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Black holes themselves cannot emit light (Hawking radiation is a separate topic). Gas that is in accretion disks around a black hole can become hot and produce

by cyphar 9y ago

Black holes themselves cannot emit light (Hawking radiation is a separate topic). Gas that is in accretion disks around a black hole can become hot and produce light, but that process has nothing to do with the black hole itself. By definition, light cannot escape a black hole so processes inside the black hole do not emit light (or rather, if they do we cannot see it). However, massive bodies experiencing rapid acceleration emit gravitational waves. This is something that happens due to a black hole's mass and not it's event horizon properties (in principle you can also detect neutron star interactions). But this is emitted due to the motion of the objects themselves, not from accretion disks (which may not be present for some black holes). So the event itself does not produce light.

oldandtired 9y ago
A problem with your explanation is that from our perspective (which is the only one that actually matters here), "black holes" will never undergo rapid acceleration due to the extreme time dilation effects according to the gravity model used. I find it interesting that much ado is made about "black holes" existing when by the theory by which they are proposed, they cannot exist in our finite universe. The time dilation effects, which is a part of the theory, will not allow any such theoretical entity to be formed in our finite time universe. With that said, the observations of LIGO do not confirm the existence of such entities as "black holes". What these observation do do is indicate that there is something happening. We just don't know yet what this is. Going down the rabbit hole of sticking to the "black hole" model only engenders ignorance. These are interesting experiments and results and it behooves an open mind to try to further our understanding of what is causing these observational event. Unfortunately, the "dogma" of worshipping Einstein and his "holy works" only locks us into a position of not furthering our understanding. Note: I have used "worshipping" and "holy works" specifically because of the attitudes of those who will not countenance any different views from Generally Relativity et al. Whether or not, GR and SR have long term merit is still a question being pursued. Some variation of these may be more suitable. But that doesn't mean that GR and SR are correct (as is the usual defence given). The last couple of decades have been an interesting case study in terms of an unwitting increase in dogmatic push for specific theories and models in quite a few areas. When it boils down to it, these theories and models are subject to change and even throwing them out for different and better models. To get emotionally caught up in defending a specific theory and model as the "Truth" does not put science in a good light for the general populous. I have said it elsewhere, science is about the discovery of the universe around us and finding applicable theories and models that are useful for our understanding. If you want "Truth" then go and study philosophy and religion. Every theory you want to follow needs to have a good defence, but not to the extent of getting so emotionally caught up in it that you ignore discrepancies and results that disagree with your preferred theory and model. How often has the "Truth" that the general science community has promulgated been overturned? We need to be careful not to get so entrenched in a specific viewpoint that we cannot see the merit in other theories or models. It is history that tells us to be careful here.
gus_massa 9y ago
If you have two charged black holes, orbiting closer until they collide, then they must emit electromagnetic radiation. I'm not sure how high is the frequency of the orbits just before the collision and how much energy they can dissipate in this way, but it's definitively not 0. Also, he Hawking radiation is an intrinsic property of the black holes, you can't disconnect it. I doubt that anyone has calculated if the Hawking radiation increase or decrease during a black hole - black hole collision. My guess is that it increase and if you are nearby you would see a flash of light. The technical detail that the light doesn't come from inside the black holes is not meaningful. The whole black hole - black hole collision also includes all the Hawking-like radiation emitted.

by cyphar 9y ago

oldandtired 9y ago

A problem with your explanation is that from our perspective (which is the only one that actually matters here), "black holes" will never undergo rapid acceleration due to the extreme time dilation effects according to the gravity model used. I find it interesting that much ado is made about "black holes" existing when by the theory by which they are proposed, they cannot exist in our finite universe. The time dilation effects, which is a part of the theory, will not allow any such theoretical entity to be formed in our finite time universe. With that said, the observations of LIGO do not confirm the existence of such entities as "black holes". What these observation do do is indicate that there is something happening. We just don't know yet what this is. Going down the rabbit hole of sticking to the "black hole" model only engenders ignorance. These are interesting experiments and results and it behooves an open mind to try to further our understanding of what is causing these observational event. Unfortunately, the "dogma" of worshipping Einstein and his "holy works" only locks us into a position of not furthering our understanding. Note: I have used "worshipping" and "holy works" specifically because of the attitudes of those who will not countenance any different views from Generally Relativity et al. Whether or not, GR and SR have long term merit is still a question being pursued. Some variation of these may be more suitable. But that doesn't mean that GR and SR are correct (as is the usual defence given). The last couple of decades have been an interesting case study in terms of an unwitting increase in dogmatic push for specific theories and models in quite a few areas. When it boils down to it, these theories and models are subject to change and even throwing them out for different and better models. To get emotionally caught up in defending a specific theory and model as the "Truth" does not put science in a good light for the general populous. I have said it elsewhere, science is about the discovery of the universe around us and finding applicable theories and models that are useful for our understanding. If you want "Truth" then go and study philosophy and religion. Every theory you want to follow needs to have a good defence, but not to the extent of getting so emotionally caught up in it that you ignore discrepancies and results that disagree with your preferred theory and model. How often has the "Truth" that the general science community has promulgated been overturned? We need to be careful not to get so entrenched in a specific viewpoint that we cannot see the merit in other theories or models. It is history that tells us to be careful here.

gus_massa 9y ago

If you have two charged black holes, orbiting closer until they collide, then they must emit electromagnetic radiation. I'm not sure how high is the frequency of the orbits just before the collision and how much energy they can dissipate in this way, but it's definitively not 0. Also, he Hawking radiation is an intrinsic property of the black holes, you can't disconnect it. I doubt that anyone has calculated if the Hawking radiation increase or decrease during a black hole - black hole collision. My guess is that it increase and if you are nearby you would see a flash of light. The technical detail that the light doesn't come from inside the black holes is not meaningful. The whole black hole - black hole collision also includes all the Hawking-like radiation emitted.