Not just relative velocity. Also relative position in gravitational potential, over (proper, or coordinate) time. As in fact you have touched on earlier.
Is time travel possible based on theory?
- Thread starter Saint
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That is false. There is no universal "now"...that is covered by SR and simultaneity. Different frames of references will always disagree on whether two event are simultaneous. We can never see anything as it is "Now"
Look at the Alpha Centauri system tonight, and you are seeing that as it was 4.3 years ago...That's SR, and by extension GR....both have been thoroughly tested and are continually tested everyday, and continually pass those tests.
Asexperia
Registered Senior Member
The principle of the disagreement of the now considers that two observers, one of them at rest and another in movement, do not agree on whether two events are simultaneous or successive. The disagreement is in the now, in the present. The events take a back seat. Relativity is a theory of disagreement.
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Write4U
Valued Senior Member
Can you travel back in memory? If not what makes anyone think we can travel back in time?
A memory requires fixed coordinates, whether they be in the mind or in time. There is no way that we can "dial" in a specific spacetime coordinate from the past. ......
IMO, it is impossible to reconstruct an earlier "now", given the relative nature of history itself.
A memory requires fixed coordinates, whether they be in the mind or in time. There is no way that we can "dial" in a specific spacetime coordinate from the past. ......
IMO, it is impossible to reconstruct an earlier "now", given the relative nature of history itself.
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I agree. Memory is the only way to travel into the past.
Write4U
Valued Senior Member
However, there are media which allow for a partial memory reconstruction.I agree. Memory is the only way to travel into the past.
David Bohm did a famous experiment where he proved that memory does exist in physical form as well.
It's really neat, but of course it never goes back in time but only in local space.
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Impressive.
But it's not time-travel. The dots still reformed AFTER they had mixed.
But it's not time-travel. The dots still reformed AFTER they had mixed.
Besides, time-travel is possible by predicting the future. For example, should I decide that, "I will die," the moment I do in fact die, time will be reversed. I love the bravery of some people when I tell them that I will die: occasionally they reply; "we will all die." Translation: "if I die, I will kill everyone." Of course an even further intrusion into the future may reveal that, "I am dead."
Of course an even further intrusion into the future may reveal that, "I am dead." 
Vmedvil
Registered Member
Reverse Time Travel is impossible as you would need to travel faster than the speed of light to begin to move backward in time, this can be solved from the special relativity equations just plug in a velocity faster than C into the equation you get a negative time value and no it couldn't be anything like warping space to travel faster than light which is theoretically possible to do it you would literally need a infinite amount of energy to travel backward in time as the warping effect bends space against itself and not time against itself from an exotic matter like Dark Energy, though using wormholes you could theoretically travel into the past but still you would need to direct the wormhole into the past which would require exotic matter with Negative Mass just as the faster than light travel scenario of reverse time travel which Negative Mass matter has yet to be found. So, at this point in history it is impossible until certain qualifications are met for negative mass exotic matter for these scenarios. Another Scenario is that you transmit data backward in time via Quantum Entanglement which would require the entanglement of matter through time instead of space as Virtual Photons of Quantum Entanglement theoretically travel faster than light, all being scenarios with technology yet to be invented or ever done in practice or may not exist in the first place.
On the other hand, traveling at accelerated time velocities toward the future seems to be quiet possible under the laws of physics as all you would need is to be near a strong Gravitational field or traveling at any velocity less than C through space, every object in motion travels at a different time velocity as time dilation takes effect when objects are in motion. The closer you travel to the speed of light the slower the time experienced for you is versus the slower space velocity objects in motion, thus time seems to travel faster around you being that you experience less time in your reference frame traveling at the faster space velocity.
On the other hand, traveling at accelerated time velocities toward the future seems to be quiet possible under the laws of physics as all you would need is to be near a strong Gravitational field or traveling at any velocity less than C through space, every object in motion travels at a different time velocity as time dilation takes effect when objects are in motion. The closer you travel to the speed of light the slower the time experienced for you is versus the slower space velocity objects in motion, thus time seems to travel faster around you being that you experience less time in your reference frame traveling at the faster space velocity.
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An infinite amount of energy? What if I could create something that exists FOREVER? Any theory, whether in language or mathematical. If it exists FOREVER, would this negate time, voiding it, making time-travel possible?
Vmedvil
Registered Member
I don't think so as photons do not experience time in the sense that they can exist forever and do not travel backward in time, so I don't think that scenario would effect it, it is just a solution to special relativity I was talking about when traveling faster than light time dilation gets a negative number. It seems it is something about the velocity of faster than light that makes it travel in the reverse of time, but to be more accurate time gets a imaginary number as you cannot take the sqaure root of any negative number.
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Why do you think time-travel must be mathematical? What of Psychology? For example, the Oedipol complex. Murdering your Father, getting your Mother pregnant, having intercourse with your child as it grows and tries to kill you (so they may have intercourse with their Mother.) All of this happens because YOU LOVE YOUR MUM. Is that not forever, an infinite supply of energy?
...and if I decide that "I will die" or that "I am dead" would that not remain true, FOREVER?
...and I was wrong! Therefore I will not die.
This was many years ago and I believe by now he has given up.
https://en.wikipedia.org/wiki/Ronald_Mallett
https://www.nbcnews.com/leftfield/v...t-wants-to-build-a-time-machine-1261960259539
Benson
Registered Senior Member
If time travel has happened, did the person(s) go forward or backward in time? So are we currently in the past, present or future? If someone has gone into the future then now is the past and if they went into the past then we are now in the future. But if no one went anywhere, then now is the present.
Also, if you went into the past before you were born, would you cease to exist?
Also, if you went into the past before you were born, would you cease to exist?