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Old 08-23-2010, 11:54 PM #1
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Default Time Travel

Is time travel possible? I want to hear everyone's insight on this.

I was watching through the wormhole yesterday and there was this guy that was actully able to send a message back in time, it may have only been a few microseconds back but still... And they used a laser .

When traveling back in time we run into paradoxes. An example of a paradox would be if I when back in time and killed my grandpa would I exist anymore, would I even exist to the point where I never invented the time machine to kill my grandpa. .
Ok I'm sure some of you have heard of parallel universes, there may be an infinite number of them some physicists predict. Some believe that to be able to avoid paradoxes when going back in time or sending messages back in time that we would go back in time to a parallel universe similar to our where we can kill a grandpa and get away with it.

The events of the future influence the events of the past.


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Old 08-24-2010, 07:51 AM #2
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Default Re: Time Travel

Quote:
Originally Posted by Tux View Post
Is time travel possible? I want to hear everyone's insight on this.

I was watching through the wormhole yesterday and there was this guy that was actully able to send a message back in time, it may have only been a few microseconds back but still... And they used a laser .

When traveling back in time we run into paradoxes. An example of a paradox would be if I when back in time and killed my grandpa would I exist anymore, would I even exist to the point where I never invented the time machine to kill my grandpa. .
Ok I'm sure some of you have heard of parallel universes, there may be an infinite number of them some physicists predict. Some believe that to be able to avoid paradoxes when going back in time or sending messages back in time that we would go back in time to a parallel universe similar to our where we can kill a grandpa and get away with it.

The events of the future influence the events of the past.
If I remember correctly with the study of using lasers to send stuff back in time you cant send anything back further than the point when you started the experiment. So no killing your grandfather but your grandchildren could come back and kill you.
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Old 08-24-2010, 03:41 PM #3
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Default Re: Time Travel

Attach a mirror to a motor to make the time tunnel. This is necessary part of time machine.
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Old 08-24-2010, 05:48 PM #4
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Default Re: Time Travel

Quote:
Is time travel possible?
Yes ..... when you get your money from your work, and when you arrive home you realize that the money passed from your pocket in your wife's hands BEFORE you even noticed it ..... this is a practical example .....

(j/k )
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Old 08-24-2010, 07:49 PM #5
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Default Re: Time Travel

While HIMNL9's description is of matter teleportation, they are essentially the same thing. Moving matter through space instantly is much akin to traveling faster than light within a single "universe plane." This same faster-than-light travel is required for time travel
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Old 08-24-2010, 08:43 PM #6
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Default Re: Time Travel

Quote:
Originally Posted by BShanahan14rulz View Post
While HIMNL9's description is of matter teleportation, they are essentially the same thing. Moving matter through space instantly is much akin to traveling faster than light within a single "universe plane." This same faster-than-light travel is required for time travel
To travel faster than light you would need to warp or tear space and since space and time are interconnected you would undoubtedly run into issues with time as well.

An idea of faster-than-light travel is that it could be accomplished by compressing the space in front of you and stretching out the space behind you to move from one point to another. But when you warp space you could move from one point in time to another as well.
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Old 08-26-2010, 04:21 PM #7
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Default Re: Time Travel

Traveling to the future is just a fact in particle accelerators, if you can travel very near the speed of light, your appear slowed down for the people that keeps static. Some particles that typically disintegrates in nanosecs, turn to live 10 or more times at near speed of light. However the energy amount required to achieve this speed for a macroscopic 1gram of matter turns astronomically high. So, possible but unprobable.

Travel on time to the past is also teoretically possible at small nanoscopic scale, but IIRC using just photons inside a laser cavity, so again no chance for macroscopic bodies. But there is another chance to travel to the past, if the wormholes really exist this phenomena could connect this point in spacetime to, lets say, the andromeda nebula at 2.5 million light years, then if you cross this hypothetical gate to andromeda in just a couple seconds, you are not relly traveling fast than the speed of light just at your normal speed through the wormhole, but you are also traveling 2.5 million years to the past of andromeda!

The only thing that we know that could bend spacetime like that is a black hole, inside it matter leaves existence in the universe leaving behind it the singularity which is just a spacetime break. It if perfectly possible to travel along this singularity, matter does this all day in millions of blackholes through the entire universe. But, it is no possible for people nor laser pointers to keep them alive at the end of this travel wherever it takes you due to the funny "*********fication" phenomena that tends to yield anything like an miles long *********.

However if we are talking about time travels, blackholes are the only things that bends the spacetime to the point where this type of travels could be possible, among other exotic things like an almost infinite energy source...

