Time Travel Physics

Cluster focuses on debates about whether faster-than-light travel, closed timelike curves, or relativity enable time travel, including paradoxes, self-consistency principles, and impossibility arguments.

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Keywords

googleusercontent.com FTL UTF I.e CTC en.m AND NOT SR CNN time travel travel relativity past universe future light spatial causal dimension

Sample Comments

erpa1119 • Aug 25, 2012 • View on HN

does this open the door to possibly traveling back in time?

steveklabnik • Sep 15, 2018 • View on HN

It's impossible to tell, as that can cause other issues. See the link I posted about time travel elsewhere in the thread.

HugoDaniel • Apr 12, 2018 • View on HN

Does this mean time travel is possible ?

pentabular • Aug 24, 2014 • View on HN

no such thing as backwards time travel, sorry!

mackman • Dec 5, 2023 • View on HN

Wouldn't that prevent time from going in reverse?

mrfusion • Dec 15, 2021 • View on HN

I think you’re describing this? https://en.m.wikipedia.org/wiki/Novikov_self-consistency_pri...

eyudkowsky • Jul 13, 2008 • View on HN

Only one-way interaction between different selves? And you call this time travel.

bookofjoe • Feb 20, 2020 • View on HN

"If time travel is possible, then there is no such thing as time."—Kurt Gödel

lucaspauker • Oct 11, 2020 • View on HN

You're right however this isn't possible with our current understanding of time: https://en.wikipedia.org/wiki/Spacetime

layer8 • Jan 14, 2024 • View on HN

FTL implies time travel. The into-the-past kind. Good luck with that.