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Wikipedia's list of unsolved problems in physics [0] includes problems that aren't "no data we can't explain" and "we can't test it yet". They're more like "we

Wikipedia's list of unsolved problems in physics [0] includes problems that aren't "no data we can't explain" and "we can't test it yet". They're more like "we expect that the theory can explain observation X, but we don't know how yet" and "we don't know what the theory predicts for situation Y". For example: - Mechanism for baryon asymmetry - Mechanism for ultra high energy cosmic rays - Mechanism of high temp superconductors - Black hole information paradox - Finding solutions to the Schrodinger equation in various situations You might mean something very specific when you say "Fundamental physics" though. 0: https://en.wikipedia.org/wiki/List_of_unsolved_problems_in_physics https://en.wikipedia.org/wiki/List_of_unsolved_problems_in_p...

rotorblade 12y ago
Oh, I do simplify a lot and hide myself under "Fundamental physics". You are absolutely right to call me out on that. :-) But lets think about one of the examples that you brought up: > - Black hole information paradox This is indeed a big question, but I would discard this in what I wrote since: What is the experiment here? There is theoretical evidence for the Black hole entropy, but even if we could create black holes, which has so far not been accomplished by the LHC, how would you measure it? It is a bit more difficult than a gas where you could deform it and measure temperature etc. So this I would discard because I was considering discrepancies between theory and experiments. > - Mechanism for... some of these I would exclude in what I wrote because they might be explained by current theories, but it is just not known how exactly. Take ultra high energy cosmic rays, there are Shock-front acceleration mechanisms, Supernovae explosions etc that are candidates, and if I understand the formation of that unsolved problem correctly it is to among these candidates identify the correct one or the main one (or if the candidate is not among the ones we know now, find a new one and explain it).

rotorblade 12y ago

Oh, I do simplify a lot and hide myself under "Fundamental physics". You are absolutely right to call me out on that. :-) But lets think about one of the examples that you brought up: > - Black hole information paradox This is indeed a big question, but I would discard this in what I wrote since: What is the experiment here? There is theoretical evidence for the Black hole entropy, but even if we could create black holes, which has so far not been accomplished by the LHC, how would you measure it? It is a bit more difficult than a gas where you could deform it and measure temperature etc. So this I would discard because I was considering discrepancies between theory and experiments. > - Mechanism for... some of these I would exclude in what I wrote because they might be explained by current theories, but it is just not known how exactly. Take ultra high energy cosmic rays, there are Shock-front acceleration mechanisms, Supernovae explosions etc that are candidates, and if I understand the formation of that unsolved problem correctly it is to among these candidates identify the correct one or the main one (or if the candidate is not among the ones we know now, find a new one and explain it).