带有辐射低效吸积流的膜世界黑洞图像
Images of Braneworld black holes with radiatively inefficient accretion flows
AI总结：
研究膜世界黑洞的潮汐参数对事件视界望远镜图像形态的影响，通过GRRT模拟发现参数变化导致非单调形态变化，且识别挑战性大。
摘要：
视界尺度成像作为探测时空几何的变革性工具，能够对强场区域的引力理论进行严格检验。膜世界中的Casadio-Fabbri-Mazzacurati(CFM)黑洞包含一个表征体几何潮汐效应的额外参数，使其对此任务极具价值。我们进行广义相对论辐射传输(GRRT)模拟，生成与事件视界望远镜对M87*观测一致的合成图像。我们发现潮汐参数在图像形态上留下非单调变化，强调了时空几何与吸积等离子体可观测辐射之间的复杂耦合。我们还使用归一化互相关系数和DSSIM指数分析图像比较度量，发现这些不匹配的量级约为10^3，这意味着即使未来使用ngEHT和BHEX观测，通过黑洞图像识别膜世界黑洞仍然具有挑战性。
英文摘要：
Horizon-scale imaging acts as a transformative tool for probing spacetime geometry, enabling stringent tests of gravitational theories in the strong-field regime. The Casadio-Fabbri-Mazzacurati(CFM) black hole in braneworld contains an extra parameter that characterizes the tidal effects from the bulk geometry, making it highly valuable for this task. We perform general relativistic radiative transfer (GRRT) simulations and generate synthetic images consistent with Event Horizon Telescope observations of M87*. We find that the tidal parameter imprints nonmonotonic changes on the image morphology, underscoring the intricate coupling between spacetime geometry and the observable radiation from the accreting plasma. We also analyze the image-comparison metric using normalized cross-correlation coefficients and the DSSIM index and find that the magnitudes of these mismatches are on the order of 10^3, which implies that identifying braneworld black holes through black hole images remains challenging even with future ngEHT and BHEX observations.
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