Is time travel possible based on theory?

Discussion in 'Physics & Math' started by Saint, Jun 9, 2019.

  1. Q-reeus Valued Senior Member

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    Not just relative velocity. Also relative position in gravitational potential, over (proper, or coordinate) time. As in fact you have touched on earlier.
     
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  3. Asexperia Valued Senior Member

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    Guys, everything that the Theory of relativity predicts occurs in the present, there is only one now. We have two clocks (one in space and one on Earth) with different times and both are in the present.
     
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  5. paddoboy Valued Senior Member

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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.
     
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  7. Asexperia Valued Senior Member

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    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.

     
    Last edited: Jun 12, 2019
  8. Write4U Valued Senior Member

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    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. ......

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    IMO, it is impossible to reconstruct an earlier "now", given the relative nature of history itself.
     
    Last edited: Jun 13, 2019 at 8:38 AM
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