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You are correct that we just dont know what happens behind event horizont, from our perspective at least. Currently our best theory says nothing from inside can

You are correct that we just dont know what happens behind event horizont, from our perspective at least. Currently our best theory says nothing from inside can leak out, so in that spirit saying infalling matter ends up in singularity is as based in reality as it transforming into unicorns. Regardless, its important to keep in mind that this is valid _only_ from our perspective, that from the perspective of infalling matter something _real_ happens, and that real thing that happens is probably not completely disconnected from rules we perceived in our own universe. Throwing hands up and saying "we cant tell whats inside, so why are we even arguing about what we think happens there" is certainly a way to look at things if your only motivation is to find out whats happening inside, but that is not all we are after. We are trying to use all we currently know to reason about how the inside might look, any possibility, and try to work out backwards what unforseen implications it might have for our reality. We are not saying that inside blackhole is sigularity, we are saying that, given our understanding of how outside looks, there might be a singularity inside. We also know the math that yields us this singularity is probably wrong (infinite), and actively are trying to figure out whats wrong with it. We are using this imaginated realoty to work backwards what we might have gotten wrong, and perhaps in this case its not even the roght way of thinking to solve this mystery; it just worked for us before, so we trying. If you figure out whats actually happening there, and find some way to connect it to rules of our universe, everyone will cheer. If its by first discovering new effect in our universe that would elegantly fit into blackholes, or in the stroke of genius come up with a pure theory enlighting some real observations, nobody would care. Its just when we throw a mass, it keeps going. It makes more sense to think that it goes the same inside blackhole, but maybe not. We just dont know..

Jensson 2y ago
> Its just when we throw a mass, it keeps going You wouldn't feel going through the event horizon of a large black hole, so I see no reason why that mass would somehow just collapse into a singularity. Also the math for a black hole states that when the black holes density reaches below the density of the universe, the black holes event horizon will expand and encompass the whole universe, meaning matter doesn't even have to fall into the black hole, the black hole could just grow into the matter and then you don't even have a velocity you just have matter entering the black hole. We know the two above are how the math for black holes work, none of those produce likely singularities, because there is no force compressing that into a singularity. So if singularities exists in black holes, it would just be some of them, and not all parts of the black hole would have to be a part of that singularity.
- MaxikCZ 2y ago
  I am not arguing for certainty of singularity, quite the opposite. I stated that we seriously suspect the math yielding us that singularity is wrong, we just cant figure out anything more correct yet. Personally I think the geometry of spacetime inside blackhole gets all twisted up, bubbling like a boiling pot of water, but my guess is as good (probably worse) than anyone elses. >when blackhole density falls below the density of the universe Which one? The outside one? Density of whole universe? Its local surroundings? Are you counting unknown pressures of stuff we, for pure lack of understanding what the hell it even is, call dark energy/mass? The "blackhole less dense than the rest of the universe" seem like just another mathematical artefact that couldnt, for any reason, exist in real world. Not saying thinking about it is wrong, but imho more could be gained by thinking "well it surely cant exist, so what mechanism are there that stops this", instead of "this math says that, so lets subdue our whole theory to it". Very same scenario as the singularity inside. Just because math works for something doesnt mean it is like that. In science history we had plenty of equations that worked, until we discovered some edge case where it suddenly didnt. I think its safe to bet interiors of blackholes, or blackholes encompassing whole universe, are prime candidates for such edge cases where our pressumed math models just break down. The fact that our current math models are returning infinities, we are generally accepting that to be the case.
  - Jensson 2y ago
    > but imho more could be gained by thinking "well it surely cant exist, so what mechanism are there that stops this" Well, the universe Schwarzschild radius is massively larger than the universe itself, so math says we live in a black hole. It is true this might be a mathematical artifact, but it could also be how it actually works and the observations we make in our universe and about big bang is how a black hole looks on the inside. I don't think you should just assume the math is wrong here and throw away those observations of the inside of a black hole. Sure you should be open to that being wrong, but at least to me that is far more believable and interesting to study, then you can try to connect what we observed about the big bang with a black hole etc. If I go through enough of these forum discussions maybe I develop this long enough, and then maybe I'll take a serious attempt at solving the math to combine the two, since nobody else will do that. I was called a genius by both my physics and math professors, so it is possible I can solve it since I have good intuition for physics and good skills at math, most people who work in physics just have one of those, even though likely I'll fail, but it would be fun to try. What makes me believe such an attempt could work is that it could lead to a different math for gravity and black holes at small scales, and thus lead to a unified theory of QFT and GR. If I manage to do that then I could convince physicists to adopt the new interpretation of GR. Current attempts of unifying those two has started from the QFT side and tried to incorporate current GR theories, but they all failed. But I haven't seen many try to attempt that from the GR side and unify that with QFT, so maybe that would yield some results. Anyway, I don't think that professional physicists will solve this, since they are too occupied focusing on publishable results rather than solving the core issue. What I write here isn't publishable, so no physicists would even think about working on it. It is how GR was invented by Einstein even though he wasn't a physics researcher, sometimes you need a big jump done by an outsider. GR wasn't on anyone's radar when Einstein suggested it, likely it would never have been discovered without Einstein, or at least take centuries. The gravity formula you get from GR doesn't need space time distortions to reproduce, so theoretical physicists would just update the gravity formula to match observations without creating a new interpretation of what that means. Newtons gravity formula doesn't come with an interpretation, updating it to match new data is exactly what they did with dark matter and dark energy since it is just a formula, so I see no reason why gravity would be any different without Einstein's GR. Black holes would just be a part of that dark matter. Edit: Anyway, for me it is fun to argue on forums, so that is the best way for me to think and develop theories. Typically I don't really believe what I say, so part of my posts is to find evidence for it and try to convince myself that what I say is true. So I refine things quite a bit in every discussion.

