Time travel 'may be possible', says new research

Physicists banish the 'grandparent paradox' with successful time-travel simulation

LAST UPDATED AT 13:42 ON Mon 23 Jun 2014

Physicists studying the behaviour of single particles of light say they can now discount one of the main theoretical objections to time travel.

During research published in Nature Communications, scientists at the University of Queensland designed an experiment that simulated the effect of a photon – a particle of light – travelling back in time and interacting with its older self.

"Time travel was simulated by using a second photon to play the part of the past incarnation of the time-travelling photon," said University of Queensland physics professor Tim Ralph.

The lead author of the paper, PhD student Martin Ringbauer, said the experiment aimed to examine the intersection of quantum mechanics and Einstein's theory of relativity.

"The question of time travel features at the interface between two of our most successful yet incompatible physical theories," Ringbauer said. "Einstein's general relativity and quantum mechanics."

Einstein's theory of relativity suggests that it may be feasible to travel backwards in time by following a "space-time path" that doubles back and returns to its own starting point in space, but at an earlier time, NDTV news reports. Physicists refer to such paths as closed time-like curves (CTCs).

Researchers ran two versions of the experiment. In the first version, they looked at what might happen when a photon "travels through a wormhole into the past, then interacts with its older version". In the second case, they wanted to investigate what might happen when a photon "travels through normal space-time, but interacts with another photon that is trapped inside a CTC forever".

"The results revealed that time travel on a quantum level seems to be possible," the Daily Mail reports.

Physicists and philosophers have long struggled with the grandparent paradox. As Science Alert explains, a time traveller could in theory prevent his or her grandparents from meeting, "thus preventing the time traveller’s birth". This would make it impossible for the time traveller to have set out in the first place and kept the grandparents apart.

The new research suggests that such paradoxes may not render time travel impossible, the Mail notes, "albeit only on a quantum level for now". · 

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I'm going to test out my time machine.
I'm setting it to go back 5 minutes.
See you when I get there!

There will never be time travel, because there is no such thing as time: There is only condition - and change. Time is an illusion in mind.


gold star

The answer is always; "kill Hitler"

Things exist; they have condition as matter. They can change condition (as when something rots away; or, when someone crafts a machine from component matter). But it doesn't take "time." It's just a change of condition. Change itself is a condition. This is original thinking on my part. Someone once said to me: 'But what about a clock, and it's register of time?' A clock is a machine, and it doesn't know it's a "clock." The movement of hands are just a condition, and change of condition. "Time" for us is just a way to pit one condition against another, for convenience: We go to bed when the sun goes down, usually, and we have machines (analog, digital, etc.) clocks that gauge when the condition of Earth vis-à-vis Sun is favorable, and we plan activities based on that, and other matters of calendaring and clocks. Planning itself is a condition - and any condition of yourself against plan (and plan's potential) is just another... condition.

Not according to basic physics. What you're suggesting is nothing but a bunch of philosophical nihilist tripe. Time exists, and not just as a theoretical construct.

You've provided no reasoning for your position: It is yours that is tripe. As to basic physics, physics is the antithesis of "time" (in quotes, as it doesn't exist except as a convenience of mind). Keep the discussion on a civil plain.

Hello DogBoy;

Your post would have been funnier if you posted the "IT WORKS" first, and THEN the "I'm going to..."


Are you serious? Congratulations, you might just be the biggest idiot I've ever had the pleasure of conversing with. No, time is not just a construct. It can be affected by gravitational lensing. Clocks on the space station run faster than they do down here on earth, no matter how accurate the mechanism. If you're in one location one moment, and in another in another, I suppose that's just an elaborate deception fabricated by your mind, too, eh? Wow, deep thinker, I think you need to go back to the drawing board. Maybe start by staying awake through an entire documentary film?

