Topology and geometry of the dark matter web: a multistream view

Abstract

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 directions, but also occupies over 99 per cent of all the single-streaming regions. Sub-grid analyses on scales smaller than simulation resolution reveal tiny pockets of voids that are isolated by membranes of the structure. For the multistreaming excursion sets, the percolating structure is significantly thinner than the filaments in over-density excursion approach. Hessian eigenvalues of the multistream field are used as local geometrical indicators of dark matter structures. Single-streaming regions have most of the zero eigenvalues. Parameter-free conditions on the eigenvalues in the multistream region may be used to delineate primitive geometries with concavities corresponding to filaments, walls and haloes.

16 pages, 13 figures. Matches version accepted by MNRAS

References in corpus (10)

• Astrophysics Source Code Library
• ZOBOV: a parameter-free void-finding algorithm
• The Evolution of Dark Matter Halo Properties in Clusters, Filaments, Sheets and Voids
• The Aspen--Amsterdam Void Finder Comparison Project
• SubHaloes going Notts: The SubHalo-Finder Comparison Project
• Earth-mass haloes and the emergence of NFW density profiles
• The Persistent Percolation of Single-Stream Voids
• Voids in cosmological simulations over cosmic time
• The features of the Cosmic Web unveiled by the flip-flop field
• Tracing the Cosmic Web substructure with Lagrangian submanifold

Cited by in corpus (12)

• Tracing the cosmic web
• Massive Neutrinos Leave Fingerprints on Cosmic Voids
• The bias of cosmic voids in the presence of massive neutrinos
• The median density of the Universe
• Redshift remapping and cosmic acceleration in dark-matter-dominated cosmological models
• The features of the Cosmic Web unveiled by the flip-flop field
• Network analysis of the COSMOS galaxy field
• The cosmic spiderweb: equivalence of cosmic, architectural, and origami tessellations
• Cosmic Web & Caustic Skeleton: non-linear Constrained Realizations -- 2D case studies
• Identifying Dark Matter Haloes by the Caustic Boundary
• Dark matter haloes: a multistream view
• Excursion Sets with a "Perfect" Collapse Model