I have a question about quantum physics?

Question

If a person travelled faster than the speed of lihgt and went fast enough would they eventually go back in time??

Answer 1

it would depend on which direction they were travelling

Answer 2

quantum physics,trying to prove that which we have no experience or visible proof of by conjecture.Tell me i,m wrong possum,we are stumbling along on the brink of realization ,proof and acceptance all the time.I n nature,given the right circumstances, anything is possible,nothing can be disproved if you cannot first prove it.Take the various religious arguments for instance,you cannot accept things verbatim.We are just beginning to see how the neutrinos function as they pass through us and the Earth on their journey to where we do not know.

Answer 3

No

At the speed of light, relative to a stationary observer, time would seem to stop.

You can not go faster than light, it is the fastest speed there is!

Answer 4

Well some say you would have to travel faster than the speed of light.

Einstein proved nothing can travel faster than light.

If something reached near the speed of light its mass would increase exponentially, making it difficult to accelerate.

If it were possible, 'they'd already be here'.

Answer 5

this isnt quantum mechanics, this is special relativity. funny that you should mix them up, because they are exact opposites.

as something accelerates, time slows down for it relative to something else. so someone not traveling that fast sees time slow down for that object. at light speed, time stops. so logically, at faster than light speeds time would reverse.

Answer 6

time travel is impossible no matter how fast you travel you would not arrive at a past date  

Answer 7

No. Time isn't a thing you travel through. It isn't some substance.

Answer 8

a person cannot go FASTER than the speed of light.

as a person accelerates toward the speed of light, time seems to slow for them. at the point where they reached the speed of light, time would completely stop for them, and they could accelerate no faster.

Answer 9

It is still uncharted water.  

Answer 10

Einstein declares in (his widely-accepted, though deeply-flawed (ssshh don't tell them about the errors!)(oh, sorry, I forgot) his works on relativity, that a physical object is unable to reach the speed of light.  For all but a handful of weird tiny, tiny, tiny objects, this seems to be true.  Indeed, at a close approach to the speed of light, weird stuff happens to the object we accelerate!  As we pour more energy into it to make it go faster, it actually increases in mass!  It also gets shorter in length.  Thing is, mass = a super-concentrate of energy, and therefore, energy = a super-dilution of mass.  An atomic bomb works by converting just a tiny amount (about a golf-ball) of matter into pure energy, and look what happens there.

Answer 11

you're asking the wrong person here!

Answer 12

Not uh.

The speed of light and the speed of time aren't entirely running on parrallel levels.. so if you were to travel faster than light, or fast enough.. i don't believe it'd be possible to hop time.

ah, look at this actually.

when you slow time down.

you get a fraction of what man measures time to be.

when yuo slow even that down. you get even furthur of a fraction.

everything in existance is a slow vibration in it's own way.

how far can you slow time down to the point that all vibration stops and time has yet to matter. in the sense that nothing would exist.

in that form, does time exist anyways?

or do we even exist?

i have a whole theory on that but it's too long.

but yes.

the concept of time wouldn't have means of being jumped or traveled through in means of speed really.

Answer 13

well , firstly it is not possible to travel at speed greater than that of light.

however if u take it in that way, then i think that yes u would be going into the time at slow pace. so you actually will find urself in a time frame much earlier than what u should normally have been.   But u can't go back into history.

Answer 14

you cannot travel faster then the speed of light

Answer 15

The flaw in your question is not only that nothing can travel faster than the speed of light, but nothing can travel backwards or forwards in time. We can only make the time go faster or slower, and only in relation to another frame of reference. Time is not a dimension along which you can travel (that's why I prefer not to call time the 4th dimension, it's misleading).

Answer 16

Quantum physics doesn't deal well with anything as large as a "person," so you'd have to use a different physical theory (relativity) to approach an answer.

And according to relativity, the answer is "no."  Relativity puts a speed limit on how fast a physical object can travel through space, so you cannot travel faster than light.

The answer to "what if you _could_" go faster than light, is not addressed by relativity.  You can't use the equations of relativity to tell whether you'd go forward, backward or sideways in time at those speeds, because the equations don't work at those speeds.

So, in order to address the "what if" question properly, you'd have to make up a whole new theory, which hasn't been done yet.  Until then, it's pure speculation.

Answer 17

Time travel possibilities are normally addressed using General Relativity rather than quantum mechanics. Furthermore, according to current, conventional, theoretical physics - time travel into the past is impossible. I'll try to explain!

Einstein published his Theory of General Relativity in 1915 but it was not until the late nineteen forties that, the Austrian mathematician, Kurt Godel found a time travel possibility within a solution to some relativistic equations. He found, that if the universe is rotating then time travel in both directions should be possible. By both directions, I mean, into the past and back or into the future and back. Alas, recent observational work used to study the cosmic back-ground radiation has indicated that the universe has not rotated significantly since its creation. Hence, time travel into the past would appear to be impossible.

However, Einstein's theory of Special Relativity allows 'time-dilated' travel into the future. If an astronaut sets off on a journey travelling at a high percentage of the speed of light, then his on board clock will run more slowly than an equivalent clock here on Earth. Thus, when the high speed traveller returns after a few years of his elapsed time; here on Earth many hundreds of years may have elapsed. The time dilation equation is given below: -

t(Earth) = t(traveller)

..............._________

...............√(1 - (v/c)²)

Where 'c' is the speed of light and 'v' the traveller's velocity, which may be expressed as a percentage of the speed of light ((say) 0.99999c).

There also exists an oddity called a ‘Kerr metric’. Within the ergo-sphere (an elliptical region just outside of the spherical event horizon) of a rotating Black Hole, a traveller would travel through closed time loops as they were dragged along by the angular momentum of the hole. This metric is a measure of how space-like coordinates become time-like in a region of dragged rotating space-time! However, closed time-like loops do not permit retrograde time travel and, furthermore, it is impossible to escape from the ergo-sphere of a rotating Black Hole.

So, to summarise, the answer appears to be that you cannot travel through time into the past but you can travel into the future - at least theoretically!

Answer 18

As far as we know is it hopeless to try to move faster than light. No physical body or wave has been observed in speed higher than speed of light.

For fun you can play with the idea and try to calculate the time spent in such a journey.

On the earth we will count the time passed with our watches.

My you will be younger than we expect when you come back because of the enormous gravitation you have lived in. 10000000000000 g I guess.

According to Einsteins general theory any physical or chemical process goes slower in big gravitation.

I do not think you need such a journey.