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Everything posted by MigL
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Heisenberg's uncertainty principle for dummies?
MigL replied to To_Mars_and_Beyond's topic in Quantum Theory
They may be fellow countrymen, but I don't think Studiot is as 'quirky' as P A M Dirac is reputed to have been. What do you think ? -
What 'time' are you referring to ? Proper time is necessarily linear, as the clock moves along your wordline. "In relativity, proper time along a timelike world line is defined as the time as measured by a clock following that line. It is thus independent of coordinates, and is a Lorentz scalar.[1] The proper time interval between two events on a world line is the change in proper time." Co-ordinate time is not necessarily linear. "Coordinate time is the time between two events as measured by an observer using that observer's own method of assigning a time to an event. In the special case of an inertial observer in special relativity, the time is measured using the observer's clock and the observer's definition of simultaneity." Quotes from Proper time - Wikipedia
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Heisenberg's uncertainty principle for dummies?
MigL replied to To_Mars_and_Beyond's topic in Quantum Theory
It was also, IIRC, derived from experimental data, not first principles. I could, however, be wrong; it has been a while since I read that. And it was P Dirac, I believe, who showed that E Shrodinger's wavelike differential approach, and W Heisenberg's matrix mechanics were equivalent. -
Heisenberg's uncertainty principle for dummies?
MigL replied to To_Mars_and_Beyond's topic in Quantum Theory
Frankly, I haven't a clue what you're referring to, half the time. I gave an example of a classical wave which demonstrates uncertainty. And you started talking about 'collapse'. What 'collapse' are you talking about here ? Or is it simply nonsense, as usual ? -
Didn't have time to read all your post. The first part, which deals with the fact that vision ( used by most predators at long distance ) can be asily fooled by evolved 'countermeasures', is not evidence for your assertions. It is simply that as evolution ( adaptive survival of the species ) has evolved sharper eyesight in predators, it has also evolved camuflage in their prey.
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Noahs flood has been proposed as ancient memories of the Zanclean flood, of 5 million years ago, that flooded the Mediterranean basin. I find it hard to believe that our ancestors of 5 million years ago ( Australopythecus, I believe ), could preserve such 'memories' through story-telling, since Homo Sapiens only emerged ( in Africa ) about 300 000 years ago.
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I predict that, when AI gains 'imagination', and starts believing it has a 'soul', we'll be close. Of course, by then, it will have ALL human failings, and send Terminators back in time to kill me.
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Heisenberg's uncertainty principle for dummies?
MigL replied to To_Mars_and_Beyond's topic in Quantum Theory
What do you mean by a classical wave 'collapse' ? -
I know what you mean ... I was thinking about it overnight, and almost ready to give in to Halc and md65536 PoV, thinking that maybe I had made some incorrect assumption. Then Markus posted, and now I'm not sure either. It seems to be a scale problem, with differing scenarios, and gruesome calculations. But I did enjoy th discussion 🙂 .
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Heisenberg's uncertainty principle for dummies?
MigL replied to To_Mars_and_Beyond's topic in Quantum Theory
The best example I can think of involves classical wave motion, and, apparently, was an example used by R Feynman. To localize a wave packet, and so determine its position to arbitrary precision, it has to be built up of many ( infinite ? ) harmonics, such that wavelength/frequency, and therefore momentum, hv, are increasingly indeterminate. The alternate, where the wave has an exact wavelength/frequency ( and momentum ), sees a wave of infinite length. -
I don't understand, JC. The photon has to hit your eyes (radially ) for you to see it. If it moves tangentially, at the speed of light, it will not be there anymore when your eye gets there. As for red shift, the wavelength of radially outgoing light is redshifted to infinity at the EH, as measured at any distance outside the EH. That means it disappears; there is nothing imperceptible about it. ( or should that be perceptible ? ) Except the OP, where he says ... "At some point, the astronaut sends a message basically saying "My feet are now inside the event horizon", and Earth eventually receives that message." IOW, he 'sees' ( gets information from ) his feet, inside the EH, and relays that information arbitrarily far away, to Earth. For simplicity's sake, I recommend considering only radial movement, and Schwarzschild BHs
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If it went 900, it wouldn't hit your eyes. ( so you still wouldn't see it )
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Heisenberg's uncertainty principle for dummies?
