time travel, is it possible?

[Kaboom]

this again?

 

[Mike_D202]

I read an article on yahoo last month that a scientist was running experiments pretty soon to try and create a wormhole using lasers spinning around rapidly (or something like that), he learned from the experiment that was mentioned earlier about scientists discovering they can send light back in time in just nano-seconds.

 

[Fried Gold]

actually the faster you go and the closer you are to a massive object your time goes slower than someone who isn't.

If you go at even half the speed at light and buzzed around for a year, two years would have passed on earth, but one year would have passed for you.

If you lived on a planet orbiting a Neutron star one week would pass for you but a million years would pass on earth..

General and Special Relativity prove this of course.

According to Machx72, it doesn't as he has not seen it with his own eyes

 

[Machx72]

According to Machx72, it doesn't as he has not seen it with his own eyes

I love how you bring up my name well after the fact that I'd stated I very well may be wrong, and that I simply hadn't heard nor seen any proof of it- that I'd only heard of its theories.

When you pull your head out of your own ass long enough to see what you're typing, maybe then I'll listen to your arguments, but until then, I've yet to see what you have to say as anything other than support of others' theories.

 

[moraldeficiency]

I read an article on yahoo last month that a scientist was running experiments pretty soon to try and create a wormhole using lasers spinning around rapidly (or something like that), he learned from the experiment that was mentioned earlier about scientists discovering they can send light back in time in just nano-seconds.

I seriously want to see this article.

 

[Galactus]

New Theoritical Model Eliminates Barriers To Time Travel


by Staff Writers
New York, NY (SPX) Aug 07, 2007
A Technion-Israel Institute of Technology physicist has developed a theoretical model of a time machine that could enable future generations to travel into the past. In his paper published in the July issue of Physical Review, noted time-travel theorist Professor Amos Ori provides practical solutions to a number of criteria long seen by other experts as obstacles to the realization of time travel.
Ori's theory is actually a set of mathematical equations describing hypothetical conditions that, if established, could lead to the formation of a time machine, technically known as "closed time-like curves."

Previous theories addressing time travel are well grounded in Einstein's General Relativity theory. Renowned physicist Stephen Hawking has called time travel "an important subject for research," but has also proposed some of the strongest challenges to the concept. General Relativity states, among other things, that the gravitational pull of large objects such as planets can actually bend time and space. Time travel research is based on bending space-time so far that the time lines actually bend back on themselves to form a loop.

"We know that bending does happen all the time, but we want the bending to be strong enough and to take a special form where the lines of time make closed loops," says Ori. "We are trying to find out if it is possible to manipulate space-time to develop in such a way."

While the possibility of time travel has never been eliminated, scientists have identified a number of physical challenges, including the perceived need for some form of exotic matter with negative density. Such matter is predicted by quantum field theory to exist, though only in quantities too small for the construction of a time machine.

In a 2004 paper, Ori outlined a set of conditions that would allow for the creation of a time loop without the need for exotic matter. That theory called for the time loop to form as a donut-shaped vacuum, inside which time would curve back on itself, so that a person traveling around the loop might be able to go further back in time with each lap. A sphere containing non-exotic, but unidentified matter, would in turn envelop the loop.

Ori's latest work eliminates the need for that unidentified matter. His new calculations show that the envelope can in fact be filled with dust, a simple modeling of which is used regularly in theoretical physics, while still allowing for the evolution of a time machine.

Ori also addresses the possibility of the initial conditions forming a point of infinite gravitational field that no one could pass (instead of a time travel loop). His current paper outlines a more robust system that would prevent such an occurrence. "The internal core is now mathematically protected," says Ori, "and it is easy to show that no irregularity could penetrate it." The paper also more thoroughly defines the required spherical envelope.

Ori says serious questions remain about the overall stability of a time machine. His own calculations - done in collaboration with Technion Ph.D. student Dana Levanony - and those of other physicists, suggest that the evolution of a time machine would be dependent on a very narrow range of initial conditions that might be difficult - or even impossible - to achieve. He is also working to show ways such a configuration could be achieved.

"If the proper initial conditions were achieved, the time machine would evolve on its own without any further intervention," says Ori, of the Technion Faculty of Physics. "It can be likened to shooting a ship with a cannon. Once the cannon is aimed properly and fired, the cannonball hits the ship on its own, driven solely by the laws of physics."

