ngravs：GADGET-2中的独特引力相互作用
ngravs: Distinct gravitational interactions in GADGET-2
摘要：
我们讨论了大规模并行宇宙学模拟代码GADGET-2的扩展，该代码现在可以研究多种不同的引力定律，前提是它们受到牛顿力的恒定缩放的支配。除了简化对普遍修正的力定律的研究外，ngravs的扩展还为奇异引力场景的最先进的无碰撞宇宙学模拟提供了基础。我们简要回顾了GADGET-2所使用的算法，并提出了我们的扩展到多重引力，突出了额外的功能，便于考虑奇异力法。我们讨论了ngravs扩展的准确性和性能，包括内部和未更改的GADGET-2，在相关的操作模式。ngravs扩展是向研究社区公开发布的。
英文摘要：
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 used by GADGET-2, and present our extension to multiple gravities, highlighting additional features that facilitate consideration of exotic force laws. We discuss the accuracy and performance of the ngravs extension, both internally and with an unaltered GADGET-2, in the relevant operational modes. The ngravs extension is publicly released to the research community.
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