标题： 通过超弥散星系动力学测试非局部引力 显示英文标题

标题： Testing non-local gravity through Ultra-Diffuse Galaxies kinematics

摘要： 近年来，超弥散星系的出现对星系形成模型以及广义相对论的扩展理论构成了严峻的挑战。 在同一体系的天体物理对象中同时存在缺乏暗物质和暗物质主导的系统，确实要求引力模型足够灵活以描述非常不同的引力区域。 在这项工作中，我们研究了一种非局部广义相对论的扩展理论，由于其能够在不引入任何暗能量流体的情况下解释晚期宇宙加速膨胀，近年来引起了越来越多的关注。 我们利用了三个超弥散星系的动力学数据：NGC 1052-DF2 和 NGC 1052-DF4，它们缺乏暗物质，以及 Dragonfly 44，它表现出高度主导的暗物质成分。 我们的分析表明，牛顿势的非局部修正不会影响动力学预测，因此当非局部引力模型作为暗能量模型时，不会出现破坏效应。 我们还提供了在这些质量尺度下特征非局部半径可以达到的最小值。 显示英文摘要

摘要： The emergence of the Ultra-Diffuse Galaxies in recent years has posed a severe challenge to the galaxy formation models as well as the Extended Theories of Gravity. The existence of both dark matter lacking and dark matter dominated systems within the same family of astrophysical objects indeed requires the gravity models to be versatile enough to describe very different gravitational regimes. In this work, we study a non-local extension of the theory of General Relativity that has drawn increasing attention in recent years due to its capability to account for the late time cosmic acceleration without introducing any dark energy fluid. We leverage the kinematic data of three Ultra-Diffuse Galaxies: NGC 1052-DF2 and NGC 1052-DF4, which are dark matter lacking, and Dragonfly 44, which exhibits a highly dominant dark matter component. Our analysis shows that the non-local corrections to the Newtonian potential do not affect the kinematic predictions, hence no spoiling effects emerge when the Non-local Gravity model serves as a dark energy model. We additionally provide the minimum value that the characteristic non-local radii can reach at these mass scales.