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Is time travel possible?
Posted by: McQ on Thursday, August 09, 2007

Yes says Prof Amos Ori, of the Technion-Israel Institute of Technology:
Bend time enough and you can create a loop and the possibility of temporal travel.

Prof Ori’s theory, set out in the prestigious science journal Physical Review, rests on 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.”

In the blends of space and time, or spacetime, in his equations, time would be able to curve back on itself, so that a person travelling around the loop might be able to go further back in time with each lap.
No says Stephen Hawking:
Prof Hawking then fought back with his Cambridge University colleague Michael Cassidy and they concluded that time loops are extremely unlikely.

Tongue in cheek, Prof Hawking added that there is experimental evidence that time travel doesn’t exist: “We have no reliable evidence of visitors from the future. (I’m discounting the conspiracy theory that UFOs are from the future and that the government knows and is covering it up. Its record of cover-ups is not that good.)”
Heh. Hawking's tongue-in-cheek point is, in fact, a fairly elegant refutation, but it could also indicate there may be no future to come back from for mankind, or, more specifically, maybe we never perfected time travel before, poof, we were gone. Wow ... now that's optimistic, isn't it?
 
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More proof of global warming. The Earth warms up and wipes out civilization in next 50 years.

 
Written By: Manbearpig
URL: http://
Actually, time travel to the future is not terribly problematic (from a physics point of view.) It is only time travel to the past that is.

The ideas of Dr. Ronald Mallett of UConn are a little more intriguing, and are NOT refuted by Hawking’s contentions. His argument is that you need to set up a machine to act as infrastructure to allows travel backwards in time. I assume that, were it to work, as soon as you switched it on time travellers could and would appear. But you couldn’t go back further in time than when the machine was created. Such a machine has not been made, therefore we shouldn’t expect to see time travellers yet.
 
Written By: Rich Horton
URL: http://www.iconicmidwest.blogspot.com
I bet Murtha wishes it were possible right now...

Another Marine has the charges dropped
 
Written By: Scott Jacobs
URL: http://
Well, the problem could be the future hasn’t happened yet, that is, this is the first time through. I think.
 
Written By: IB Bill
URL: http://industrialblog.powerblogs.com
Well, the problem could be the future hasn’t happened yet, that is, this is the first time through. I think.
To quote Miles O’Brien from Star Trek: Deep Space 9 "I hate temporal mechanics..."
 
Written By: Scott Jacobs
URL: http://
Well my Doppelganger from the future says that time travel IS possible and that human cloning isn’t all that bad...lotsa ANS’ in the future.

There is the Niven-Pournelle Theory of Time Travel...it goes somethin like that time travel IS possible, and it has and will be invented many times, BUT it causes such temporal confusion that ultimately what happens is the inventor of the time machine(s) is murdered and the rift is sealed. In short time travel is a self-healing problem.
 
Written By: Joe
URL: http://
I believe it was Scott Adams (of Dilbert) who said that the last invention humanity will create is holodeck-style virtual reality. Once that’s invented, no one will ever leave, or reproduce, and the species is doomed.

So the holodeck probably comes before the time machine, and the time machine never gets invented because the scientists are in the holodeck with virtual Jessica Albas.
 
Written By: kevin r
URL: http://
So the holodeck probably comes before the time machine, and the time machine never gets invented because the scientists are in the holodeck with virtual Jessica Albas.
You mean the Jane Mansfields....Pah, modern womyn, mere stick figures,
 
Written By: Joe
URL: http://
I’ll take Marilyn Monroe, thank you...

Or Nancy Grace...

*hangs his head in shame*

...

Don’t you judge me. I caught you checking out Pelosi. I’m the sick one?
 
Written By: Scott Jacobs
URL: http://
Well Bettie Paige or Dita Van Teese....Pelosi *Shudders* OMG NO...the Goggles they do nothing!
 
Written By: Joe
URL: http://
Honestly, I’d be very happy with a Mary Kathrine Hamm hologram...
 
Written By: Scott Jacobs
URL: http://
Honestly, I’d be very happy with a Mary Kathrine Hamm hologram...
Oh, you’re going to be jealous, Scott ... met MK at the Milbloggers Conf and she bought me a beer. And she looks even better in person, btw.
 
Written By: McQ
URL: http://www.qando.net/blog
You’re dead to me.
 
Written By: Scott Jacobs
URL: http://
No, I take that back...

What’s her left hand look like? Anything we should know about? ;)
 
Written By: Scott Jacobs
URL: http://
Well it has four fingers and an thumb and no that wasn’t where my attention was focused.
 
Written By: McQ
URL: http://www.qando.net/blog
Well it has four fingers and an thumb and no that wasn’t where my attention was focused.


