• Home
  • Topology and Geometry of the Dark Matter Web: A Multi-Stream View

Topology and Geometry of the Dark Matter Web: A Multi-Stream View

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 overdensity 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.

Monthly Notices of the Royal Astronomical Society 467, 1748, 2017

Ramachandra*, Nesar S.& Shandarin*, Sergei F. *KU Authors

Department Communications

Colloquia         Seminars         Public Events         AAL



Department            Alumni


Mr. Bob Show              Colloquia

Alumni Remembrances          Public Lectures

Departmental Calendar

Mr. Bob T-Shirts: Lab Support
Home to 50+ departments, centers, and programs, the School of the Arts, and the School of Public Affairs and Administration
KU offers courses in 40 languages
No. 1 ranking in city management and urban policy —U.S. News and World Report
One of 34 U.S. public institutions in the prestigious Association of American Universities
44 nationally ranked graduate programs.
—U.S. News & World Report
KU Today
Yes, there’s a 23-foot-long kiln on campus. Yes, it’s fired up only once per semester. Yes, it’s pretty cool.… https://t.co/OD2iunMK6D

Social Media

Find us on Facebook