准正规模作为我们宇宙中黑洞内部的外部探针

本文探讨了黑洞在反射腔体中受到线性扰动时的准正规模谱。研究表明，这些谱特征编码了黑洞内部及奇点的信息，并提出通过吸积等离子体作为反射镜，利用无线电波段的电磁波探测原初黑洞内部信息的观测方案。

arXiv:2608.13643v1 Announce Type: cross Abstract: We consider a scenario in which a black hole is enclosed in a reflecting timelike cavity and linearly perturbed. For the resulting quasinormal spectra of gravitational, electromagnetic, and other perturbations, in conjunction with our arXiv:2606.11297, we establish a thermal product formula and derive a universal asymptotic expression for high quasinormal overtones. Both results hold in asymptotically flat, de Sitter, and Anti-de Sitter spacetimes (known previously). This spectral signature directly encodes information about the black hole interior and its singularity, and is, at least in principle, accessible to an observer outside the event horizon. We then propose a concrete observational setup in which accreting plasma plays the role of a partially transmissive mirror. For small, hypothetical, primordial black holes, we argue that one may thereby be able to extract concrete information about the black hole interior from electromagnetic waves in the radiowave spectrum.