Hmmm... you derive pleasure from talking with idiots? I think that, and your insulting nature, belies who the idiot may be. As to clocks running faster on a space station - means nothing - just another condition of a machine (the clock) suffering an impact to its workings by virtue of environment. I can put a clock underwater and make it stop. I guess I stopped time, huh? You have me laughing, and I like to laugh... so, thanks! If you want to have an intelligent conversation, debate, whatever, try being civil.

*Facepalm* You clearly didn't read what I wrote. The clock mechanism doesn't matter. The "relativity" in Special Relativity is time. I wasn't kidding when I said this was basic physics. What I've explained is what e=mc^2 means. This is all proven science, with hard math and real experiments behind it. The truth is, I'm a little embarrassed for you, having spoken on a subject you've obviously given a lot of thought but very little actual research. Clearly, I overreacted, but what you've suggested shows a very conceited worldview-to the point where it's a little offensive. To share an unresearched opinion in attempt to refute a scientific article smacks of extreme arrogance, and makes you look foolish.

"It is better to keep your mouth closed and let people think you are a fool than to open it and remove all doubt." -- Mark Twain

I'm familiar with the Twain quote; one of my favorites. It's good to know you have self-awareness: "Clearly, I overreacted..." - you'll note that I am civil, and take genuine interest and pleasure in examining these sorts of things, and remain mature and reasoned (non-emotional; there are far better things to get emotional about).. As you say, "The clock mechanism doesn't matter." Indeed; the clock doesn't know it's a clock - it's a machine, and only our proactive assignation of numbers and our willful interpretation of them makes it a clock - in our minds. There remains only 1) Condition, and 2) Change. There is no Time... and Time Travel cannot be possible.

Wow. You claim to remain mature, and reasoned, yet you don't listen to reason. Time runs slower outside of a gravity well. It's proven fact. It's one of the basic facts of the universe. Yes, hours and minutes are constructs, but time itself is immutable fact. This isn't a personal opinion. Einstein himself had a theoretical idea for a time machine. It would require obscene amounts of matter to construct, but it's possible. You have probably stepped into a slightly higher gravity well within your lifetime, and experienced a minuscule form of time travel without realizing it. Astronauts come back to earth slightly younger than they would have had they remained on earth. I don't know what else to say. I could post countless websites explaining Relativity to you, but somehow I don't think you'd quite understand. Time is a physical reality. You aren't a time-traveling Shakespearean Touchstone by any chance, are you?

Don't let it get to you Jeremiah - plenty of other things to worry about.

I don't understand people like you, that's all. How on earth can you be satisfied with such a limited pool of knowledge, and not be eager to fill your brain with as much as it can contain? I'm often called arrogant, because I often inform people when they're mistaken, and yet people like you exist everywhere, spouting off uninformed opinions as if they were fact. If that's not the epitome of arrogance, how can you stand knowing there's so much you don't know? I can't stand it, myself, and I spend a great deal of my time trying to fill those gaps. I worry, because I see you as a microcosm of the deteriorating human condition. I wonder: can man be taught to love learning again? Is this arrogant ignorance cultural? Is it a recent affectation? Or are there genuinely different classes of civilization, and people like you really belong in the proletariat? That last one is really terrifying. I hope it's wrong. If it is, it means you've only been conditioned to be the way you are, and might one day learn to change. If not, I fear I may one day be looking into the government's mirror, preparing to be fitted with a rat cage.

I guess I must know something. I published a book, "I.T. WARS", that became an MBA-text used by 40 universities. It's still on Amazon, ranked at around a million and a half; it came out in '07. Helped me buy a nice house for cash. I guess I know a smattering of something. IT is very empirical, and requires a great deal of knowledge, especially at the level at which I practice. It's a discipline of mind that allows me to examine and realize all sorts of things. You'd probably find interest in the last chapter, "What's At Stake", which examines the threat of EMP.

And yet you know nothing about time or physics. And apparently had no interest in researching the field, preferring your own pontifications to reality. Why is that? Has your success in one field blinded you to your ignorance in others? I'm genuinely curious as to what your affliction is.