"The machine is space time itself," he explains. "If we were to create an area with a warp like this in space that would enable time lines to close on themselves, it might enable future generations to return to visit our time. We, however, could not return to previous ages because our predecessors did not create this infrastructure for us."

The Technion-Israel Institute of Technology is Israel's leading science and technology university. Home to the country's winners of the Nobel Prize in science, it commands a worldwide reputation for its pioneering work in nanotechnology, computer science, biotechnology, water-resource management, materials engineering, aerospace and medicine

 

[chaseter]

Time travel is not possible IMO.

 

[blind_fury]

archangels can time travel but not demons.

they've been condemned.

 

[Moviefan2k4]

I think the reason why time travel hasn't been accomplished is actually very simple: it's being supernaturally prevented by God. Think about it this way: in the film "Timecop", our hero stops criminals who seek to profit by altering the past. If we did accomplish the ability to traverse the time barrier, how many of us could resist the temptation to use it for personal gain? Also, bear in mind the famous "ripple effect" argument. Every person's life on this planet touches someone else's, and in turn, their's touches someone else's, and so on. If any of us were to alter time even one bit (be it past or future), how could we be guaranteed that our actions wouldn't lead to some horrible disaster down the road?

I personally believe humanity (in general) would probably use such a device like the machine in "Paycheck"; we'd use it for our own ends, not caring for the benefits of others...and ultimately, we'd destroy ourselves.

 

[moraldeficiency]

The first person with a time machine would be god.

 

[Darkly Dexter]

How can you say it's not possible? Dr. Emmett Brown did it, I saw it on tv!!!

 

[kytrigger]

I think the reason why time travel hasn't been accomplished is actually very simple: it's being supernaturally prevented by God. Think about it this way: in the film "Timecop", our hero stops criminals who seek to profit by altering the past. If we did accomplish the ability to traverse the time barrier, how many of us could resist the temptation to use it for personal gain? Also, bear in mind the famous "ripple effect" argument. Every person's life on this planet touches someone else's, and in turn, their's touches someone else's, and so on. If any of us were to alter time even one bit (be it past or future), how could we be guaranteed that our actions wouldn't lead to some horrible disaster down the road?

I personally believe humanity (in general) would probably use such a device like the machine in "Paycheck"; we'd use it for our own ends, not caring for the benefits of others...and ultimately, we'd destroy ourselves.

God has never stopped us from corrupting ourselves before, so why would he stop this?

 

[Moviefan2k4]

I didn't say corrupting, I said destroying. I suspect time travel would be abused by the majority of Earth's population, to one extent or another. Haven't you ever wanted to go back in time and fix a part of your own life that went horribly wrong? Well, what if by fixing that, you set up an entirely new chain of events, that could lead to a future you never wanted? That's the inherent danger of messing with time. By fixing your life, you may be unintentionally putting someone else at risk. We as mortals are bound by time, whereas God is not. To further quote Timecop...

"It's like throwing rocks in a river, and it causes ripples in the water...only now they're ripples in time. So, you can't go back and kill Hitler, much as we'd all like to, because for all we know it could lead to something that might even destroy mankind."

 

[moraldeficiency]

You're not really using a van damme movie as a reference are you? At least use Jackie Chan he's much better regarded in the scientific community.

 

[Erzan]

Time travel is possible.

The faster you move, the slower time relative to you.

Sciencitists have already proven this, it is a abo****e fact.

They got one atomic clock on a concorde (faster than speed of sound) and one on the ground, the starting point. and made it go travel forward and back at top speed. The clock on the concorde was slower than the clock on the ground by mili seconds. This same effect happens on the space shuttle when it blasts of into space, officially they are time travelers by like one seconds.

If you moved at light speed out into space, far far away for say one year, i think it is 5-10 years or so would of passed on earth. I am not sure how long would of passed but its more than a year.

Why do you think when superheros in comics move fast they are able to dodge bullets and incoming attacks? time moves slower for them and they are able to see the bullets coming towards them.

The only problem humans need to overcome, to achieve effective and worthwhile time traveling to the future, is being able to reach light year speeds and not dying in the process lol!

Problem is... once you do this, there would be no way back - well that is until time travel in the past is invented!

