Is Time Travel Possible and How Does it Work?

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Time travel remains a highly debated topic, with discussions centering on its feasibility and implications. Theories suggest that if time travel were possible, altering past events could lead to paradoxes or the creation of alternate universes, as seen in concepts like the Many Worlds Interpretation. Some physicists argue that quantum mechanics might prevent any changes to the past, ensuring that events unfold consistently with the future. Additionally, the physical laws governing the universe may not allow for the necessary conditions to enable time travel, such as traversable wormholes. Overall, while time travel captivates the imagination, current scientific understanding suggests it is unlikely to be achievable.
  • #31
stefanbanev said:
to get back "home" would be quite a challenge

Following a Closed Timelike Curve (CTC) doesn't mean you go backwards in time. Locally, you still experience time going forwards, but as you follow this CTC you can end up at some time before you started. The problem is that it can take a very, very long time to follow a CTC, and as you're traveling along the CTC, spacetime continues to expand. It could be challenging to identify "home".
 

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