What people really don't realize about travel is that there really doesn't exist a fourth dimension. A dimension is something that describes a specific wave function that are believed to divide existing hidden doorways in the universes structure that act simultaneous as a whole function of what we call reality. So the question is asked Is there really a fourth dimension? Is light speed a universal speed limit for earth or does life goes on? The answer to this divine question is 'Life goes on of course'. What seems to happen may not really happen at all.
In the illustration A ship travels faster than light and observes things reversing backwards back into the past that it originated from like watching a clock run backwards or the origin of reality a its pathway it traveled from minutes before hand . But is that really what's going on? Is the universe of what's known as the fourth dimension really a dimension at all? What the captain sees in the ship traveling at time travel coordinates is reality passing up from itself. Or what Einstein's believes happens at that time. But in reality it doesn't happen that way at all. Your traveling so fast you can’t observe the scene anyways you can’t slow it down or speed it up what you will see if you could is momentum vibrating into shorter moment wavelengths of time that keep shortening more and more until reality reaches a point where it seems in the observation as though time has stopped. It will seem to stop but it doesn't - time just gets shorter and shorter and shorter as velocity in the ship gets faster and faster. The view Einstein illustrates as time traveling is just a description of the arrow of time running backwards. He explains it this way because 'light' seemed to him as a universal speed limit because it touches everything as being a special limit that can be directed for momentum and mass.(reality) The facts are - is that for time travel to happen as Einstein describes time stops. The ship is traveling at a velocity that it enters a new reality of time and space called a dimension and acts as a pathway between the past and the present. Directed by the description Einstein illustrates a time limit between the past and the present by means through velocity traveled in a spacecraft. But what he is observing is a physical illusion of what might be that happens if the speed of light were a speed limit - and the pathway by which it would continue if it were so. So a new question arrives. Does the universe really stop at light speed and does reality really assume back into the past? And is there really a dimension that will take you there? The answer is No. A wormhole takes you to a dead end because the space fabric tension projectiling the planets round upon won't allow passage through it. Space acts as a surface grid which not even planets or galaxies are allowed passage. Secondly, time is a human developed measuring techique for mathematics to measure a specific length using time for an equation. There exist no doorway back into the past. Spacetime as Einstein describes is a directive in a mathematical measurement that if placed on paper makes the universe past, present and future simultaneous. The passage through 'spacetime' does not take you through TIME itself at least not backwards into the past. The fastest pathway to china is straight through the earths core to the other side (the shortest distance) allowed to travel at the fastest time it takes to get there but it does not make the path a fourth dimension of space and time. Space and time are exactly that space and time. They do not entangle together to form a path in reality a reality that has sat for the universe for billions of years. Taking that shortest root to somewhere does not make that root a new dimension it only makes it that fastest root to the place of travel. Time travel in this respect means a passage through reality (matter/mass) from an out of the way manner and make reality intervene backwards or forwards and changing the universe's direction just for you the pilot of the ship even if it only means using just one of the planets time cycle like earths in relativity. It means devising a devise that changes the direction of (not time but reality (matter/mass) materialism that will allow you to pass through the realm (the universe) in a different direction of passage that already is permanent and exist in the structure of the universe is already. It means changing the way the material universe works and I don't think that is really possible. Time might be able to be used as a coordinates for such a thing but making it reality is beyond this day and age. Imagine viewing a passage way that allows to observe reality (atoms) and such structured passing backwards instead of forwards at a specific momentum. A vehicle for such a journey would have to be part of the realm and it doesn't seem to me that that is a passage of a new dimension. Does it you? Things vibrate towards a specific direction and obtain a specific result because of it. This I don't think can actually be even temporarily changed for even just a second of time. Traveling from place to place in everyday life is just that and the coordinates of time it takes for the ride is predetermined by reality and to be able to travel through this predetermined cosmic clock (or atomic clock which one) is really fast. This doesn’t mean that time travel isn’t possible. It only puts a lid of facts about the speed of light.
By: Rodney Kawecki 2014.07.07 yr.

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