Suffice to say that you are worthless as a forward observer. I’ll see you put on Latrine detail for this...
 
Written By: Scott Jacobs
URL: http://
damnit!

I’ll try that again...

———————
Well it has four fingers and an thumb and no that wasn’t where my attention was focused.
[withholds comment]

Suffice to say that you are worthless as a forward observer. I’ll see you put on Latrine detail for this...
 
Written By: Scott Jacobs
URL: http://
...or, more specifically, maybe we never perfected time travel before, poof, we were gone.
I can think of other possibilities.

Maybe we’ve been visited plenty of times, and that’s where the microwave oven, the transistor, and gunpowder came from. Plus the victory at Midway (which defies probability and looks like a Time Patrol operation to me). However, in that case, the visitors must have left no "imprint" that would be obvious to the rest of us concerning their involvement. Hypothesizing about what happened at Midway doesn’t prove that it was a Time Patrol operation.

Or, in the many-worlds hypothetical universe, each time traveler could launch a new universe whenever they go back in time. And we could be on the "pure" branch of the timeline that never received a visitor.

Now, given the probabilities involved (large, possibly uncountable, number of visitors coming back in time vs. only one "pure" branch), that’s not really plausible. But if many-worlds is correct, and time travel exists, there would be one such universe.
 
Written By: Billy Hollis
URL: http://
Actually, time travel to the future is not terribly problematic (from a physics point of view.)
Correct, and I can sell you such a time machine. Strangely enough, it looks like a easy chair. If you sit in it an hour, you are transported an hour into the future.
 
Written By: Billy Hollis
URL: http://
Actually it’s not a very good refutation at all.

From the article I read:
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."

But don’t pack your bags and get ready to go dinosaur-hunting yet. "We, however," he cautions, "could not return to previous ages because our predecessors did not create this infrastructure for us."
So if I understand this right, you couldn’t travel to any time before this thing/condition was built/made. So since it hasn’t been made yet, we wouldn’t see anyone from the future.
 
Written By: ChrisB
URL: http://
Its a moot point until FTL, anyhow. Imagine if you will...

You fall off your toilet and bump your head. Suddenly, you have the idea how to step outside of spacetime and re-enter in the past or future. Its the Fluxored Capacitor! So you set about creating it and installing it in a 2008 Dodge Charger. What, a Delorean? Thats so 80’s.

Anyhow, you climb into your time machine and set the clock back ten minutes ago. You step on the accelerator and get up to 88 MPH and....

You die in the vaccuum of space.

Because, even though you did manage to go back in time, you forgot that the earth is constantly moving in space. When you went back in time ten minutes, you ended up in space where the earth will be ten minutes later.

And so, as you choke on the last rivlets of blood that are boiling out of your tongue, the earth catches up to you and you burn up on reentry. Scientists spend the next hundred years trying to figure out how a Dodge ended up crashing through the roof of a home in Schenectety.
 
Written By: mcgurk
URL: http://youredoingitwrong.mee.nu
LMFAO

Priceless...
 
Written By: Scott Jacobs
URL: http://
That part is true, you would have to calculate space and time coordinates of your intended target. That was the implication behind the intro to Planet of the Apes (Heston’s Taylor didn’t figure he had moved so far in time, as to catch up with the Earth, almost 2,000 years; odd he had already 700 hundred
years before he went into hypersleep) The series adaptation of Time Cop also incorporated that element of fourth dimensional planning if nothing else. Frankly,Stephen should be considering going back to the time he decided to do the voice overs for the "Masters of Science Fiction’ series. First episode, a business executive discovers he has forgotten that as President, he started a pre-emptive war,(see if you’ve heard this one before that started nuclear winter; which he subsequently blocked out. Second episode, an army general officer orders an UFO to be shot down that is actually an angel in Iraq; check please
 
Written By: narciso
URL: http://
Mcgurk,

The earth’d never catch up both Dodge and planet would be moving at 29.78 km/s in orbit around the sun. Perhaps there are several successful fluxored capacitord vehicles orbiting ahead and behind us as we speak or more likely (!?!) moving away on non-orbital vectors at 88 mph.
 
Written By: unaha-closp
URL: http://
If you accept the plausibility of The Matrix, ie that one day machines will become so powerful they can create a convincing reality within which to contain a human consciousness for the duration of its life, then you must also accept that they will be able to create and sustain innumerable such realities, maybe entire universes for each individual. What then are the odds that we currently inhabit the REAL world, not some generated illusion, that we are not the pet of some mega-intelligent machine hyperbeing ?
 
Written By: blewyn
URL: http://

 
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