Contrary to popular belief, one way time machines exist.

[anonymus]

It is commonly believed that time is a uniform entity throughout the universe. Newtonian mechanics is based on the paradigm that time is same for whole of universe and moves at a constant speed in forward direction, one of the entrenched belief that was proved wrong by Einstein in his seminal paper on special relativity which was so controversial for it's time that he was not awarded for his work on relativity.

The story begins with the curious situation that came to fore by the incompatibility of Maxwell law of electromagnetism and Newton's law of mechanics. There was an effort to bridge this gap by proposing ether theory which hold sway for close to a century before being proved wrong by Michelson–Morley experiment. The idea behind ether theory was that earth like any other celestial body was moving in an ether medium, a medium which help light waves to propagate like water allows transverse mechanical waves to propagate. The falsifiable aspect of this theory was that , if ether existed it would cause difference vis-a-vis speed of light when measured from different directions. This aspect was tested and proved wrong by Michelson–Morley in his experiment. Work over coming decades would lead to substantial revision of Newtonian mechanics which come to be known as Lorenz transformations of Galilian equation of motion.

And here comes the contribution of Einstein. Even though Lorenz transformations have existed for sometime, they were not given much importance as their theoretical underpinning was weak.They could not explain the results that they gave by application of mathematics.Einstein provided a theoretical framework and above all had a revolutionizing impact as it uprooted the very paradigm that time is same for every point in universe.For this he gave forth two postulates

1. The laws of physics are the same in all inertial frames of reference
2. The speed of light in free space has the same value c in all inertial frames of reference.

The results of Einstein theory of relativity were tested in an experiment conducted using atomic clocks over Chesapeake bay and were found to be true.

The basic derivation that explains the time dilation concept is as follows.

Imagine a large array of clocks on all three dimensions with you standing at origin. The time in your clock is 0:00. Now you want to synchronize all clocks wrt to your position so you emit a light signal in all directions. The observer at some clock receives the signal and since light signal can't travel at infinite speed, he adds the time that light has taken to travel to his station to get a proper value of time at his co-ordinate.

Now conduct a small experiment.

Imagine you are in a train moving forward with a velocity u. You conduct an experiment in which a photon is emitted by a photon emitter (whatever) and it goes up till a mirror after which it is reflected back. The height is h


now since photon travel at speed of light, time as measured by someone inside the train t' is 2h/c.

Now consider an observer who is standing on stationary platform.

To him the photon would appear to travel in a triangular path. let the total distance travelled by train during this whole event is 2l and the time measured by a fellow on ground be t.

so 2l= u.t

also by Pythagoras theorem, distance travelled by photon wrt to an stationary observer is 2.[ l[SUP]2[/SUP] + h[SUP]2[/SUP]][SUP]1/2[/SUP]

Also since speed of light is constant, distance travelled by photon would be c.t

putting the values of l and h in equation 1 and equating both equations we get

ct = 2 [ (ut/2)[SUP]2[/SUP] + (ct'/2)[SUP]2[/SUP]][SUP]1/2[/SUP]

c[SUP]2[/SUP]t[SUP]2[/SUP]= u[SUP]2[/SUP]t[SUP]2[/SUP] + c[SUP]2[/SUP]t'[SUP]2[/SUP]

t[SUP]2[/SUP]( 1- v[SUP]2[/SUP]/c[SUP]2[/SUP])= t'[SUP]2[/SUP]

t= t' / ( 1 - v[SUP]2[/SUP]/c[SUP]2[/SUP])[SUP]1/2[/SUP]


Above derivation is one of the easiest one of theory of relativity and gives some curious results

Suppose you hop in an space craft travelling at 99.8% of the speed of light ant take a tour on 10 years and then decide to return to earth retracing your path.Though only 20 years have passed on your spaceship,but how many years have passed on earth? Calculations show that 488 years would have passed on the earth during same time.

And this is not a fluke mind experiment. Time dilation is observed in atomic clock whenever they are moved from one point to another and also on GPS satellited which are nothing but miniaturized atomic clocks.

There is and another method of time travel. Parking yourself next to event horizon of a black hole after finding one massive enough to rip you apart by gravity waves. due to time and space being weaved together, time itself stops at even horizon of black hole.and if are able to return back to earth in future you would find that everything on earth has aged more than you.

