We investigate the relation between quantum nonlocality and gravity at the astrophysical scale, both in the classical and quantum regimes. Considering a gedanken experiment involving particle pairs orbiting in the strong gravitational field of ultra-compact objects, we find that the violation of Bell inequality acquires an angular modulation factor that strongly depends on the nature of the gravitational source. We show how such gravitationally-induced modulation of quantum nonlocality readily discriminates between black holes (both classical and inclusive of quantum corrections) and string fuzzballs, i.e., the true quantum description of ultra-compact objects according to string theory. These findings promote Bell nonlocality as a potentially key tool in putting quantum gravity to the test.

中文翻译：

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引力调制量子关联：区分具有贝尔非局域性的超紧凑物体的经典模型和量子模型


我们在天体物理尺度上研究经典和量子体系中的量子非局域性和引力之间的关系。考虑到涉及在超紧凑物体的强引力场中运行的粒子对的 gedanken 实验，我们发现违反贝尔不等式获得了一个强烈依赖于引力源性质的角度调制因子。我们展示了这种引力引起的量子非定域性调制如何轻松地区分黑洞（经典黑洞和包含量子校正的黑洞）和弦模糊球，即根据弦理论对超紧凑物体的真实量子描述。这些发现促使贝尔非定域性成为测试量子引力的潜在关键工具。