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IndustriaL
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Hi. Can Quantum Mechanics explain what happens at the singularity of a black hole? If so, how?
IndustriaL said:Hi. Can Quantum Mechanics explain what happens at the singularity of a black hole? If so, how?
wangyi said:To combine QM and GR is a job that not completed until now. But we have got many insteresting results, as far as i know. i don't know the singularity you mentioned is the coordinate singularity,
Terra Incognita said:I have a problem to understand how one can mix GR with QM results in order to make reasonable predictions (and not simply guesses that no one is able to falsify with an experiment).
In GR, an infinitesimal distance is to be compared with normal GR objects (i.e. size of objects, a planet, a star, a galaxy > 1km => 1m is a very small distance) while in quantum it is to be compared, for example, with the size of electrons and protons (~10^-15m => 10^-18m is already an infinitesimal distance).
An infinitesimal object in GR could be a very huge object in QM (up to 10^18 times!).
Therefore, how can we compare a black hole real size of GR (a size that could be in the meter range, an approximated infinitesimal small size in a GR toy model) with the sizes involved in QM (10^18 m) in order to make reasonable deductions on the QM vs GR effects?
TI.
werty said:Actually black holes have size, they all have the size r=2GM (geometric units) as previously mentioned. Thats the event horizon radius.
werty said:Actually black holes have size, they all have the size r=2GM (geometric units) as previously mentioned. Thats the event horizon radius.
werty said:haha I wouldn't say GR is a toy model, if it is then QM is a toy model aswell. We only have toy models!
werty said:Actually GR is well defined inside the event horizon and with a coordinate change you can calculate everything that would happen to you on your way from infinity to the singularity. Ofcourse you would never reach the singularity.
Terra Incognita said:Oh world, it seems to be difficult to be understood in this planet (I have a difficult post in the thread decoherence: surely the dark side of the force).
Tell me, what are the results (of concrete experiments) we have concerning the toy model verification of a black hole? (the size of the singularity: a point or sphere of 1km? => this has a direct inpact on QM results and not on the main GR results)
Have you fired particles on a black hole to verify that the interaction is closed to what this simple model says (the uncertainty on the size).
vanesch said:Luke, come to me ! We will do grand things together...
vanesch said:2) "try to do something". You can say: let us see where our current theories take us theoretically, even if it is in areas that have never been explored experimentally, and try to do things with that. The results of these trials are of course, as such, highly speculative. As much as I dislike people talking about things like Hawking radiation as if it were a fact of life without putting up a caveat that these are results that come from a mixture of known theories, used beyond their tested realm, mixed with some educated guesswork and speculation, as much I think that this is a courageous thing to do. Now, as long as out of that speculative work only comes predictions of experiments we can never do, I think it doesn't serve a big purpose. But you can never know that some verifiable experimental predictions CAN come out of it.
werty said:Have you taken any course in GR ? not just read popular litterature concerning it that is.
werty said:theres a link to the gravity experiment on the bottom of the previously linked paper
Quantum mechanics is the branch of physics that studies the behavior of particles at the atomic and subatomic level. It is based on the principle that particles can exist in multiple states at the same time, and their behavior is described by probabilities rather than definite outcomes.
A singularity is a point in space where the gravitational pull becomes infinitely strong, and the laws of physics as we know them break down. In the context of black holes, the singularity is located at the center of the black hole and is surrounded by the event horizon.
Quantum mechanics plays a crucial role in understanding the behavior of matter and energy at the event horizon and inside a black hole. It helps scientists explain how particles and energy behave near the singularity and how they can escape or be trapped by the black hole.
Currently, we do not have the technology or means to observe quantum effects at the event horizon or inside a black hole's singularity. However, some theories suggest that these effects may have observable consequences on the behavior of black holes, such as Hawking radiation.
Some theories propose that quantum mechanics and general relativity need to be unified to fully understand the behavior of black holes and their singularities. Others suggest that singularities may not actually exist and that quantum effects may prevent the formation of singularities. There is ongoing research and debate in the scientific community about the relationship between these two fields.