Yi-Bo Liang | Searcharxiv

arXiv2026

Asymptotic Throat: The Geometric Inevitability of Regular Black Holes

We reveal that a fundamental minimal length naturally replaces the Schwarzschild singularity with future infinity, formalizing the ``asymptotic throat'' as a geometric inevitability. This scheme avoids the topology changes, multiple horizons, and universe towers characteristic of existing regular black hole models. We establish a general regularization framework, construct explicit examples with their physical sources, and show that the surface gravity and Hawking temperature remain unaltered. The asymptotic throat thus provides a pristine classical bedrock for future quantum gravity investigations.

gr-qc↗

arXiv2023

Rationalizing Unphysical Radiation in the Unruh Effect by Extending Black Hole Spacetime

We demonstrate that Schwarzschild spacetime has a conformal extension and that, beyond null infinity, there is a black hole with a timelike singularity. In conformal extended spacetime, every null infinity is a killing horizon with vanishing surface gravity. When a quantized massless scalar field is taken into this spacetime and different vacuums for the field are defined, thermal radiation coming from the extended black hole could be observed. This makes sense, much like the thermal radiation coming from the white hole. The Unruh effect is therefore plausible in conformal extended Schwarzschild spacetime. It is shown that the thermal radiation coming from past null infinity in Schwarzschild spacetime, which is difficult to imagine as the result of any physical process, is the result of the reduction of the thermal radiation passing through past null infinity in conformal extended spacetime. We also present a conformal extension of Kerr spacetime for the first time. Then, by examining a quantized massless scalar field on this spacetime, we get the meaningful conclusion that there is thermal radiation coming from a different rotating black hole passing through past null infinity. Similarly, the result of the Kerr black hole is consistent with that of the Schwarzschild black hole.

gr-qc↗