I went to a lecture on Saturday on Time Travel with the speaker as Nobel Laureate Anthony J. Leggett. I didn't quite understand his British accent. But can time travel backwards? I wonder if it's possible...
2006-10-08 16:28:06 · 9 answers · asked by iceui2 2 in Science & Mathematics ➔ Physics
I don't think anti-time is possible in this universe.
Time can slow down around dense masses like black holes, because these dense masses curve space so much time actually does slow down. This is known as dilation of time.
If we could travel faster than light, time would also slow down.
But think about this: if a time machine is invented in the future, wouldn't it already have come to the past and then it would always have existed...
Ma be in another universe with 4d space, where people can go in two directions at the same time, anti-time travel could be possible, but that's just a far fetched tough.
What is time as we know it and as we measure it
Time> 1/f=t
Time is a movement of space, in one direction, the inflation of the universe.
You should try reading Steven Hawkins's: A brief History Of Time.
Its very interesting, he talks about anti-time, but don't forget anti-time is imaginary time.
Also think about this: before going back in time, time itself would have to slow down, then come to a stop before reversing...
How long would that stop last? (if time has stopped, how can you measure it?)
I hope it helped.
2006-10-08 16:43:28 · answer #1 · answered by Yahoo! 5 · 1⤊ 0⤋
It would be incorrect to think of time as flowing past us. This is the same as the idea that the sun goes around the earth. This is an egocentric viewpoint.
Time is an action in a dimension the same as motion is an action in the spatial dimension. Our perception of time is our movement in the time dimension.
All things in the universe exist at only one point in the spatial dimension and one point in the time dimension at any given instant. The difference between the spatial dimension and the time dimension is that we may have zero movement in the spatial dimension but our transition in the time dimension is always moving at a constant rate.
Our position at any given instant is called the present. You may move in any direction in the time dimension if you have some way to apply a force to change you transition in time. You would just leave the present and go to a point in the time dimension where the universe had been.
Going backward and forward in time is the same as trying to state that some spatial direction is forward and another is backward. If you are moving you may only go back to where you had been.
2006-10-09 03:47:52 · answer #2 · answered by Tlocity 3 · 0⤊ 0⤋
There are things that are possible but only on a very, very small scale. For example, can anything travel faster than light in a vacuum? It's possible. I've read about light passing through a solid transparent medium transferring its information to the other side of the medium before light could have passed over the same distance. But these are things that occur on only a very small scale. This makes them highly interesting and potentially very useful, but you won't be able to take today's race results and place a bet yesterday.
2006-10-08 23:47:25 · answer #3 · answered by Anonymous · 0⤊ 0⤋
in order to understand completely the possibility of such a thing happening is to realize that every event is influenced and influences time and sapce domain. the only chance of a negative time vector is by the collapsing of the universe and is condenasation to its originala state. at which space will shrink and it will "draw" time on it us well. as time defined and space and vice versa vectors of both quantities came to co-exsist. is there a -100m^2 area. ??
no
till it exsists we will not witness the -2sec either.
on the other hand if some thing goes wrong with thermodynamics that i seriously doubt it to find s "space" that decreases its entropy. it is said that if you draw 2 pictures of the exact place without anything changes the only way to know the one draw first is to examine entropy. since it is increased the ony with less entropy is drawned first.
therefrore is in a space entropy starts to decrease (impossible) then we will be witnessing something like negative time .
2006-10-09 01:10:44 · answer #4 · answered by Emmanuel P 3 · 0⤊ 0⤋
Time is a human notion : we think everything has a beginning and end . Time doesnt exist in the infinite small .. . We see the space through our human eyes . the truth is not our eyes . To go backward in time use your imagination ..
2006-10-08 23:48:08 · answer #5 · answered by Astarte 2 · 3⤊ 0⤋
Not in this universe, but... in science fiction it has been postulated that if parallel universes exist, some may have time's arrow pointed the opposite direction, or their "rates" of time's passage might differ from our universe (faster or slower).
2006-10-08 23:46:18 · answer #6 · answered by Nesbitt 2 · 0⤊ 0⤋
on an episode of star trek the next generation,
there was this theory of anti-time.
that it does indeed run backward.
2006-10-08 23:30:29 · answer #7 · answered by Anonymous · 0⤊ 0⤋
Not realistically it can't. Maybe in your imagination.
2006-10-08 23:30:43 · answer #8 · answered by Anonymous · 0⤊ 0⤋
Yes... in some stopwatches it does :)
2006-10-08 23:31:29 · answer #9 · answered by faztboz 2 · 0⤊ 0⤋