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  • Technologies for supporting high-order geodesic mesh frameworks for computational astrophysics and space sciences.
    Comput. Astrophys. Cosmol. Pub Date : 2020-03-27
    Vladimir Florinski,Dinshaw S Balsara,Sudip Garain,Katharine F Gurski

    Many important problems in astrophysics, space physics, and geophysics involve flows of (possibly ionized) gases in the vicinity of a spherical object, such as a star or planet. The geometry of such a system naturally favors numerical schemes based on a spherical mesh. Despite its orthogonality property, the polar (latitude-longitude) mesh is ill suited for computation because of the singularity on

    更新日期:2020-03-27
  • Cosmological N-body simulations: a challenge for scalable generative models
    Comput. Astrophys. Cosmol. Pub Date : 2019-12-19
    Nathanaël Perraudin; Ankit Srivastava; Aurelien Lucchi; Tomasz Kacprzak; Thomas Hofmann; Alexandre Réfrégier

    Deep generative models, such as Generative Adversarial Networks (GANs) or Variational Autoencoders (VAs) have been demonstrated to produce images of high visual quality. However, the existing hardware on which these models are trained severely limits the size of the images that can be generated. The rapid growth of high dimensional data in many fields of science therefore poses a significant challenge

    更新日期:2019-12-19
  • A detection metric designed for O’Connell effect eclipsing binaries
    Comput. Astrophys. Cosmol. Pub Date : 2019-11-08
    Kyle B. Johnston; Rana Haber; Saida M. Caballero-Nieves; Adrian M. Peter; Véronique Petit; Matt Knote

    We present the construction of a novel time-domain signature extraction methodology and the development of a supporting supervised pattern detection algorithm. We focus on the targeted identification of eclipsing binaries that demonstrate a feature known as the O’Connell effect. Our proposed methodology maps stellar variable observations to a new representation known as distribution fields (DFs). Given

    更新日期:2019-11-08
  • DESTINY: Database for the Effects of STellar encounters on dIsks and plaNetary sYstems
    Comput. Astrophys. Cosmol. Pub Date : 2019-09-09
    Asmita Bhandare; Susanne Pfalzner

    Most stars form as part of a stellar group. These young stars are mostly surrounded by a disk from which potentially a planetary system might form. Both, the disk and later on the planetary system, may be affected by the cluster environment due to close fly-bys. The here presented database can be used to determine the gravitational effect of such fly-bys on non-viscous disks and planetary systems.

    更新日期:2019-09-09
  • The IllustrisTNG simulations: public data release
    Comput. Astrophys. Cosmol. Pub Date : 2019-05-14
    Dylan Nelson; Volker Springel; Annalisa Pillepich; Vicente Rodriguez-Gomez; Paul Torrey; Shy Genel; Mark Vogelsberger; Ruediger Pakmor; Federico Marinacci; Rainer Weinberger; Luke Kelley; Mark Lovell; Benedikt Diemer; Lars Hernquist

    We present the full public release of all data from the TNG100 and TNG300 simulations of the IllustrisTNG project. IllustrisTNG is a suite of large volume, cosmological, gravo-magnetohydrodynamical simulations run with the moving-mesh code Arepo. TNG includes a comprehensive model for galaxy formation physics, and each TNG simulation self-consistently solves for the coupled evolution of dark matter

    更新日期:2019-05-14
  • CosmoGAN: creating high-fidelity weak lensing convergence maps using Generative Adversarial Networks
    Comput. Astrophys. Cosmol. Pub Date : 2019-05-06
    Mustafa Mustafa; Deborah Bard; Wahid Bhimji; Zarija Lukić; Rami Al-Rfou; Jan M. Kratochvil

    Inferring model parameters from experimental data is a grand challenge in many sciences, including cosmology. This often relies critically on high fidelity numerical simulations, which are prohibitively computationally expensive. The application of deep learning techniques to generative modeling is renewing interest in using high dimensional density estimators as computationally inexpensive emulators

    更新日期:2019-05-06
  • A new hybrid technique for modeling dense star clusters
    Comput. Astrophys. Cosmol. Pub Date : 2018-11-28
    Carl L. Rodriguez; Bharath Pattabiraman; Sourav Chatterjee; Alok Choudhary; Wei-keng Liao; Meagan Morscher; Frederic A. Rasio

