3 papers
astro-ph.CO2025
On the shape of pancakes: catastrophe theory and Gaussian statistics in 2D
Abineet Parichha, Stephane Colombi, Shohei Saga +1
Cold dark matter (CDM) can be thought of as a 2D (or 3D) sheet of particles in 4D (or 6D) phase-space due to its negligible velocity dispersion. The large-scale structure, also cal…
astro-ph.CO2025
Post-collapse Lagrangian perturbation theory in three dimensions
Shohei Saga, Stéphane Colombi, Atsushi Taruya +2
The gravitational collapse of collisionless matter leads to shell-crossing singularities that challenge the applicability of standard perturbation theory. Here, we present the firs…
astro-ph.CO2025
Dark matter halo dynamics in 2D Vlasov Simulations: a self-similar approach
Abineet Parichha, Stephane Colombi, Shohei Saga +1
Understanding dark matter halo dynamics can be pivotal in unravelling the nature of dark matter particles. Analytical treatment of the multistream flows inside the turnaround regio…