Lastly, the multiple universe theory which are several levels, scientist talk about things they can "touch", ie: no equation for God. Here we have to deal with Theory vs Fact. The fact is the Heisenberg's Uncertainty principle, again at nanoscopic scales, tells us that we can't know the speed/position of a (ie) an electron at the same time. It is like particles has a "blurry existence". Don't want to go deep in this but normally extrapolate this kind of facts that work at its proper nanoscopic space, into a macroscopic one is not a good practice. This blurry existence had been interpreted like there is lot of spaces where particles are in several positions all of them living together until a choice is made. This is true for particles, but not for people nor marbles, whose existence is much less "blurry"

Sorry for the brick

edit: spelling
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Old 08-26-2010, 04:54 PM #8
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Talking Re: Time Travel

Well, concretely speaking, you can (actually at least) only efficently travel to the future (and no need to do a long run on a spaceship near the light speed, too ) ..... get cryo hybernation (or any other life-suspending system that gives enough possibility to be reversed ) for the time that you want to travel, and, voila', you've traveled in time ..... cause after all, when (if) you wake up, no time is passed for you, so, technically this IS time travel (there is no subjective difference, traveling to the future, if you do it instantly, or if you just remain sleeping in life-suspended state for all the time, after all )
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Old 08-26-2010, 05:31 PM #9
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Default Re: Time Travel

I am a time traveler once a day, from many years ago.
but only short travels from like 0:00AM to 9:00AM LOL

1. Death is NOT time travel since you can't wake up from it, at least I don't know anybody who has done it yet.
2. Being hit by a rock in the head may or may not be a time travel, (see point 1).
3. Nightmares are time travel and intra-universe travel since you can go there, do your things, and get back. Exceptions have to be taken with Freddy Kroeger (See point 1).
4. Take a ear at some politicians speech is time travel cause they always make you believe you are in the future, but at the end of the speech you can return to the present. Exceptions have to be taken with terrorists (see point 1).
5. Time travels has been prohibitted in this universe by Chuck Norris to avoid people to go back in the past and defeat him when he was a baby.
6. Looking yourself at the mirror is time travel. you always keep wondering how can you be in the future so fast.

LOL
Sorry, bad jokes, I know... anyhow I could'n resist. just to put a funny twist
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Old 08-26-2010, 06:12 PM #10
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Default Re: Time Travel

There is some math/physics that hint there may be no such thing as time at all. And everything just exists in one "long now" where matter and energy are free to move and interact and entropy to increase in accordance with the laws of thermodynamics.

It's not inconsistent with the "time effects" of special or general relativity either. It's simply the interaction rate and entropy increase of energy/matter slows down or speeds up depending on your reference frame and relative motion.

The usual analogy to represent time dilation at relativistic speeds is the bouncing ping pong ball on a flat-bed train. Both standing still, the ball on the train and yours at the station bounce once a second traversing a 1 meter line up and down per bounce. When the train passes you at 100kmh, the ball on the train appears to you standing 'still' at the station to bounce in a long 6 meter arc, while to the person on the train, the ball still seems to bounce "normally".

If there is no such thing as "time", then Relativity still holds true, because time isn't being dragged out, just how that ball is bouncing is.

Keep in mind there is no such thing as an instrument that can detect or measure time. Every "clock" made really just measures the unwinding of springs, or the wiggling of electrons, or vibrations of atoms that are only presumed to happen in time.

So forward "time travel" is possible at relativistic speeds where your entropy processes on your ship appear to slow down as opposed to "stationary" observers, creating a discrepancy in your "future" as measured by your clocks, but backward time travel may not be possible because the past does not exist. The "past" might just be previous states of matter and energy, and "time" is an illusion our brains make to make sense of it.
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Old 08-26-2010, 06:23 PM #11
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Talking Re: Time Travel

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Originally Posted by magonegro View Post
5. Time travels has been prohibitted in this universe by Chuck Norris to avoid people to go back in the past and defeat him when he was a baby.
Sorry, but this point is wrong ..... Chuck Norris was not born, nor been a baby, you don't know ?

There are two versions, scientific one, and religious one .....

Religious one: in the beginning there was Chuck and God, and cause God was poor and had nothing to play with, Chuck lend him his "mecano" constructions set for 6 days .....

Scentific one: in the beginning there was Chuck Norris, but he was bored. all alone in the void, so one day he roundhouse-kicked the void and caused the big bang .....

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Old 08-26-2010, 08:56 PM #12
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Default Re: Time Travel

Quote:
Chuck Norris once walked down the street with an erection. There we no survivors.
I put instant coffee into a microwave and allmost went back in time.

Yes its possible.
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Old 08-29-2010, 03:54 AM #13
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Default Re: Time Travel

AJ_Dual explained time perfectly. That cleared the air a bit for me.
Quote:
So forward "time travel" is possible at relativistic speeds where your entropy processes on your ship appear to slow down as opposed to "stationary" observers, creating a discrepancy in your "future" as measured by your clocks, but backward time travel may not be possible because the past does not exist. The "past" might just be previous states of matter and energy, and "time" is an illusion our brains make to make sense of it.
This is very interesting, but I believe that all this information of previous states of matter and energy are stored somewhere (besides our brains), whether it be inside individual atoms or at the edge of the universe. If we can split through our space and time who knows what we can do.

So far traveling forward in time seems more theoretical possible. So here is another question we should be asking, what is the future? Can we predict it?
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Old 08-29-2010, 08:21 AM #14
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Default Re: Time Travel

I posted an interesting article on this forum about time travel next month.

Keep an eye out for it.
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Old 08-29-2010, 05:41 PM #15
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Default Re: Time Travel

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I posted an interesting article on this forum about time travel next month.

Keep an eye out for it.

Iv'e allready read it tomorrow.

EDIT...cant even get a drink!!111!!
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Various 532n nm 15mw pens ~ 600mW monster
515nm 34mW Direct Green Diode - LaserBtB
Various 650's - 1mW pens upto 300mW C6's

Last edited by ped; 08-29-2010 at 05:48 PM.
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Old 08-29-2010, 06:06 PM #16
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