Results 1 to 10 of about 141,991 (169)
N-body simulations for parametrized modified gravity [PDF]
Monthly Notices of the Royal Astronomical Society, 2020 ABSTRACT We present MG-evolution, an N-body code simulating the cosmological structure formation for parametrized modifications of gravity. It is built from the combination of parametrized linear theory with a parametrization of the deeply non-linear cosmological regime extrapolated from modified spherical collapse computations that ...
Lucas Lombriser, Farbod Hassani
exaly +4 more sources
Planetesimal Accretion at Short Orbital Periods
The Astrophysical Journal, 2023 Formation models in which terrestrial bodies grow via the pairwise accretion of planetesimals have been reasonably successful at reproducing the general properties of the Solar System, including small-body populations. However, planetesimal accretion has
Spencer C. Wallace, Thomas R. Quinn
doaj +1 more source
On the reliability of N-body simulations [PDF]
Computational Astrophysics and Cosmology, 2015 AbstractThe general consensus in the N-body community is that statistical results of an ensemble of collisional N-body simulations are accurate, even though individual simulations are not. A way to test this hypothesis is to make a direct comparison of an ensemble of solutions obtained by conventional methods with an ensemble of true solutions.
Boekholt, T.C.N., Portegies Zwart, S.F.
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Accelerating Polyhedral Discrete Element Method with CUDA
The Astronomical Journal, 2023 This paper presents an efficient CUDA-based implementation of a nonspherical discrete element method where irregular particles are described by using polyhedrons. Two strategies are employed to exploit the parallelism of the numerical method.
Tongge Wen, Xiangyuan Zeng
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Cosmological Neutrino N-Body Simulations of Dark Matter Halo
Universe, 2023 The study of massive neutrinos and their interactions is a critical aspect of contemporary cosmology. Recent advances in parallel computation and high-performance computing provide new opportunities for accurately constraining Large-Scale Structures (LSS)
Yu Chen +5 more
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Triaxiality Inhibitors in N-body Simulations [PDF]
The Astrophysical Journal, 2018 Abstract Numerous previous studies have investigated the phenomenon wherein initially spherical N-body systems are distorted to triaxial shapes. We report on an investigation of a previously described orbital instability that should oppose triaxiality.
Eric I. Barnes, Evan Dowling
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The Spherical Fast Multipole Method (sFMM) for Gravitational Lensing Simulation
The Astrophysical Journal, 2023 In this paper, we present a spherical Fast Multipole Method (sFMM) for ray-tracing simulation of gravitational lensing on a curved sky. The sFMM is a nontrivial extension of the Fast Multiple Method to sphere ${{\mathbb{S}}}^{2}$ , and it can accurately ...
Xingpao Suo +3 more
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Experiences with parallel N-body simulation [PDF]
IEEE Transactions on Parallel and Distributed Systems, 1994 This paper describes our experiences developing high-performance code for astrophysical N-body simulations. Recent N-body methods are based on an adaptive tree structure. The tree must be built and maintained across physically distributed memory; moreover, the communication requirements are irregular and adaptive.
Pangfeng Liu, Sandeep N. Bhatt
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N-Body Simulation on Hybrid Architectures [PDF]
, 2001 N-body codes are routinely used for simulation studies of physical systems, e.g. in the fields of computational astrophysics and molecular dynamics. Typically, they require only a moderate amount of run-time memory, but are very demanding in computational power.
Sloot, P.M.A. +2 more
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Field-level Neural Network Emulator for Cosmological N-body Simulations
The Astrophysical Journal, 2023 We build a field-level emulator for cosmic structure formation that is accurate in the nonlinear regime. Our emulator consists of two convolutional neural networks trained to output the nonlinear displacements and velocities of N -body simulation ...
Drew Jamieson +5 more
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