ORIGAMI: Delineating Cosmic Structures with Phase-Space Folds

Abstract

Structures like galaxies and filaments of galaxies in the Universe come about from the origami-like folding of an initially flat three-dimensional manifold in 6D phase space. The ORIGAMI method identifies these structures in a cosmological simulation, delineating the structures according to their outer folds. Structure identification is a crucial step in comparing cosmological simulations to observed maps of the Universe. The ORIGAMI definition is objective, dynamical and geometric: filament, wall and void particles are classified according to the number of orthogonal axes along which dark-matter streams have crossed. Here, we briefly review these ideas, and speculate on how ORIGAMI might be useful to find cosmic voids.

Talk summary to appear in the Proceedings of the 13th Marcel Grossmann Meeting (MG13), Stockholm, July 2012. 3 pages, 3 figures

Cited by in corpus (6)

• Past and present cosmic structure in the SDSS DR7 main sample
• The features of the Cosmic Web unveiled by the flip-flop field
• The cosmic spiderweb: equivalence of cosmic, architectural, and origami tessellations
• Tetrahedral collapse: a rotational toy model of simultaneous dark-matter halo, filament and wall formation
• VIDE: The Void IDentification and Examination toolkit
• The Boosted Potential