标题： 非局部引力中螺旋星系的演化 显示英文标题

标题： Evolution of spiral galaxies in nonlocal gravity

摘要： 我们研究了在非局域引力理论背景下模拟盘星系的演化。在这个理论中，宇宙学和天体物理学中暗物质问题的出现是引力相互作用非局域性的体现。利用高分辨率N体模拟，我们研究了盘星系的动力学演化，并将其结果与标准暗物质观点进行了比较。具体来说，我们构建了两个指数型星系模型，一个处于非局域引力（NLG）中，另一个被Plummer型暗物质晕包围。这两个系统都从相同的重子物质分布、粒子速度、随机速度以及初始Toomre参数开始。然而，尽管两种模型的初始条件相同，但它们的长期动力学表现出一些显著差异。例如，结果表明NLG模型中的棒旋不稳定现象发生得更快。另一方面，在模拟结束时，我们发现NLG中的棒比标准情况更弱且更快。 显示英文摘要

摘要： We study the evolution of simulated disk galaxies in the context of a nonlocal theory of gravity. In this theory the appearance of the dark matter problem in cosmology and astrophysics is a manifestation of the nonlocality of the gravitational interaction. Using high-resolution N-body simulations, we investigate the dynamical evolution of disk galaxies and compare the result with the standard dark matter viewpoint. Specifically, we construct two exponential galaxy models, one in nonlocal gravity (NLG) and the other surrounded by a Plummer dark matter halo. Both systems start from the same baryonic matter distribution, particles velocities, random velocities and the initial Toomre's parameter. However, although the initial conditions are the same in both models, their long-term dynamics reveals some notable differences. For example, it turns out that the bar instability happens with higher rate in NLG model compared with the standard case. On the other hand, at the end of the simulation, we find that bars are weaker and faster in NLG compared with the standard case.