Black holes bend light the wrong way

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Discussion Overview

The discussion revolves around the concept of negative refraction in the context of black holes, particularly how rotating black holes may bend light away from themselves under specific conditions. Participants explore the implications of this phenomenon on previous astronomical observations and the scientific method used to study it.

Discussion Character

  • Exploratory
  • Debate/contested
  • Technical explanation

Main Points Raised

  • Some participants mention that rotating black holes can bend light away from themselves, which may contradict previous understandings of light behavior near black holes.
  • There is skepticism regarding the relevance of negative refraction in astronomical contexts, with some arguing that its influence may be limited to small regions of strong gravitational fields.
  • Concerns are raised about the scientific method used in the research, suggesting that the approach may be flawed or backwards.
  • Participants express difficulty in finding additional information on negative refraction, indicating a lack of accessible resources on the topic.
  • One participant shares a resource for searching recent papers, indicating a collaborative effort to find more information.
  • There is a request for visual representations to clarify the concept of light bending in different directions around black holes.

Areas of Agreement / Disagreement

Participants express a mix of skepticism and curiosity regarding the implications of negative refraction in black holes. There is no consensus on the significance or relevance of the phenomenon, and multiple competing views remain regarding its impact on observations and the scientific method employed.

Contextual Notes

Participants note that the phenomenon may be confined to the event horizon of rotating black holes, which raises questions about its practical implications and relevance to broader astronomical observations.

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I read it but I am an amature, can U explain it in 100 words please.
 
It doesn't really explain what happens, it merely comments on the effect: under very specific circumstances rotating black holes can bend light away from themselves, instead of towards themselves.

They then go on to suggest that this is messing up all our previous observations.



But personally, I think they've got the scientific method backwards, at least the way the article is laid out.


"...researchers showed that certain artificial materials bend light in the opposite direction..."

"...prompted a flurry of research ... understanding and developing negative refracting materials..."

"...demonstrated that negative refraction could occur in a vacuum ... identified something that meets these requirements: a rotating black hole..."

They've encountered the phenomenon in materials, they look for other places where the phenomenon mgiht happen. It could happen here, so it must.


And is further weakened by its usefullness:

"some researchers question how much influence the effect will have in practice. ... in doubt as to the astronomical relevance ... the effect will be limited to small regions of space, as it can only occur in regions where the gravitational field is extremely strong.
 
I have googled the net but i can not find anything related to
negative refraction, maybe i am not looking in the right places
but the author of this paper is not very forthcoming.
 
wolram said:
I have googled the net but i can not find anything related to
negative refraction, maybe i am not looking in the right places
but the author of this paper is not very forthcoming.
One way to search for recent papers is to use citebase search - here:

http://citebase.eprints.org/cgi-bin/search

I keep that bookmarked in my browser. Just punch in the author(s) name and have the search sorted by date. That yielded this paper:

http://citebase.eprints.org/cgi-bin/citations?id=oai%3AarXiv%2Eorg%3Aastro%2Dph%2F0501522

You can also search by title, keyword, etc, and sort the results in all kinds of useful ways.
 
Last edited by a moderator:
Thanks for the tip Turbo
Im not sure if this anomaly has any relevance, even if it exists,
being confined to the event horizon of a rotating BH, it may screw
up some observations if anything.
 
Are there any images that show what is the right way and what is the wrong way Please ?
 

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