 

[Erzan]

Time travel is not possible IMO.

Traveling into the future is possible, we just need to overcome the effects of being splattered to death when trying to reach near light speeds. Which of course is going to be - understatement - very hard.

 

[lollycop]

I think its HIGHLY unlikely, but I never said its impossible...

 

[Mr. Credible]

How can you say it's not possible? Dr. Emmett Brown did it, I saw it on tv!!!

where we're going, we don't need roads...

 

[Mr. Credible]

but yeah, i don't see why it's not possible... i mean, time is just another thing, right?

we've figured out how to travel through all kinds of crap... we just need someone to think outside the box to come up with the idea... then the world will end.

 

[Mike_D202]

I seriously want to see this article.

Okay i think I found it. I went to wikipedia and found this small article in the "experiements carried out" section:

Some physicists have attempted to perform experiments which would show genuine causality violations, but so far without success. The Space-time Twisting by Light (STL) experiment run by physicist Ronald Mallett is attempting to observe a violation of causality when a neutron is passed through a circle made up of a laser whose path has been twisted by passing it through a photonic crystal. Mallett has some physical arguments which suggest that closed timelike curves would become possible through the center of a laser which has been twisted into a loop. However, other physicists dispute his arguments (see objections).

He also has a wikipedia entry, and heres his "time travel" project article:

Time machine project

For quite some time, Ronald Mallett has been working on plans for a time machine. This machine uses a ring laser and the theory of relativity. Mallett first argued that the ring laser would produce a limited amount of frame-dragging which might be measured experimentally, saying:

In Einstein's general theory of relativity, both matter and energy can create a gravitational field. This means that the energy of a light beam can produce a gravitational field. My current research considers both the weak and strong gravitational fields produced by a single continuously circulating unidirectional beam of light. In the weak gravitational field of a unidirectional ring laser, it is predicted that a spinning neutral particle, when placed in the ring, is dragged around by the resulting gravitational field. [R. L. Mallett, "Weak gravitational field of the electromagnetic radiation in a ring laser", Phys. Lett. A 269, 214 (2000). pdf

In a later paper, he argued that at sufficient energies, the circulating laser might produce not just frame-dragging but also closed timelike curves, allowing time travel into the past:

For the strong gravitational field of a circulating cylinder of light, I have found new exact solutions of the Einstein field equations for the exterior and interior gravitational fields of the light cylinder. The exterior gravitational field is shown to contain closed timelike lines.

The presence of closed timelike lines indicates the possibility of time travel into the past. This creates the foundation for a time machine based on a circulating cylinder of light. [R. L. Mallett, "The gravitational field of a circulating light beam", Foundations of Physics 33, 1307 (2003). pdf

Progress on funding for his program, now known as The Space-time Twisting by Light (STL) project is progressing. Full details on the project, Mallett's theories, a list of upcoming public lectures and links to popular articles on his work can be found at the professor's web page.

He also wrote a book titled Time Traveler: A Scientist's Personal Mission to Make Time Travel a Reality, co-written with New York Times best-selling author Bruce Henderson, that was published on October 28th, 2006.

And you can find his homepage Here.

Seems pretty interesting and a smart fellow, I'm sure we'll be hearing something when he actually starts the experiements (or we'll all get sucked into a man-made worm-hole...whichever comes first).

 

[Mr. Credible]

well, if someone did discover/invent time travel, we'd probably never know about it.... for all we'd know, yesterday, we could have all been lizard people, or something.

 

[mrsparkle]

I thought I heard somewhere that thoereticaly it was possible to go foward in time but no to go back. however its nothing like the movies, some kind of shuttle would have to orbit the earth, which to the astronaut would be about 5 years but upon landing 50 have passed.

I'll have to do some research and get back to you.

 

[Mr. Credible]

I thought I heard somewhere that thoereticaly it was possible to go foward in time but no to go back. however its nothing like the movies, some kind of shuttle would have to orbit the earth, which to the astronaut would be about 5 years but upon landing 50 have passed.

I'll have to do some research and get back to you.

i've read that, too.

i don't see how it's possible.

 

[Showtime]

where we're going, we don't need roads...

 

[Showtime]

Napolean Dynamite didn't need a flux capcitor to go back in time...