I Barrow black holes with fractal surface?

[sbrothy]

TL;DR Summary

More "hair" (fractal surface) ascribed to black holes. How serious is the professional community looking at this?

This should maybe go in the Beyond The Standard Model forum but since it's a paper about quantum cosmology I'll put it here. Feel free to move it if it's too speculative but that's exactly my question. That is: if it is...

Perusing

"The Area of a Rough Black Hole"
- - https://arxiv.org/abs/2004.09444)

It would seem that yet more "hair" is now being ascribed to black holes. This time fractal surface. It wouldn't really surprise me if black holes surfaces are indeed fractal. After all, most, if not all, natural objects are. Examples are legion. In the paper they mention the skin of an elephant but the list goes on an on. Just consider pepples, beaches, mountains, plants, etc. If this picture is correct it must have implications for Hawking radiation, which is in fact mentioned, I think. More virtual particles should logically escape if the surface is bigger.

This picture makes sense to me. At least intuitively, which I know is a bad way of judging these things. Quantum Mechanics being a case in point! But then again, happy amatoer and all. At least my (perhaps rather naive questions) are at least founded in actual papers.)

How seriously is this idea taken by the professional physics community? There are more papers deling with this, although they may not be pertainig to black holes specifically. As I'm just an interested amatoer I may not be able to judge their relevance.

"Observational Constraints of Barrow Holographic Dark Energy"
- - https://arxiv.org/abs/2005.10302
"Barrow Holographic Dark Energy"
- - https://arxiv.org/abs/2005.04115

 

[PeterDonis]

This should maybe go in the Beyond The Standard Model forum

Yes, moved. This is a speculative hypothesis, and AFAIK has not gotten any traction.

 

[Fractal matter]

There is a related article:
Turbulent black holes grow fractal skins as they feed

https://www.newscientist.com/article/dn25472-turbulent-black-holes-grow-fractal-skins-as-they-feed/

 

[PeterDonis]

Turbulent black holes grow fractal skins as they feed

Even more speculative: this isn't based on actual astronomical observations, it's based on a numerical simulation, and what they call "black holes" are actually "black branes" in AdS5.

 

[sbrothy]

There is a related article:
Turbulent black holes grow fractal skins as they feed

https://www.newscientist.com/article/dn25472-turbulent-black-holes-grow-fractal-skins-as-they-feed/

Funny though. I'm quite prepared for this thread to be closed. Too speculative by far. I'm a fan of fractals though as it seems this latest responder is too.

No, no need to close it. We'll just let it die quietly here. :)

 

[256bits]

It would seem that yet more "hair" is now being ascribed to black holes. This time fractal surface.

They are just doing a mathematical toy model, ascribing a what if ... , so in that sense the article is interesting.

How seriously is this idea taken by the professional physics community?

In regards to quantum foam proposed by Wheeler, and discussed by others, and quantum gravity.
See, if you are interested, and something you can explore further.
https://chandra.si.edu/blog/node/558
The results show that space-time is smooth down to 1000 times smaller than the nucleus of a hydrogen atom (as an upper limit ).

The Great and the Small: Is Quantum Foam Losing its Fizz? | ChandraBlog | Fresh Chandra News
This was the effect that we wanted to search for, which previous papers had not described properly. We modeled these effects, and then used observations of distant quasars by the Chandra X-ray Observatory, Fermi Gamma-ray Space Telescope, and the Very Energetic Radiation Imaging Telescope Array System, known as VERITAS, to look at archival images of the most distant quasars. We wanted to look in the X-rays and gamma-rays because of their short wavelength – allowing us to possibly observe the smallest possible distortions in the wavefronts by quantum gravity. But even the most distant quasars (see examples, below) appear to form sharp X-ray and gamma-ray images. Two models of quantum foam had predicted that these images would disappear at short wavelengths. Chandra’s X-ray images rules out one model, according to which photons diffuse randomly through space-time foam in a manner similar to light diffusing through fog. And gamma-ray images with Fermi and VERITAS, demonstrate that a so-called holographic model with less diffusion does not work

https://chandra.si.edu/press/15_releases/press_052815.html