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| Moderated by: MrParanormal | Page: 1 2   |
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MrParanormal Original500© Member  A soft answer turns anger away
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Playing fast and loose with time: a new study suggests that time travel is not quite impossible. by William F. Allman Time travel has popped from the annals of science fiction into the realm of scientific respectability at least in theory, that is. By combining two well-established principles originally outlined by Albert Einstein nearly a century ago in his theories of relativity, three theoretical physicists have proposed a novel scheme that appears to permit a limited sort of time travel. The scientists' result is not antything close to a blueprint for building the sort of time machine that science-fiction heroes are forever leaping into to explore the lives of cave men or peek into the future. But it suggests that either Einstein's equations are wrong or that the universe is governed by some very different principles from what physicists have long assumed. The notion that the causes of an event taking place in the present could be eliminated by traveling into the past and changing history has always made physicists (not to mention stock speculators and newspaper publishers) squeamish about the idea of time travel; physicists have thus held that there must be laws that provide a kind of "cosmic censorship" that prevents moving through time, and thus any tampering with the sequence of events. Various theoreical scenarios for time travel have been cooked up in the past, but in each case physicists have found physical laws that blocked it. The new study, however, appears not to violate any known physical laws. "We're asking, if you take Einstein's equations far enough, will they get you in trouble?" says Michael S. Morris of the University of Wisconsin, one of the co-authors of the new study. "We're suggesting that maybe they will, because at some level we may have to abandon either Einstein or causality"-the' basic principle of physics that one event Time flies. The authors' hypothetical time "machine" starts with Einstein's famous, and apparently paradoxical, discovery that time is not constant throughout the universe, but rather varies depending on the velocity at which the timekeeper is traveling. While to an astronaut, a clock on board a speeding spaceship will appear to tick at a normal rate, to a stationary observer on Earth, the clock will appear to be marking time very slowly. This apparent slowing of time applies not only to clocks but to everything in the spaceship, including the astronauts, and has given rise to what is known as the "twin paradox": When the speeding astronaut returns to Earth, he will have aged less than a twin brother he left behind. This bizarre time-slowing effect has been demonstrated by researchers who synchronized two highly accurate atomic clocks and then flew one of the pair aboard a high-speed jet for hours. When the two clocks were reunited, the airborne clock had fallen slightly behind its stationary twin. The second Einsteinian principle that goes into the time machine is the warping of space by gravity. This idea is often explained by analogy to a worm crawling over a sphere. To the worm, the world is flat. Crawling from one spot on the sphere to another in what seems to be a straight line, the worm doesn't realize that it is actually tracing out a path that curves in three-dimensional space to follow the sphere's contour. The worm also doesn't realize that it could take a shortcut by burrowing through the core of the sphere. Similarly, what appears to us as three-dimensional space is, according to Einstein's theory of relativity, bent in dimensions that we cannot easily imagine, and a "wormhole" could connect two seemingly distant points in space. To turn a wormhole into a time machine, say the physicists, technicians in some "arbitrarily advanced" civilization could harness the gravitational forces necessary to make one end of the hole move back and forth at extremely high speed while keeping the other end stationary. Like the astronaut in the twin paradox, this rapidly moving end of the its stationary counterpart. By entering the "older" end of the wormhole and coming out the "younger" end, a person could theoretically travel from the present to the past. Keeping the door open. While the physicists' calculations suggest there's nothing to prevent all this from happening, they admit that no one has actually ever seen a wormhole. Calculations by Morris and co-authors Kip Thorne and Ulvi Yurtsever of the California Institute of Technology imply that a wormhole can be kept open only under some strange and exotic physical conditions. Phenomena that under normal circumstances exist only in infinitesimally small particles for infinitesimally short periods of time would have to exist throughout the wormhole for as long as it remained open. Even if a wormhole time machine were possible, it wouldn't permit the kind of time travel fancied by H. G. Wells and others who have mused on the possibility of traveling far into the past or future. Even though members of an advanced civilization might be able to cause one end of a wormhole to age less slowly than the other, at best they would only be able to make time stand still at the instant the tunnel was created, not move it back any further into the past, and they couldn't move the other end ahead into the future. There's at least some circumstantial evidence that the more far-reaching kind of time machines envisioned by sciencefiction writers will never be created, even by the most technologically advanced civilization imaginable. If such a machine were ever to be built, a traveler from the future probably would already have shown up here by now.
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Lon Guardian1000© Member  Septuagenarian
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Time travel is not only a possibility, but a reality. Right now I am posting from California and in a flash I will be posting from New Zealand.
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Lon Guardian1000© Member Septuagenarian
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Whoosh---------Just that fast---------here I am in Wellington.