    The “gravitational million-body problem,” to model the dynamical evolution of a self-gravitating, collisional N-body system with ∼106 particles over many relaxation times, remains a major challenge in computational astrophysics. Unfortunately, current techniques to model such systems suffer from severe limitations. A direct N-body simulation with more than 105 particles can require months or even years

    更新日期:2018-11-28
  • Fast cosmic web simulations with generative adversarial networks
    Comput. Astrophys. Cosmol. Pub Date : 2018-11-23
    Andres C. Rodríguez; Tomasz Kacprzak; Aurelien Lucchi; Adam Amara; Raphaël Sgier; Janis Fluri; Thomas Hofmann; Alexandre Réfrégier

    Dark matter in the universe evolves through gravity to form a complex network of halos, filaments, sheets and voids, that is known as the cosmic web. Computational models of the underlying physical processes, such as classical N-body simulations, are extremely resource intensive, as they track the action of gravity in an expanding universe using billions of particles as tracers of the cosmic matter

    更新日期:2018-11-23
  • Observing supermassive black holes in virtual reality
    Comput. Astrophys. Cosmol. Pub Date : 2018-11-19
    Jordy Davelaar; Thomas Bronzwaer; Daniel Kok; Ziri Younsi; Monika Mościbrodzka; Heino Falcke

    We present a 360∘ (i.e., 4π steradian) general-relativistic ray-tracing and radiative transfer calculations of accreting supermassive black holes. We perform state-of-the-art three-dimensional general-relativistic magnetohydrodynamical simulations using the BHAC code, subsequently post-processing this data with the radiative transfer code RAPTOR. All relativistic and general-relativistic effects, such

    更新日期:2018-11-19
  • On the parallelization of stellar evolution codes
    Comput. Astrophys. Cosmol. Pub Date : 2018-11-16
    David Martin; Jordi José; Richard Longland

    Multidimensional nucleosynthesis studies with hundreds of nuclei linked through thousands of nuclear processes are still computationally prohibitive. To date, most nucleosynthesis studies rely either on hydrostatic/hydrodynamic simulations in spherical symmetry, or on post-processing simulations using temperature and density versus time profiles directly linked to huge nuclear reaction networks. Parallel

    更新日期:2018-11-16
  • A MODEST review
    Comput. Astrophys. Cosmol. Pub Date : 2018-11-06
    Anna Lisa Varri; Maxwell Xu Cai; Francisca Concha-Ramírez; František Dinnbier; Nora Lützgendorf; Václav Pavlík; Sara Rastello; Antonio Sollima; Long Wang; Alice Zocchi

    We present an account of the state of the art in the fields explored by the research community invested in “Modeling and Observing DEnse STellar systems”. For this purpose, we take as a basis the activities of the MODEST-17 conference, which was held at Charles University, Prague, in September 2017. Reviewed topics include recent advances in fundamental stellar dynamics, numerical methods for the solution

    更新日期:2018-11-06
  • Entropy-limited hydrodynamics: a novel approach to relativistic hydrodynamics
    Comput. Astrophys. Cosmol. Pub Date : 2017-07-04
    Federico Guercilena; David Radice; Luciano Rezzolla

    We present entropy-limited hydrodynamics (ELH): a new approach for the computation of numerical fluxes arising in the discretization of hyperbolic equations in conservation form. ELH is based on the hybridisation of an unfiltered high-order scheme with the first-order Lax-Friedrichs method. The activation of the low-order part of the scheme is driven by a measure of the locally generated entropy inspired

    更新日期:2017-07-04
  • PKDGRAV3: beyond trillion particle cosmological simulations for the next era of galaxy surveys
    Comput. Astrophys. Cosmol. Pub Date : 2017-05-18
    Douglas Potter; Joachim Stadel; Romain Teyssier

    We report on the successful completion of a 2 trillion particle cosmological simulation to $z=0$ run on the Piz Daint supercomputer (CSCS, Switzerland), using 4000+ GPU nodes for a little less than 80 h of wall-clock time or 350,000 node hours. Using multiple benchmarks and performance measurements on the US Oak Ridge National Laboratory Titan supercomputer, we demonstrate that our code PKDGRAV3, delivers

    更新日期:2017-05-18
  • The black hole accretion code
    Comput. Astrophys. Cosmol. Pub Date : 2017-05-03
    Oliver Porth; Hector Olivares; Yosuke Mizuno; Ziri Younsi; Luciano Rezzolla; Monika Moscibrodzka; Heino Falcke; Michael Kramer

