ngravs: Distinct gravitational interactions in gadget-2

This program has been imported from the CPC Program Library held at Queen's University Belfast (1969-2018) Abstract We discuss an extension of the massively parallel cosmological simulation code gadget-2, which now enables investigation of multiple and distinct gravitational force laws, provided they are dominated by a constant scaling of the Newtonian force. In addition to simplifying investigations of a universally modified force law, the ngravs extension provides a foundation for state-of-the-art collisionless cosmological simulations of exotic gravitational scenarios. We briefly review the algorithms u... Title of program: Gadget-2.0.7-ngravs Catalogue Id: AFAV_v1_0 Nature of problem N-body cosmological codes are traditionally designed to investigate a single gravitating species interacting via the Newtonian force law. There exist viable extensions to General Relativity [1], however, which predict weakfield, slow-motion limits featuring distinct gravitational force laws between distinct particle species. To enable investigation and constraint of these theories with available astrophysical data, a necessary first step is to extend an N-body simulator to handle distinct gravit ... Versions of this program held in the CPC repository in Mendeley Data AFAV_v1_0; Gadget-2.0.7-ngravs; 10.1016/j.cpc.2016.06.018本程序源自贝尔法斯特女王大学馆藏的CPC程序库（1969-2018） 摘要 本文讨论了大规模并行宇宙学模拟程序Gadget-2（gadget-2）的扩展版本，该扩展现已支持对多种不同引力定律的研究，前提是这些引力定律均可通过牛顿引力的常数缩放来表征。除了简化对全域修正引力定律的研究外，ngravs扩展还为当前顶尖的奇异引力场景无碰撞宇宙学模拟提供了基础。我们将简要回顾相关算法…… 程序名称：Gadget-2.0.7-ngravs 目录编号：AFAV_v1_0 问题本质 传统N体（N-body）宇宙学程序的设计初衷是研究仅通过牛顿引力定律相互作用的单类引力作用粒子。然而，目前已存在若干可行的广义相对论（General Relativity）扩展理论，这些理论预言了弱场、慢运动极限下不同粒子种类间存在各异的引力定律。为了利用现有天体物理数据对这些理论开展研究并施加约束，首要的必要步骤是对N体模拟器进行扩展，使其能够处理不同的引力…… 存放在Mendeley数据集中CPC库内的本程序版本：AFAV_v1_0；Gadget-2.0.7-ngravs；10.1016/j.cpc.2016.06.018