Multiparticle collision simulations of dense stellar systems and plasmas

• Published in: arXiv.org
• Main Authors: P Di Cintio, Pasquato, M, Barbieri, L, Bufferand, H, Casetti, L, Ciraolo, G, Di Carlo, U N, Ghendrih, P, Gunn, J P, Gupta, S, Kim, H, Lepri, S, Livi, R, Simon-Petit, A, Trani, A A, S -J Yoon
• Format: Paper Journal Article
• Language: English
• Published: Ithaca Cornell University Library, arXiv.org 11.02.2022
• Subjects: Collisional plasmas; Finite element method; Globular clusters; Particle collisions; Particle interactions; Physics - Astrophysics of Galaxies; Plasmas (physics); Simulation; Stellar systems
• ISSN: 2331-8422
• DOI: 10.48550/arxiv.2201.04586

We summarize a series of numerical experiments of collisional dynamics in dense stellar systems such as globular clusters (GCs) and in weakly collisional plasmas using a novel simulation technique, the so-called Multi-particle collision (MPC) method, alternative to Fokker-Planck and Monte Carlo approaches. MPC is related to particle-mesh approaches for the computation of self consistent long-range fields, ensuring that simulation time scales with \(N\log N\) in the number of particles, as opposed to \(N^2\) for direct \(N\)-body. The collisional relaxation effects are modelled by computing particle interactions based on a collision operator approach that ensures rigorous conservation of energy and momenta and depends only on particles velocities and cell-based integrated quantities.