MigL replied to To_Mars_and_Beyond's topic in Quantum Theory
Even if you could devise an experiment which didn't involve an interaction, you could never measure momentum and position of a quantum particle to arbitrary precision. The uncertainty is inherent to the model, because the model, QM, necessarily treats them as waves. ( the clue is in the name, wave function ) -
Maybe the confusion stems from the fact that we can't imagine not being able to see our own feet ... Light, like any nformation, cannot travel to the exterior of the EH of a BH. Gravity, or rather, the pre-existing gravitational field, does. When we consider very large BHs, it is the differential gravity which leads to tidal forces, and since the differential gravity is small for very large radius, there is no spaghettification, and things are normal ( GRAVITATIONALLY ) for a laarge BH. For a small BH, however, the differential gravity is very large because of the small radius, and the tidal forces will spaghettify. That does not mean that everything else is also 'normal' on crossing the EH of a large BH. If you had a transmitter attached to your feet, could they transmit a signal to a receiver on your head, after your feet had crossed the EH, but your head was still outside ? And a repeater on your head, which is still outside the EH, could then transmit the signal to infinity ? Could a transmitter that is further inside the EH transmit a signal to your feet, which could then tranxmit it to your head ? Could you have a chain of transmitters, all sending information to the next, all in close proximity, lowered all the way down to the center, and transmit information, in small steps, to your head, and out to distant observers ? If you answer yes to any of the above, I congratulate you. You have just 'discovered' a way to probe the singularity/center of a BH. ( i'm being sarcastic 🙂 ) Addendum: the light cone of your feet is not the same as the light cone of your head. Your feet have their own proper time, and will cross the EH, while your head is still an external observer. Before reaching the EH, the light from your feet ) moving towards your head ) will be red shifted, and seemingly stop ( or rather, fade away ) at the EH. It will be followed by the disappearance/stopping of your knees, thighs, hips , waist chest and shoulders; all fading away to infrared and nothingness before your head ( and eyes ) cross; and you see nothing else ahead of you. I will grant you that, depending on your speed of radial infall, those frozen, red-shifted images will experience some blue-shift because of your infall speed, so you may 'crash' into a sort of frozen image at the EH ( but I would think not, as the images have their wavelength stretched to infinity at the EH, and you cannot be moving fast enough to blue-shift them back ).
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His 'package' ? I think Joe is probably much more indebted to Pfizer for Viagra, not the Covid vaccine.
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This is no different than the case where the iron particles are suspended in water with no external magnetic field. The iron particles stay in suspension because they are josteled about by the kinetic energy of the water molecules in the weak gravitational potential. When you apply the external magnetic field of much greater potential, the iron particles now have much greater kinetic energy as they move towards the magnet, imparting some of their kinetic energy to the water molecules and heating it up.
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How will a highschool react to this type of student?
MigL replied to CurseNight102's topic in Psychiatry and Psychology
Is this a screenplay for a prequel to DieHard, when John Mcclane is in high school ? And is "Yippie-kai-yay, mother f***er" appropriate language for a high-schooler ? -
lways thought Purple Rain was strange. I only wanted to see people laughing in the purple rain. Never even heard of purple gold.
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I will have to disagree with you gentlemen. Light does not stand still, even inside the EH, so there is no 'catching up' to the light emitted by your feet. As soon as your feet cross the EH, light emitted inexorably moves towards its future, the center of the BH. There is no path backwards to your eyes, and you cannot catch up to it. As for md's assertion, any light that is 'frozen at the EH, is red -shifted to infinite wavelength long before it can reachthe head which is still outside the EH, even for such a miniscule distance. So if no light can possibly reach your eyes, what do you see ??? Sorry JC, we cannot be inside the EH of a BH right now. The geodesics that light ( or anything else ) must follow inside the EH, have only one direction, towards the future singularity. That is what GR predicts, f this happens to conflict with observation, I will stand corrected.
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Light has no path ( geodesic ) that leads away from the center of the EH, or outside of the EH. We are not discussing tidal forces as md65536 specified an extremely large BH where tidal forces at the EH are trivial; and they have nothing to do with 'seeing' your feet ahead of you.
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Taking the PoV of the feet first, infalling astronaut ( proper, where the clock is attached and moves along his worldline ), I would think, as he approaches the EH, he would see it grow disproportionately larger, as it rises up like a 'cup' to envelop him, eventually 'closing off' behind him, due to the strongly curved spacetime. This is all before any part of himself crosses the EH. Just before he is fully enveloped by the EH, and most certainly after, he would lose sight of anything ahead of himself, such as his feet, as light has no way of coming 'back' to his eyes. It would be a dark journey to his future doom.
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Does stereotypical nerd or geek exists?
MigL replied to CurseNight102's topic in Psychiatry and Psychology
I don't know. Ask Bill Gates. -
The Spirit Of Science Forums
MigL replied to PrimalMinister's topic in Suggestions, Comments and Support
All I'm getting out of all this, is that some people post fantasies without any mathematical or observational evidence other than to say that the current accepted system has lots of things wrong with it. We don't care that GR, QFT, Big Bang, etc. has gaps, is not applicable in some domains, or are not compatible with each other. They are works in progress, as is all Science, and in no way evidence for your particular fantasy. Provide evidence for your ideas, or ask the question whether your idea is possible ( and accept the answers given ). Don't make assertions, and say it must be true because the current system is wrong. ( at least until we get a WAG section; then you can post it there ) Oh, and I also got that INow likes Arby's. Used to like it at 3 in the morning, after bar-hopping in the US, in the 80-90s, then they started opening in Canada; had it once, never went back again. -
What kind of telescope could see planets in other galaxies?
MigL replied to Maximum7's topic in Speculations
You can easily calculate the aperture diameter needed, for visible light, to get the desired resolution. The Rayleigh criterion is a simple formula. You don't need to know how it works; just plug in approximate numbers. -
The reasons why they clash are well known. Start another thread if you want those reasons explained to you. In this thread those reasons are off-topic.. Or, as Dim says, 'bollox'.