Events Daily

Tuesday, January 15, 2019

Weak singularities in large-scale structure: identification and workaround
Cornelius Rampf, Laboratoire Lagrange, CNRS
Event Type: Informal Astro Talk
Time: 2:00 PM - 2:30 PM
Location: 726 Broadway, 940, CCPP Seminar
Description: The large-scale structure of the universe is mostly the consequence of the gravitational clustering of cold dark matter (CDM). Eventually the CDM trajectories begin to intersect ("shell-crossing"), which marks the starting point of elaborate computations in the phase-space. I show that, due to the collisionless nature of CDM, phase-space trajectories exhibit weakly singular behaviour such as local non-differentiability of the particle acceleration. Conventional N-body simulations should be able to handle these features of CDM. Alternatively, singular features may be regulated by employing semiclassical descriptions for the large-scale structure which I will briefly discuss.

Exploring new links in the galaxy halo-connection
Killian Walsh, NYU
Event Type: Thesis Seminar Defense
Time: 3:00 PM - 5:00 PM
Location: 726 Broadway, 940, CCPP Seminar