http://arxiv.org/abs/1912.00868
Gravitational collapse of cold dark matter leads to infinite-density caustics that seed the primordial dark-matter halos in the large-scale structure. The development of these caustics begins, generically, as an almost one-dimensional phenomenon with the formation of pancakes. Focusing on the one-dimensional case, we identify a landscape of so far unknown singularities in the particle acceleration that emerge after the first crossing of particle trajectories. We complement our fully analytical studies by high-resolution N-body simulations and find outstanding agreement, particularly shortly after the first crossing. We develop the methods in 1D but outline briefly the necessary steps for the 3D case.
C. Rampf, U. Frisch and O. Hahn
Tue, 3 Dec 19
35/90
Comments: 5 pages + references, 2 figures, to be submitted to PRL (the accompanied numerical code can be downloaded from this https URL)