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| Thread ID: 55052 | 2005-03-01 10:10:00 | Teleportation / Time travelling... | Renmoo (66) | PC World Chat |
| Post ID | Timestamp | Content | User | ||
| 329475 | 2005-03-04 08:11:00 | Well, not really. The latest caesium clock operates at about one millionth of a degree above absolute zero. It has an accuracy of about 1 second in 20 million years. So being at absolute zero really has nothing to do with time. Not absolute time, no. But as I was referring to a closed system, then time as observed within the closed system would effectively stop. Absolute zero has no effect on radioactive decay either, or the motion of electron orbiting the nucleus. But for an observer who was frozen at absolute zero, and then moved, and then unfrozen, it would appear "instantaneous". Also, Einstein predicted that an observer accelerating away from a point would observe time slowing down for that point. This has been proven by comparing two synchronised clocks after one had been taken on a plane trip around the world. The prediction of course, is if you can exceed the speed of light, then time would run backwards. |
vinref (6194) | ||
| 329476 | 2005-03-04 08:24:00 | This is in theory, of course, since Joe Bloggs would sooner die than reach absolute zero and then be thawed out. | agent (30) | ||
| 329477 | 2005-03-04 08:49:00 | Not absolute time, no. But as I was referring to a closed system, then time as observed within the closed system would effectively stop. Absolute zero has no effect on radioactive decay either, or the motion of electron orbiting the nucleus. But for an observer who was frozen at absolute zero, and then moved, and then unfrozen, it would appear "instantaneous". Also, Einstein predicted that an observer accelerating away from a point would observe time slowing down for that point. This has been proven by comparing two synchronised clocks after one had been taken on a plane trip around the world. The prediction of course, is if you can exceed the speed of light, then time would run backwards. 'Fraid I have to agree to disagree. The Special Theory does not deal with acceleration, only uniform motion, and the principle of equivalence of systems in uniform motion. As far as time dilation is concerned, this is most easily envisaged and explained by the concept of clock synchronisation. To initially synchronise clocks in different frames having a relative velocity, a light/radio signal has to be sent between clocks, this signal travels at the velocity of light regardless of the relative velocity of the frames of reference. To see the time of another clock also requires such a signal to go to and fro between the frames. Then when the sums are done the relativistic eqations fall out. They contain terms like sq rt (1-v^2/c^2) in the denominator, so if v>c we have root of a negative number. Then time dilation becomes imaginary ;) , it does not run backwards :stare: |
Terry Porritt (14) | ||
| 329478 | 2005-03-04 09:24:00 | Using absolute zero for a closed system - as in a stasis field, could work subjectively. But the difficulty is that at absolute zero (which doesn't occur anywhere we know of), matter falls apart. Ultimately that is the definition of absolute zero - no energy at all. The other matter which is interesting is that the speed of light and Einsteins discovery about time dilation have real applications in real life. Technicians have to allow for light-speed delays with satellites. And their clocks run slightly slower which at computing and data transmission speeds, is a significant when you are bouncing info into space and back. Most people think Einsteins stuff is all theoretical but his theories have real applications. |
Winston001 (3612) | ||
| 329479 | 2005-03-04 16:59:00 | Hey guys, I started this thread few days (or is it weeks?) ago with no expectation that people might care about this topic. But hooha! 40+ replies. Anyway, someone please point to me the relationship between e=mc2 and teleportation. It seems that light speed plays an important role in teleportation. Cheers |
Renmoo (66) | ||
| 329480 | 2005-03-04 18:45:00 | Using absolute zero for a closed system - as in a stasis field, could work subjectively . But the difficulty is that at absolute zero (which doesn't occur anywhere we know of), matter falls apart . Ultimately that is the definition of absolute zero - no energy at all . Ahem, no, not at all :D I'm afraid a lot of my physic on this topic goes back to undergraduate days, but there is such a concept as zero point energy . Matter doesnt fall apart . Then always one has to get back to consistency of physical measurement, and mutual agreement on a set of rules and principles before debates such as these can be meaningful . For example " a closed system", by definition if the system is closed, then no information about it can be obtained from another frame of reference . If you are inside a closed system, then you have no information about anything else, or even if there is an "outside" . "Absolute time", this is reminiscent of the all pervading "aether" . All measurements are relative . |
Terry Porritt (14) | ||
| 329481 | 2005-03-04 20:59:00 | Closed systems leads to am interesting theroy posed back in the 30's. It involves a cat in a box and It's HERE (whatis.techtarget.com) if anyone is interseted. | craigb (4884) | ||
| 329482 | 2005-03-04 22:08:00 | Hmmm........ Seems to me that there are not enough factors involved here to sustain this thread for the length of time it undoubtably deserves, so how about throwing this into the equation as a diversionary issue? What is the transportation time (or speed) of telepathic communication. Is it instantaneous, or is it too, tied to the speed of light? Never mind any debate about whether telepathy exists or not, anybody who has been married for long enough knows that two-way communication of thoughts happens often enough to be way past the realms of simple coincidence. I am not talking about second guessing when both parties are present and contextual events or subliminal messages can lead to common thoughts either. I am referring to the sudden urge to make a telephone call, the knowing that something has happened (not necessarily bad either) or, for example, the standing joke in our household that no matter how indefinite the term of her absence may be, Mrs T will always arrive home within five minutes of my making her a hot drink. I can't hear her car at that distance, I often have no idea what time she went out, where to or what for because I have returned to find her absent. Something just tells me she is due. Cheers Billy 8-{) (we need an emoticon for pot stirring) :D |
Billy T (70) | ||
| 329483 | 2005-03-04 22:17:00 | I've got another notion. The only way to teletransportation is to escape from time. But, on the other hand, time is invented by human. Time is relative to the earth's rotation. If earth does stop rotating, could it be possible that the time will stop? Is time really a factor here? Cheers | Renmoo (66) | ||
| 329484 | 2005-03-04 22:51:00 | I've got another notion . The only way to teletransportation is to escape from time . But, on the other hand, time is invented by human . Time is relative to the earth's rotation . If earth does stop rotating, could it be possible that the time will stop? Is time really a factor here? Cheers :eek: It all depends on how quickly the Earth stopped rotating, if suddenly, then we would all be thrown off, and time would stop for everyone . :rolleyes: Reminds me of H G Wells and "The Man Who Could Work Miracles" . We are entering metaphysical debate, does something exist in the absence of human observation or presence? The Earth is just one huge convenient artifact that was used for the measurement of time, the mean sideral second, the day, the year, the seasons etc . Now we have atomic clocks, independent of the Earths' rotation . Currently there is activity to try to replace the chunk of metal that is the standard kilogram . Physical artifacts are not very good for standards of measurement . Just imagine an over enthusiastic technician, polishing and cleaning the standard kilogram each day to keep it shiny . He rubs off some atoms each time, and the kilogram gets lighter, we all start getting heavier . :blush: Metals evaporate, change size, absorb gases etc, they are not invariant . Same with the Earth, gains mass from space, loses mass when we shoot stuff into space, it is not a really good time keeper . If all the Chinese jumped up and down together, it may well cause a change in rotation! |
Terry Porritt (14) | ||
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