Speaker
Mark Neyrinck
(Blue Marble Space Institute of Science (BMSIS))
Description
I will discuss some benefits of using caustics (boundaries of stream/shell crossing) to delineate cosmic web components. Our original ORIGAMI (Order-ReversIng Gravity, Apprehended Mangling Indices) algorithm explicitly looks for particle crossings, but much of the tagging works simply by looking for out-of-order particles along orthogonal axes, and then filling in holes. It is also important to identify differences between this approach and others; e.g. Friends-of-Friends haloes viewed in Lagrangian initial coordinates often have holes near their edges.
Primary author
Mark Neyrinck
(Blue Marble Space Institute of Science (BMSIS))
