Results 1 to 10 of about 132,645 (167)
Cosmological N-body Simulations [PDF]
Pramana, 2021 This article, published in 1997 is somewhat inaccessible; the present posting is the original ...
Bagla, J. S., Padmanabhan, T.
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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
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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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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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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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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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Self-consistent Spin, Tidal, and Dynamical Equations of Motion in the REBOUNDx Framework
The Astrophysical Journal, 2023 We introduce self-consistent spin, tidal, and dynamical equations of motion into REBOUNDx , a library of additional effects for the popular N -body integrator REBOUND .
Tiger Lu +6 more
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Are long-term N-body simulations reliable? [PDF]
Monthly Notices of the Royal Astronomical Society, 2020 ABSTRACT N-body integrations are used to model a wide range of astrophysical dynamics, but they suffer from errors which make their orbits diverge exponentially in time from the correct orbits. Over long time-scales, their reliability needs to be established. We address this reliability by running a three-body planetary system over about
Junichiro Makino +2 more
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Confirming Resonance in Three Transiting Systems
The Astronomical Journal, 2023 Although resonant planets have orbital periods near commensurability, resonance is also dictated by other factors, such as the planets’ eccentricities and masses, and therefore must be confirmed through a study of the system’s dynamics.
Tyler Quinn, Mariah G. MacDonald
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