    We present the black hole accretion code (BHAC), a new multidimensional general-relativistic magnetohydrodynamics module for the MPI-AMRVAC framework. BHAC has been designed to solve the equations of ideal general-relativistic magnetohydrodynamics in arbitrary spacetimes and exploits adaptive mesh refinement techniques with an efficient block-based approach. Several spacetimes have already been implemented

    更新日期:2017-05-03
  • The evolution of hierarchical triple star-systems
    Comput. Astrophys. Cosmol. Pub Date : 2016-12-23
    Silvia Toonen; Adrian Hamers; Simon Portegies Zwart

    Field stars are frequently formed in pairs, and many of these binaries are part of triples or even higher-order systems. Even though, the principles of single stellar evolution and binary evolution, have been accepted for a long time, the long-term evolution of stellar triples is poorly understood. The presence of a third star in an orbit around a binary system can significantly alter the evolution

    更新日期:2016-12-23
  • Riemann solvers and Alfven waves in black hole magnetospheres.
    Comput. Astrophys. Cosmol. Pub Date : 2016-09-13
    Brian Punsly,Dinshaw Balsara,Jinho Kim,Sudip Garain

    In the magnetosphere of a rotating black hole, an inner Alfven critical surface (IACS) must be crossed by inflowing plasma. Inside the IACS, Alfven waves are inward directed toward the black hole. The majority of the proper volume of the active region of spacetime (the ergosphere) is inside of the IACS. The charge and the totally transverse momentum flux (the momentum flux transverse to both the wave

    更新日期:2016-09-13
  • In situ and in-transit analysis of cosmological simulations.
    Comput. Astrophys. Cosmol. Pub Date : 2016-08-24
    Brian Friesen,Ann Almgren,Zarija Lukić,Gunther Weber,Dmitriy Morozov,Vincent Beckner,Marcus Day

    Modern cosmological simulations have reached the trillion-element scale, rendering data storage and subsequent analysis formidable tasks. To address this circumstance, we present a new MPI-parallel approach for analysis of simulation data while the simulation runs, as an alternative to the traditional workflow consisting of periodically saving large data sets to disk for subsequent ‘offline’ analysis

    更新日期:2016-08-24
  • Achieving convergence in galaxy formation models by augmenting N-body merger trees
    Comput. Astrophys. Cosmol. Pub Date : 2016-08-22
    Andrew J Benson; Chris Cannella; Shaun Cole

    Accurate modeling of galaxy formation in a hierarchical, cold dark matter universe requires the use of sufficiently high-resolution merger trees to obtain convergence in the predicted properties of galaxies. When semi-analytic galaxy formation models are applied to cosmological N-body simulation merger trees, it is often the case that those trees have insufficient resolution to give converged galaxy

    更新日期:2016-08-22
  • Simulations of stripped core-collapse supernovae in close binaries
    Comput. Astrophys. Cosmol. Pub Date : 2016-03-01
    Alex Rimoldi; Simon Portegies Zwart; Elena Maria Rossi

    We perform smoothed-particle hydrodynamical simulations of the explosion of a helium star in a close binary system, and study the effects of the explosion on the companion star as well as the effect of the presence of the companion on the supernova remnant. By simulating the mechanism of the supernova from just after core bounce until the remnant shell passes the stellar companion, we are able to separate

    更新日期:2016-03-01
  • Efficient conservative ADER schemes based on WENO reconstruction and space-time predictor in primitive variables.
    Comput. Astrophys. Cosmol. Pub Date : 2016-01-13
    Olindo Zanotti,Michael Dumbser

    We present a new version of conservative ADER-WENO finite volume schemes, in which both the high order spatial reconstruction as well as the time evolution of the reconstruction polynomials in the local space-time predictor stage are performed in primitive variables, rather than in conserved ones. To obtain a conservative method, the underlying finite volume scheme is still written in terms of the

    更新日期:2016-01-13
  • Stationary relativistic jets.
    Comput. Astrophys. Cosmol. Pub Date : 2015-11-05
    Serguei S Komissarov,Oliver Porth,Maxim Lyutikov

    In this paper we describe a simple numerical approach which allows to study the structure of steady-state axisymmetric relativistic jets using one-dimensional time-dependent simulations. It is based on the fact that for narrow jets with $v_{z}\approx c$ the steady-state equations of relativistic magnetohydrodynamics can be accurately approximated by the one-dimensional time-dependent equations after