Jensson 2y ago

> Its just when we throw a mass, it keeps going You wouldn't feel going through the event horizon of a large black hole, so I see no reason why that mass would somehow just collapse into a singularity. Also the math for a black hole states that when the black holes density reaches below the density of the universe, the black holes event horizon will expand and encompass the whole universe, meaning matter doesn't even have to fall into the black hole, the black hole could just grow into the matter and then you don't even have a velocity you just have matter entering the black hole. We know the two above are how the math for black holes work, none of those produce likely singularities, because there is no force compressing that into a singularity. So if singularities exists in black holes, it would just be some of them, and not all parts of the black hole would have to be a part of that singularity.

MaxikCZ 2y ago
I am not arguing for certainty of singularity, quite the opposite. I stated that we seriously suspect the math yielding us that singularity is wrong, we just cant figure out anything more correct yet. Personally I think the geometry of spacetime inside blackhole gets all twisted up, bubbling like a boiling pot of water, but my guess is as good (probably worse) than anyone elses. >when blackhole density falls below the density of the universe Which one? The outside one? Density of whole universe? Its local surroundings? Are you counting unknown pressures of stuff we, for pure lack of understanding what the hell it even is, call dark energy/mass? The "blackhole less dense than the rest of the universe" seem like just another mathematical artefact that couldnt, for any reason, exist in real world. Not saying thinking about it is wrong, but imho more could be gained by thinking "well it surely cant exist, so what mechanism are there that stops this", instead of "this math says that, so lets subdue our whole theory to it". Very same scenario as the singularity inside. Just because math works for something doesnt mean it is like that. In science history we had plenty of equations that worked, until we discovered some edge case where it suddenly didnt. I think its safe to bet interiors of blackholes, or blackholes encompassing whole universe, are prime candidates for such edge cases where our pressumed math models just break down. The fact that our current math models are returning infinities, we are generally accepting that to be the case.
- Jensson 2y ago
  > but imho more could be gained by thinking "well it surely cant exist, so what mechanism are there that stops this" Well, the universe Schwarzschild radius is massively larger than the universe itself, so math says we live in a black hole. It is true this might be a mathematical artifact, but it could also be how it actually works and the observations we make in our universe and about big bang is how a black hole looks on the inside. I don't think you should just assume the math is wrong here and throw away those observations of the inside of a black hole. Sure you should be open to that being wrong, but at least to me that is far more believable and interesting to study, then you can try to connect what we observed about the big bang with a black hole etc. If I go through enough of these forum discussions maybe I develop this long enough, and then maybe I'll take a serious attempt at solving the math to combine the two, since nobody else will do that. I was called a genius by both my physics and math professors, so it is possible I can solve it since I have good intuition for physics and good skills at math, most people who work in physics just have one of those, even though likely I'll fail, but it would be fun to try. What makes me believe such an attempt could work is that it could lead to a different math for gravity and black holes at small scales, and thus lead to a unified theory of QFT and GR. If I manage to do that then I could convince physicists to adopt the new interpretation of GR. Current attempts of unifying those two has started from the QFT side and tried to incorporate current GR theories, but they all failed. But I haven't seen many try to attempt that from the GR side and unify that with QFT, so maybe that would yield some results. Anyway, I don't think that professional physicists will solve this, since they are too occupied focusing on publishable results rather than solving the core issue. What I write here isn't publishable, so no physicists would even think about working on it. It is how GR was invented by Einstein even though he wasn't a physics researcher, sometimes you need a big jump done by an outsider. GR wasn't on anyone's radar when Einstein suggested it, likely it would never have been discovered without Einstein, or at least take centuries. The gravity formula you get from GR doesn't need space time distortions to reproduce, so theoretical physicists would just update the gravity formula to match observations without creating a new interpretation of what that means. Newtons gravity formula doesn't come with an interpretation, updating it to match new data is exactly what they did with dark matter and dark energy since it is just a formula, so I see no reason why gravity would be any different without Einstein's GR. Black holes would just be a part of that dark matter. Edit: Anyway, for me it is fun to argue on forums, so that is the best way for me to think and develop theories. Typically I don't really believe what I say, so part of my posts is to find evidence for it and try to convince myself that what I say is true. So I refine things quite a bit in every discussion.