Is time travel possible??

[davidivad]

it is people like you that will make these things possible young man.

[Endercreeper01]

Thanks! We will need a very efficient energy source in order to get objects near light speed.

Circular motion would also work, if we has materials string enough to sustain the centripetal force of [latex]\gamma^3 \frac{mv^2}{r}[/latex].

Edited January 12, 2014 by Endercreeper01

[Lightmeow]

Time travel into the past is impossible. The positron is just something that behaves the opposite of the electron. It doesn't mean it is time travel into the past.

In special relativity, the equation for relative time is [latex]t=\tau \sqrt{1-\frac{v^2}{c^2}}[/latex]

We don't use the actual velocity, but we use the relative velocity. The relative velocity would be velocity respect to another observer. If the other observer had velocity u, and you had an actual velocity of v', your velocity relative to them and their velocity relative to you would be

[latex]v=\frac{v'+u}{1+\frac{v'u}{c^2}}[/latex]

The effects of special relativity only take effect at velocities comparable to the speed of light. At everyday velocities, the effects of special relativity are very small.

In gravitational fields, [latex]t=\tau \sqrt{1-\frac{R_s}{r}}[/latex] in a Schwarzschild space-time. The effects are negligible for everyday life, as we don't change our distance from the center of the earth very much.

Time travel is impossible in everyday circumstances.

 

How do you define time? Is it a formula, a point. Can you see a way using your formulas to warp it so it could be possible? Like some people say "the river of time". Is there a way we could get on the banks of the river[time] and walk up and down the banks, then plop ourselves back in?

[Endercreeper01]

One possible way would be to use a black hole. We would need to orbit around the black hole at a velocity of [latex]\sqrt{\frac{GM}{r - R_s}}[/latex]

We would also need to find the time dilation. Because it is in orbit, time would be dilated by a factor of [latex]\sqrt{1-\frac{3R_s}{2r}}[/latex].

Another way is to use circular motion. The only problem is that most substances will not be able to sustain the centripetal acceleration of [latex]\gamma ^3 \frac{mv^2}{r}[/latex] at relativistic speeds.

The only thing we need is enough energy for relativistic speeds, which will be a problem. The energy required to achieve relativistic speeds is [latex]mc^2\gamma - mc^2[/latex]. It will be very hard to find an energy source providing this much energy.

Edited January 12, 2014 by Endercreeper01

[Rajnish Kaushik]

it is people like you that will make these things possible young man.

i will try my best to prove you correct

One possible way would be to use a black hole. We would need to orbit around the black hole at a velocity of [latex]\sqrt{\frac{GM}{r - R_s}}[/latex]

We would also need to find the time dilation. Because it is in orbit, time would be dilated by a factor of [latex]\sqrt{1-\frac{3R_s}{2r}}[/latex].

Another way is to use circular motion. The only problem is that most substances will not be able to sustain the centripetal acceleration of [latex]\gamma ^3 \frac{mv^2}{r}[/latex] at relativistic speeds.

The only thing we need is enough energy for relativistic speeds, which will be a problem. The energy required to achieve relativistic speeds is [latex]mc^2\gamma - mc^2[/latex]. It will be very hard to find an energy source providing this much energy.

this was shown in discovery science i have seen this episode

[DimaMazin]

 

In special relativity, the equation for relative time is [latex]t=\tau \sqrt{1-\frac{v^2}{c^2}}[/latex]

.

t=tau / (1-v²/c²)^1/2

Edited January 13, 2014 by DimaMazin

[Endercreeper01]

t=tau / (1-v²/c²)^1/2

No.

http://hyperphysics.phy-astr.gsu.edu/hbase/relativ/gratim.html

That is the equation for proper time. If that was the relative time, time would go faster, not slower.

Edited January 14, 2014 by Endercreeper01

[DimaMazin]

No.

http://hyperphysics.phy-astr.gsu.edu/hbase/relativ/gratim.html

That is the equation for proper time. If that was the relative time, time would go faster, not slower.

The your link doesn't prove the your equation is correct.Where did you see the equation?

Edited January 14, 2014 by DimaMazin

[Endercreeper01]

You need to scroll down until you see it.

[DimaMazin]

You need to scroll down until you see it.

There is

T=T_{0 *} gamma

In my equation t=T and tau=T₀ gamma=1/(1-v²/c²)^1/2

Still I am right.

[Endercreeper01]

If [latex]t=\frac{\tau}{\sqrt{1-\frac{v^2}{c^2}}}[/latex], time would speed up as v approaches c, which it doesn't.

If T is proper time, your equation would be correct.

[DimaMazin]

Time travel into the past is impossible. The positron is just something that behaves the opposite of the electron. It doesn't mean it is time travel into the past.

In special relativity, the equation for relative time is [latex]t=\tau \sqrt{1-\frac{v^2}{c^2}}[/latex]

 

Here t < tau

 

 

In gravitational fields, [latex]t=\tau \sqrt{1-\frac{R_s}{r}}[/latex] in a Schwarzschild space-time. The effects are negligible for everyday life, as we don't change our distance from the center of the earth very much.

 

Here t < tau

I have confused. You are right.