The Origami Cosmic Web

Mark Neyrinck, Physics and Astronomy


In the current cosmological paradigm, an initially flat three-dimensional manifold that pervades space (the `dark-matter sheet’) folds up to build concentrations of mass (galaxies), and a cosmic web between them. Galaxies are nodes, connected by a network of filaments and walls. The folding is in six-dimensional (3D position, plus 3D velocity) phase space. The positions of creases, or caustics, mark the edges of structures. In this Poster, I schematically demonstrate this structure-formation process with paper origami, using data from the public VIPERS survey of galaxies.