Can Closed Timelike Curves Make Time Travel Possible?

AI Thread Summary
Time travel is deemed impossible primarily because time is perceived as a flow rather than a tangible entity, with only the present moment existing. The concept of "closed timelike curves" in general relativity suggests a theoretical framework where time travel could occur, but it implies a predetermined universe devoid of free will. This notion posits that all moments in time are fixed and unchangeable, making time travel a complex and speculative topic. The discussion emphasizes the need for specific references to explore the intricacies of time travel further. Overall, the consensus leans towards skepticism about the feasibility of time travel.
D00dman
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Hey guys,
Why you think time travel will be or won't be possible either now or in the future?
 
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"Time Travel" won't be possible, ever. Primarily because time does not really exist, only "now"... We perceive a "flow of time" only because we can "remember the past" in various ways, and because we can project our thoughts into (plan for) "the future."

In a Universe where "time travel" is possible, every "now" that has ever happened (past or future) must already have happened, with each separate "now" forever existing in some strange "frozen" state, to which a "time traveler" could then presumably navigate back and forth...

This (a completely predetermined and never-changing Universe, with no free will) should be enough to convince you that you can forget about "time travel"...
 
D00dman, if you have a specific reference you would like to discuss then we can do that. But as you can see the question as posed is too broad and encourages unsupported personal speculation.

The technical term for time travel that may be possible in general relativity is "closed timelike curves". You should be able to find a good reference.
 

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