 

[Chinese-Dragon]

Above derivation is one of the easiest one of theory of relativity and gives some curious results

Suppose you hop in an space craft travelling at 99.8% of the speed of light ant take a tour on 10 years and then decide to return to earth retracing your path.Though only 20 years have passed on your spaceship,but how many years have passed on earth? Calculations show that 488 years would have passed on the earth during same time.

And this is not a fluke mind experiment. Time dilation is observed in atomic clock whenever they are moved from one point to another and also on GPS satellited which are nothing but miniaturized atomic clocks.

There is and another method of time travel. Parking yourself next to event horizon of a black hole after finding one massive enough to rip you apart by gravity waves. due to time and space being weaved together, time itself stops at even horizon of black hole.and if are able to return back to earth in future you would find that everything on earth has aged more than you.

Yep, it has already been proved a while ago that speed (relative velocity) and gravity can cause "Time Dilation". Because time and space are relative.

They put atomic clocks on planes and flew around the Earth in 1971 to confirm it.

The problem is that we don't have the technology to travel anywhere close to the speed of light, and we don't have the technology to withstand extreme gravity, on say a neutron star or near an event horizon.

So the amount of Time Dilation we can practically achieve is very low, something like a fraction of a second. Not much use at the moment, apart from performing calculations.

 

[anonymus]

Yep, it has already been proved a while ago that speed (relative velocity) and gravity can cause "Time Dilation". Because time and space are relative.

They put atomic clocks on planes and flew around the Earth in 1971 to confirm it.

The problem is that we don't have the technology to travel anywhere close to the speed of light, and we don't have the technology to withstand extreme gravity, on say a neutron star or near an event horizon.

So the amount of Time Dilation we can practically achieve is very low, something like a fraction of a second. Not much use for anything except helping to calculate space rocket trajectories and such.

My point was that theoretically one way time machines do exist since even a dilation of microsecond is still a dilation.

 

[Chinese-Dragon]

My point was that theoretically one way time machines do exist since even a dilation of microsecond is still a dilation.

That's true. Someone who spends a large amount of time moving at high speed could give themselves a few extra seconds of life, "relative" to others. Though it won't affect him at all, since it is only relative to observers.

I read somewhere that if a subject stands near the center of an event horizon, the gravity there is so high that time will essentially "stop". So for an outside observer looking in, the observer will see the subject freeze completely.

Of course that is no use to the poor subject actually standing near the singularity. Since he is not the observer, time won't slow down at all from his perspective, rather for him, time will seem to speed up in the outside world.

Luckily, "spaghettification" near the center of an event horizon is not a painful death, despite the painful sounding name. The subject will die too quickly to feel much pain.

 

[anonymus]

That's true. Someone who spends a large amount of time moving at high speed could give themselves a few extra seconds of life, "relative" to others. Though it won't affect him at all, since it is only relative to observers.

I read somewhere that if a subject stands near the center of an event horizon, the gravity there is so high that time will essentially "stop". So for an outside observer looking in, the observer will see the subject freeze completely.

Of course that is no use to the poor subject actually standing near the event horizon. Since he is not the observer, time won't slow down at all from his perspective, rather for him, time will seem to speed up in the outside world.

Luckily, "spaghettification" is not a painful death, despite the painful sounding name. The subject will die too quickly to feel much pain.

spaghettification would be a problem with smaller black holes since their event horizon is very close to their core but massive black holes ( though this may seem to be paradoxical ) have their event horizons far away from their cores so in case on massive black holes, the person may theoretically survive.

And yes all addition of time occurs according to outside world. in other words observer would be moving into future but not his future but into others.

 

[sur]

We know it already, for past 1400+ years, the phenomenon of time becoming ZERO...
Though did not have equations developed that Einstein etc did.

Even if one argues that it was just a dream, even then the relation of traveling with speed of light is what is important in relation to this thread. Such travel affected the time; when he did wuzu, some water dropped & trickled on the side of pot & when he came back water was still dripping i.e. time became ~"ZERO"



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Prophet Muhammad traveled on a vehicle that traveled with speed of light or more may be...
He traveled out the time-&-space axes... Where our understanding of past-present-future does NOT apply.

http://en.wikipedia.org/wiki/Isra_and_Mi'raj


Book=Sahih-Muslim:

Prophet Muhammad said, "I was brought al-buraq who is an animal white and long, larger than a donkey but smaller than a mule, who would place its hoof at a distance equal to the range of vision (travel with ~ the Speed of light). I mounted it and came to Bait-al Maqdis (Jerusalem). I then tethered it to the ring used by the prophets. I entered the area of the Mosque and prayed two rak'at in it. I then came out and Gabriel brought me a vessel of wine and a vessel of milk. I chose the milk, and Gabriel said, 'You have chosen al-fitra, the natural way'.

