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  1. C

    B Matter - antimatter asymmetry

    Here is an example: https://press.cern/backgrounders/matterantimatter-asymmetry I've heard many theoreticians physicists saying the universe is dominated by matter because after the it is what it has left after some period of annihilation processes. I don't know if this is very well...
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    B Matter - antimatter asymmetry

    It is only an example in classical terms related to the Big Bang theory. Classical physics works accepts infinite precision in principle so if you start with a symmetrical system, the symmetry is preserved all the time. We know classical physics doesn't hold at fundamental levels.
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    B Matter - antimatter asymmetry

    What does quantum mechanics have to say about this aspect? Matter usually differs by antimatter having opposite charge. It is said that the Universe in the early stages should have created equal amounts of matter and antimatter. The total charge is conserved no matter the interactions and if...
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    B Gravitational wave's velocity

    I've seen some analogies trying to explain gravity to general public using as a model water flowing towards a sink hole in the place of some massive object. I've also seen scientist talking about simulations using air instead of water for a 3d effect, and sound waves. Sometimes close to...
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    I Can two gravitational waves orbit each other?

    Gravitational waves spread-out in all directions. How is it possible to have them spinning around each other? Light can modelled as plane waves where all individual waves are parallel to each other, as part of a beam. Will gravitational waves do the same thing in principle? I suppose they can...
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    B Gravitational wave's velocity

    Thank you. I thought quantum graviton models gravity so that it gives the same effect for macroscopic objects but not manipulating spacetime curvature but by considering gravitons force carriers similar to photons as force carriers of the electromagnetic field. Quantisation of spacetime...
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    B Gravitational wave's velocity

    Thank you. But my example is not important anyway. I was only an example of some concept that is easier to explain which of course it doesn't apply to our reality. But the concept of a graviton can be taken into consideration. Even gravitons through a flat spacetime are simpler to understand...
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    B Gravitational wave's velocity

    Thank you. I mean in SR (and we imagine we don't know anything about GR) you can treat gravity as a regular force, generated by a field around massive objects and have waves in that field similarly to the electromagnetic field. But it's only an example that if gravity was like that it would have...
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    B Gravitational wave's velocity

    In flat Minkowski spacetime, everything that travels at c, relative to some observer, it travels the same speed relative to any observer. If we refer to gravitons as bosons through this flat spacetime, it is clear they can be defined as travelling at c. And you can even some classical...
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    B Double slit experiment ratios

    I understand that for this kind of experiments you use a laser source which is a light beam that is then passed through a filter can let only a low amount of photon passing through in a given time. I suppose you first need to adjust the apparatus without the filter in place.
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    B Double slit experiment ratios

    But for the setup above the CC is replaced by photon counters. It says in the OP. The detectors are supposed to capture most of the beams so that after some number n of photons entering the double slit, I suppose we will get n on D0 and n/2 for D1 and D2.
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    B Double slit experiment ratios

    Here is a setup that only uses fixed detectors. Will the ratio between the number of detections at D0 and the sum of the numbers detected on D1 and D2 be close to 1? For this question instead of the coincidence counter, 3 simple counters are needed. Also the detectors D1 and D2 need some lenses...
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    B Particle pair creation probability

    I know that a high frequency light beam is more likely to generate a virtual electron-positron pair than a low frequency one. Can this probability depend on the reference frame? It seems there is a paradox. How do we explain it?
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    B Magnetic moment of electrons

    Yes, but in a non uniform field pointing down (N-S) why would they precess to point up? QM uses these mathematical concepts to model systems so that the results matches the experimetal results but also can give answers to more complex situations before you will actually perform the experiment...
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    B Magnetic moment of electrons

    That means the electrons that go up will have magnetic moment pointing up and there should be a force pointing down because the north pole repells the north pole of the electron. I understand you get the entanglement as spin up goes up, spin down goes down, but why the force is in opposite...
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    B Magnetic moment of electrons

    If electrons have a magnetic moment (or behave like they have) why don't all orient North Up in a magnetic field (pointing down)? Plus, if thought as magnetic dipoles, like poles repel, therefore all should point the same direction. In a Stern-Gerlach apparattus shouldn't the magnetic moment...
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    I Quantum entanglement information

    It is the same as having a dice with 3 faces, two green, one red, the probability of getting green is 2/3.
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    I Stern-Gerlach using magnets

    The classical prediction results are similar to the experimental results. But I've seen many presentations (not conclusions from scientific research) that say the magnets will do roughly an even distribution between the two poles...
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    I Stern-Gerlach using magnets

    I mean you can prepare some particles by a measurement for example for up/down axis, then all particles that were found in up state, will be found in an up state on the following measurement that needs to be also for Up/down. "Remember" is not the right word, though.
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    I Stern-Gerlach using magnets

    In the experiment with real magnets it seems that unlike iron balls, the magnets would separate into two groups. The smaller the magnets, I suppose, the better they would separate. However, electrons can remember states from previous measurements. I don't expect these little magnets to do that.
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    I Stern-Gerlach using magnets

    There are ways of manipulating individual atoms but I'm not sure if you can make them keep their magnetic moment lined up to their lattice. But I was only interested in some experiments tracking normal magnets.
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    I Quantum entanglement information

    Thank you. I still don't understand why this conclusion. I can only deduce that we cannot send information using entanglement (there is nothing we can do on a entangled particle to be detectable by measuring its entangled pair), not even at lower speed than c. I'm not arguing that information...
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    I Quantum entanglement information

    I'm sorry. I only wanted to clarify this. Does "No communication theorem" alone demonstrate information cannot travel faster than light?
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    I Quantum entanglement information

    "Einstein, Podolsky, and Rosen argued that "elements of reality" (hidden variables) must be added to quantum mechanics to explain entanglement without action at a distance. Later, Bell's theorem suggested that local hidden variables of certain types are impossible, or that they evolve...
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    I Stern-Gerlach using magnets

    Oh, in fact my intention was to delete the word real. There should be an advantage of using small regular magnets (neodymium for example), that would consist of a number of atoms like from 1 micron total size down to even 10 atoms (at this size I suppose we don't need magnetic materials anymore)...
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    I Stern-Gerlach using magnets

    Is there any study involving real magnets behaviour shot through Stern-Gerlach gates? I've seen something using rather large magnets[1], but still the pattern showed two bulges. I if suppose using very small magnets the split-up would be much clearer. After all these magnets are not simply...
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    I Quantum entanglement information

    If the events are spacelike separated they cannot be cause and effect and since they states are ways opposite there should have a common cause which points to a hidden variable. If there is no hidden variable then there is an instant effect at a distance. It is clear that there is no effect at a...
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    I Quantum entanglement information

    It is said that the measurement done on a particle instantly affects its entangled pair because Bell's theorem excludes a hidden variable. That means there is a cause and an instant effect at a distance. Say we have two entangled particles A and B. If there is no hidden variable then the state...
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    I Which tank fills first

    When the water level exceeds the height of the end of the pipe the water will flow through it. For this rule the tanks need to have no lid You only need to be careful a about details. (The answer is clearly F). For example if you let the water go between C and D and block the pipe between D and...
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    Question about bicycles and inertia

    If you plan to use the motor to take you at 25-30 kph its fine you can have some advantages like better acceleration more ground clearance (also less prone to break the pinion shifter) less likely for the chain to come off. But if you think the motor can take you to 40-50kph or more where you...
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