Creating a Time Machine: Can it be Done?

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SUMMARY

The discussion centers on the theoretical feasibility of time travel, specifically distinguishing between forward and backward time travel. It asserts that while traveling forward in time is possible through relativistic effects, such as traveling at high speeds, backward time travel remains unfeasible due to the lack of observed exotic matter and energy, which are necessary for such phenomena. The conversation emphasizes the philosophical implications of reverse time travel, particularly the preservation of causality, suggesting that a 'chrononaut' would not be able to return to their original timeline.

PREREQUISITES
  • Understanding of General Relativity (GR)
  • Familiarity with relativistic physics concepts
  • Knowledge of the implications of causality in time travel
  • Basic comprehension of the concept of exotic matter and energy
NEXT STEPS
  • Research the implications of General Relativity on time travel
  • Explore the concept of time dilation in relativistic physics
  • Investigate the theoretical properties of exotic matter and energy
  • Study philosophical perspectives on causality and time travel
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Physicists, philosophers, science fiction writers, and anyone interested in the theoretical aspects of time travel and its implications on causality.

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Can we ever create a time machine?:!)
 
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Travelling back in time, in theory, requires exotic inputs - like imaginary [mathematically speaking] matter and energy. Given evidence of their existence has not been observed, it appears to be an unphysical consequence of GR. From a more philosophical / logical persective, I think reverse time travel would eternally preclude a 'chrononaut' from returning to his/her original time line. This would be necessary to preserve causality, IMO.
 
Travelling forward in time, however, is sort of feasible based on Relativity. Just travel really fast for a while (like on a spaceship) and when you return, you'll see that time on Earth will have moved faster than it did for you. The faster you go, the farther into the future you can visit. No way to return though.
 

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