abs/1706.04058
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 -
Externí odkaz:
http://arxiv.org/abs/1609.08554
Publikováno v:
Monthly Notices of the Royal Astronomical Society (2017) 467 (2): 1748-1762
Topological connections in the single-streaming voids and multistreaming filaments and walls reveal a cosmic web structure different from traditional mass density fields. A single void structure not only percolates the multistream field in all the di
Externí odkaz:
http://arxiv.org/abs/1608.05469
Publikováno v:
Monthly Notices of the Royal Astronomical Society (2015) 452 (2): 1643-1653
We report the results of the first study of the multi-stream environment of dark matter haloes in cosmological N-body simulations in the LCDM cosmology. The full dynamical state of dark matter can be described as a three-dimensional sub-manifold in s
Externí odkaz:
http://arxiv.org/abs/1412.7768
A new computational paradigm for the analysis of substructure of the Cosmic Web in cosmological cold dark matter simulations is proposed. We introduce a new data-field --- the flip-flop field ---which carries wealth of information about the history a
Externí odkaz:
http://arxiv.org/abs/1409.7634
We describe how the dynamics of cosmic structure formation defines the intricate geometric structure of the spine of the cosmic web. The Zeldovich approximation is used to model the backbone of the cosmic web in terms of its singularity structure. Th
Externí odkaz:
http://arxiv.org/abs/1311.7134
Tessellations are valuable both conceptually and for analysis in the study of the large-scale structure of the universe. They provide a conceptual model for the 'cosmic web,' and are of great use to analyze cosmological data. Here we describe tessell
Externí odkaz:
http://arxiv.org/abs/1207.4501
Autor:
Shandarin, Sergei F.
A new numerical technique to identify the cosmic web is proposed. It is based on locating multi-stream flows, i.e. the places where the velocity field is multi-valued. The method is local in Eulerian space, simple and computaionally efficient. This t
Externí odkaz:
http://arxiv.org/abs/1011.1924
We present a novel method for computing the Minkowski Functionals from isodensity surfaces extracted directly from the Delaunay tessellation of a point distribution. This is an important step forward compared to the previous cosmological studies when
Externí odkaz:
http://arxiv.org/abs/1006.4178