19 papers
Validating direct solvers for Newton's gravitational N-body problem, and the systematic comparison between IEEE floating point and Posits
Simon Portegies Zwart
We present a systematic comparison between arbitrary precise arithmetic and integration, IEEE-754 compliant floating point arithmetic (fp16, bfp16, fp32, double precision fp64, and…
Recoiling Black Holes I. Burst of Observables
Erwan Hochart, Simon Portegies Zwart
We aim to investigate the tidal disruption and gravitational wave events shortly after a massive black hole binary merges in the galactic centre and whose remnant black hole is eje…
Planet-moon ejections in close stellar encounters
Yannick Badoux, Simon Portegies Zwart
Free-floating planet-moon pairs (FFPMs) may form when planetary systems experience close stellar encounters. We quantify moon-retention probabilities and ejection cross sections fo…
ReLaTS: a Reinforcement Learning-based method for dynamically determining the coupling Time Step in multi-scale simulations of self-gravitating systems
Veronica Saz Ulibarrena, Simon Portegies Zwart
Astrophysical simulations frequently address multi-scale, multi-physics problems through subsystem decomposition, problem-tailored integration schemes, and coupling on fixed manual…
Centrally concentrated star formation in young clusters II: Jet feedback
Adilkhan Assilkhan, Sabrina M. Appel, Bekdaulet Shukirgaliyev +5
Protostellar jets are one of the earliest forms of stellar feedback, but their impact on star formation and cluster assembly in centrally concentrated molecular clouds remains poor…
Oort Cloud Ecology -- IV. Exchanging Asteroids
Erwan Hochart, Simon Portegies Zwart
Aims. Investigate the influence of cluster environments on asteroids, with special attention towards captured material. Methods. Using numerical methods, a sub-virial fractally dis…