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Blueberry comments on Open Thread: June 2010 - Less Wrong
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What do you think of the following answer? There is some evidence that backward time travel may be possible under some circumstances in a way that is compatible with general relativity. So suppose, many years in the future, a team of physicists and engineers creates a wormhole in the universe and sends something back to the time of the Big Bang, causing it and creating our universe. That way, it's all self-contained.
Self-contained is good, though it doesn't resolve the existence problem. (What is the appropriate cliché there ... you can't pull yourself out of quicksand by pulling on your boots?)
Backward time travel itself opens up a number of wonderful possibilities, including universe self-reflection and the possibility of a post-hoc framework of objective value.
It also makes encryption more difficult!