C.Going keyword-searching around the net, I find very little that looks even slightly related. There's lots of papers talking about static patches, but then I come across this one:
https://iopscience.iop.org/article/10.1088/2399-6528/aab8e0
Just reading the first couple sentences of the abstract makes my brain yell GIGO! :
> Based on an observer-centric methodology, we pinpoint the basic origin of the
> spectral Planckianity of the asymptotic Hawking modes in the conventional
> treatments of the evaporating horizons. By considering an observer who analyzes
> a causal horizon in a generic spacetime, we first clarify how the asymptotic
> Planckian spectrum is imposed on the exponentially redshifted Hawking modes
> through a geometric dispersion mechanism developed by a semiclassical
> environment which is composed by all the modes that build up the curvature
> of the causal patch of the asymptotic observer.
Is that anything but jibberish? Because if not, I'm betting it was input to the model that generated the ... Paper Under Test π