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Brian Grand Poobah of Moderation 
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I don't see how backwards time travel could ever be possible, and I don't think the article really addresses the problem. The problem is the Grandfather Paradox. If you go back in time and kill your grandfather before your parent was born, then at best, you've created a fork in the multiverse, and you're never going to get back to the future that you left. At worst, you've just created a contradiction that will utterly destroy the universe (which I guess is actually kind of impressive, if you think about it  ).
 "It's been a long December, and there's reason to believe maybe this year will be better than the last." -- "A Long December", Counting Crows |
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Marie5656 Forum-Blogger© Original500© Member  Just hanging out
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I am with Brian on the Paradox thing. Seems going back to change events would create real havoc. Also, traveling to the future? How can we travel to a time that has not yet happened? If backward travel was possible..would any of us be able to go simply as an observer?
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MrParanormal Original500© Member A soft answer turns anger away
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So do you guys think The Grandfather Paradox really makes time travel impossible? Or is it more of a scary aspect of the prospect? If we can't travel into a future we cannot see I find myself speculating How God sees a future before it happens, Or does he have a future he already fnished waiting for us to fill? If so can were travel to it and back unbeknownst to us right now?
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Marie5656 Forum-Blogger© Original500© Member Just hanging out
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Maybe that is what is meant by destiny..that our future is plotted out from the time we are born, and we cannot change it?
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Brian Grand Poobah of Moderation
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MrParanormal wrote: So do you guys think The Grandfather Paradox really makes time travel impossible? Or is it more of a scary aspect of the prospect? If we can't travel into a future we cannot see I find myself speculating How God sees a future before it happens, Or does he have a future he already fnished waiting for us to fill? If so can were travel to it and back unbeknownst to us right now? I don't know how the God thing works. I'll leave that to more theological people.  As for the Grandfather Paradox, I think it makes effective time travel impossible. (By "effective", I mean any time travel that can happen into the past would be either unchangeable or into a different timeline, thereby rendering our present timeline unchanged.) I don't see how it could be any other way. Time travel to the future doesn't suffer from those kinds of problems, but I think traveling into the future has a lot less appeal to people.
"It's been a long December, and there's reason to believe maybe this year will be better than the last." -- "A Long December", Counting Crows |
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Saint Forum-Blogger© Pioneer100© Member  Polymath
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actually, I seem to remember an article in the paper about eight years ago where a French team was trying to produce hypergravity, but ended up sending a hydrogen atom back in time one second. For one second the atom had two electrons, the only explanation they had was that it was the same electron sent back in time one second.
A^2 + B^2 = C^2 |
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Brian Grand Poobah of Moderation
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Saint wrote: actually, I seem to remember an article in the paper about eight years ago where a French team was trying to produce hypergravity, but ended up sending a hydrogen atom back in time one second. That's really weird. Do you know where that article is, Saint? I'd like to read it. I have a hard time grasping why sending an atom back in time would produce another electron (without, for example, producing another atom entirely). And did time go backwards in the lab itself?
"It's been a long December, and there's reason to believe maybe this year will be better than the last." -- "A Long December", Counting Crows |
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MrParanormal Original500© Member A soft answer turns anger away
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Brian Wrote
I question that brain, after giving it some thought I wonder about what if I was to travel into the future and notice that America was the only third world like country in the world and after investigating come to the conclusion that Bush's war on terror was the cause, and decided to come back and change it and assasinate Bush, before the incident occurred, and his replcement made a decision that brought worse concequences on us, How would a incident simular to that fit into your analyes?
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Marie5656 Forum-Blogger© Original500© Member Just hanging out
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So is there such a thing as a reverse paradox? If you see something in the future, and change something in the "past"..or our time, how can we be sure it will affect the future?. I think I have just repeated your question, Mr. Paranormal. Or will there just be a paradox for the time beyond the future? Let me go one more step....and this is just coming out of the fact that I am tired, and rambling and should not even be putting words to my thoughts right now...but won't our vote on Election day change the future? If Obama wins..and becomes the first black president...is that affecting our future? Would love to travel into the future to see what will happen.
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MrParanormal Original500© Member A soft answer turns anger away
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I think you make aexcellent point and have a excellent question. from this I see that if time travel were possible the the possibilities would be infinate.Make you wonder about little things like turning right or left either has the potential to change someones future.
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Marie5656 Forum-Blogger© Original500© Member Just hanging out
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Have you ever seen a movie calle Millenium. I think it is from the early 90's, or late 80's. It deals with time travel, and paradoxes and such. It is based on people from Earth's future....and the human race is dying off. So some folks are emploued to travel back in time..and remove live people from planes as they are about to crash and replace them with body doubles. Paradoxes come when a character played by Kris Kristofferson meets and falls for one of the travelers. The story is not as complicated as I am making it..but fasinating.
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MrParanormal Original500© Member A soft answer turns anger away
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I missed that one but you wet my apetite, I think I will get it for me and the boys for our guy time.
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