    更新日期:2015-11-05
  • Sapporo2: a versatile direct N-body library
    Comput. Astrophys. Cosmol. Pub Date : 2015-10-15
    Jeroen Bédorf; Evghenii Gaburov; Simon Portegies Zwart

    Astrophysical direct N-body methods have been one of the first production algorithms to be implemented using NVIDIA’s CUDA architecture. Now, almost seven years later, the GPU is the most used accelerator device in astronomy for simulating stellar systems. In this paper we present the implementation of the Sapporo2 N-body library, which allows researchers to use the GPU for N-body simulations with

    更新日期:2015-10-15
  • Implicit large eddy simulations of anisotropic weakly compressible turbulence with application to core-collapse supernovae
    Comput. Astrophys. Cosmol. Pub Date : 2015-08-21
    David Radice; Sean M Couch; Christian D Ott

    In the implicit large eddy simulation (ILES) paradigm, the dissipative nature of high-resolution shock-capturing schemes is exploited to provide an implicit model of turbulence. The ILES approach has been applied to different contexts, with varying degrees of success. It is the de-facto standard in many astrophysical simulations and in particular in studies of core-collapse supernovae (CCSN). Recent

    更新日期:2015-08-21
  • GPU-enabled particle-particle particle-tree scheme for simulating dense stellar cluster system
    Comput. Astrophys. Cosmol. Pub Date : 2015-07-03
    Masaki Iwasawa; Simon Portegies Zwart; Junichiro Makino

    We describe the implementation and performance of the $\mathrm {P}^{3}\mathrm{T}$ (Particle-Particle Particle-Tree) scheme for simulating dense stellar systems. In $\mathrm{P}^{3}\mathrm{T}$ , the force experienced by a particle is split into short-range and long-range contributions. Short-range forces are evaluated by direct summation and integrated with the fourth order Hermite predictor-corrector

    更新日期:2015-07-03
  • PHEW: a parallel segmentation algorithm for three-dimensional AMR datasets
    Comput. Astrophys. Cosmol. Pub Date : 2015-06-09
    Andreas Bleuler; Romain Teyssier; Sébastien Carassou; Davide Martizzi

    We introduce phew (Parallel HiErarchical Watershed), a new segmentation algorithm to detect structures in astrophysical fluid simulations, and its implementation into the adaptive mesh refinement (AMR) code ramses. phew works on the density field defined on the adaptive mesh, and can thus be used on the gas density or the dark matter density after a projection of the particles onto the grid. The algorithm

    更新日期:2015-06-09
  • A calculator for Roche lobe properties
    Comput. Astrophys. Cosmol. Pub Date : 2015-05-06
    Denis A Leahy; Janet C Leahy

    The Roche lobe geometry is important to understand and study the properties of the mass-losing component in a semi-detached binary system. However it is not easy to calculate accurately, and existing tables usually do not include the parameters of the binary system under study, nor do they allow for non-synchronous rotation. A calculator for properties of the Roche lobe is presented in two formats

    更新日期:2015-05-06
  • The numerical frontier of the high-redshift Universe
    Comput. Astrophys. Cosmol. Pub Date : 2015-03-28
    Thomas H Greif

    The first stars are believed to have formed a few hundred million years after the big bang in so-called dark matter minihalos with masses $\sim 10^{6}\mbox{ M}_{\odot}$ . Their radiation lit up the Universe for the first time, and the supernova explosions that ended their brief lives enriched the intergalactic medium with the first heavy elements. Influenced by their feedback, the first galaxies assembled

    更新日期:2015-03-28
  • Adaptive techniques for clustered N-body cosmological simulations
    Comput. Astrophys. Cosmol. Pub Date : 2015-03-28
    Harshitha Menon; Lukasz Wesolowski; Gengbin Zheng; Pritish Jetley; Laxmikant Kale; Thomas Quinn; Fabio Governato

    ChaNGa is an N-body cosmology simulation application implemented using Charm++. In this paper, we present the parallel design of ChaNGa and address many challenges arising due to the high dynamic ranges of clustered datasets. We propose optimizations based on adaptive techniques. We evaluate the performance of ChaNGa on highly clustered datasets: a $z \sim0$ snapshot of a 2 billion particle realization

    更新日期:2015-03-28
  • On the reliability of N-body simulations
    Comput. Astrophys. Cosmol. Pub Date : 2015-03-28
    Tjarda Boekholt; Simon Portegies Zwart

    The 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. In order to make this possible, we wrote an N-body code called

    更新日期:2015-03-28
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