He then ascended with me into the lower heavens and requested that they be opened. ... and there I was with Adam (travel to outside the bounds of our time-space). He welcomed me and prayed for my well-being.
Then we ascended to the second heaven and Gabriel requested that it be opened. .. Jesus and John welcomed me and prayed for my well-being.
Gabriel then ascended with me to the third heaven and requested that it be opened. .. and there I was with Joseph, who was given a great portion of beauty. He welcomed me and prayed for my well-being.
Gabriel then ascended with me to the fourth heaven and requested that it be opened... there I was with Enoch. He welcomed me and prayed for my well-being.
Gabriel then ascended with me to the fifth heaven and requested that it be opened. .. and there I was with Aaron. He welcomed me and prayed for my well-being.
Gabriel then ascended with me to the sixth heaven and requested that it be opened. ..and there I was with Moses. He welcomed me and prayed for my well-being.
Gabriel then ascended with me to the seventh heaven and requested that it be opened. .. and there I was with Abraham who was leaning against the bayt al-ma`mur into which enter seventy thousand angels each day never to return.
Then I was brought to the sidrat al-muntaha, the Lote Tree of the Furthest Limit, whose leaves were like the ears of an elephant and whose fruits at first appeared insignificant. But when Allah spread His command over them they transformed to the point where no one in creation could describe their beauty. Then Allah revealed what He revealed to me. ... Allah said, 'O Muhammad, there are five prayers every night and day. Each prayer is equal to ten prayers making them equal to fifty prayers. Whoever intends a good deed and does not do it, there will be written for him a single good deed. If he does it then there will be written for him ten good deeds. Whoever intends an evil deed and does not do it then there is nothing written against him. If he does it then there is written for him one evil deed.'..."

Last bold part is for American Agencies , who hire mentally unstable people who on their own were NOT capable of doing any harm, but those agents make them perform the crime or after conducting it themselves, blame it on those patsies..

 

[vijayjha]

i have a time machine that works
its my chair.....
let me explain i sat on it at 10:10 PM after 5 min i was in in future the time was 10:15 PM the trick is longer you sit more deep in future u will go to for example if u sit on my chair for 5 min u will be in 5 min future (of course the reference point is the time when u sit on it). just try with ur chair too i think it will work

 

[jha]

i have a time machine that works
its my chair.....
let me explain i sat on it at 10:10 PM after 5 min i was in in future the time was 10:15 PM the trick is longer you sit more deep in future u will go to for example if u sit on my chair for 5 min u will be in 5 min future (of course the reference point is the time when u sit on it). just try with ur chair too i think it will work

I had a friend in school with same name " Vijay Jha"... He used to give similar explanations...

 

[Ayush]

i have also seen on discovery that time passes slow near a big structure(like big buildings,pyramids,any big structure)....

 

[Sugarcane]

So, What's the conclusion for a layman?

 

[RazorMC]

So, What's the conclusion for a layman?

Travel in a plane to go back 0.5 millisecond in the past or future.

 

[HRK]

So, What's the conclusion for a layman?

time travel is possible if one move with or near to the the speed of light.......it will be a one way journey means one could not go back to its past.....

 

[Sugarcane]

Travel in a plane to go back 0.5 millisecond in the past or future.

Just 0.5 millisecond? Useless discovery

 

[cyphercide]

Why are time travel theories associated solely with the human element superimposed on them? It certainly would make sense to send over a burning bush(excuse the religious connotations) than to send over a George.W. Bush. Why? Because it is presumably easier to convey digital information(akin the 'message in a bottle' impregnated within the Voyager series) than to hope for an actual biospecimen to withstand the rigors of time travel.

 

[HRK]

Just 0.5 millisecond? Useless discovery

nope.......it depend the duration of your time travelling mean as long as you move with the or near to the speed of light theoretically you will be as deep in your future.

In actual terms time does not stop it will be you who will be a sort of confined in a particular time interval during your journey.....