标题： 流体/引力中的辐射和平坦极限 显示英文标题

标题： Radiation in Fluid/Gravity and the Flat Limit

摘要： 我们探讨了表现出辐射行为的渐近局部反德西特时空，采用允许明确平直极限的空规范。 体内的辐射内容由超泊松向量捕获，我们以双边界理论中的流体变量重新解释这一概念。 对于代数特殊解，我们发现体内的辐射与边界应力张量中的耗散修正之间存在紧密联系，展示了辐射与边界流体中熵产生的直接联系。 这揭示了体内辐射动力学与边界非平衡共形物理之间的丰富相互作用。 随后，我们在平空间全息理论的背景下研究这种对应关系的平直极限。 在此背景下，我们构建了超泊松向量的卡罗尔类似物，并引入了如能量探测器等天体观测量，这些观测量自然地从体内的辐射结构中出现。 我们的分析表明，体内的辐射源激发了卡罗尔粘性应力张量和热流，该张量在此框架中编码了邦迪新闻。 我们通过具体的例子说明了我们的结果，包括 罗宾逊-特劳特曼时空和加速黑洞。 显示英文摘要

摘要： We explore asymptotically locally anti-de Sitter spacetimes exhibiting radiative behavior, employing null gauges that allow for a well-defined flat limit. The radiative content in the bulk is captured by the super-Poynting vector, which we reinterpret holographically in terms of fluid variables in the dual boundary theory. For algebraically special solutions, we uncover a close connection between bulk radiation and dissipative corrections in the boundary stress tensor, demonstrating a direct link between radiation and entropy production in the boundary fluid. This reveals a rich interplay between radiative dynamics in the bulk and out-of-equilibrium conformal physics at the boundary. We then investigate the flat limit of this correspondence in the context of flat-space holography. In this setting, we construct a Carrollian analogue of the super-Poynting vector and introduce Celestial observables, such as energy detectors, which emerge naturally from the bulk's radiative structure. Our analysis shows that bulk radiation sources the Carrollian viscous stress tensor and heat current, which encodes the Bondi news in this framework. We illustrate our results with explicit examples, including Robinson-Trautman spacetimes and accelerating black holes.