Can Time Really Loop and Repeat Itself in the Universe?

[Mega_Destructor]

I was just wondering, if time can be dilated by gravity, can it actually loop and repeat itself (like movies), and if anyone was there it somehow witness it, they would see everything repeated? Sorry if this sounds silly, but I'm curious.

 

[jedishrfu]

This more of a science fiction concept like Groundhog Day. The science behind it ie General Relativity mentions time slowing down for some observers. Looping back requires something called exotic matter to hold open a wormhole in spacetime which is allowed by GR.

Physicists are split on this often citing ideas like the universe forbids things like the grandfather paradox where the grandson goes back in time to prevent grandpa from meeting grandma and hence preventing himself from being born.

You can read more about it here:

https://en.wikipedia.org/wiki/Wormhole

Keep in mind that this is all theoretical and that no wormholes have ever been discovered nor has exotic matter ever been identified and discovered.

 

[Dale]

I was just wondering, if time can be dilated by gravity, can it actually loop and repeat itself (like movies), and if anyone was there it somehow witness it, they would see everything repeated? Sorry if this sounds silly, but I'm curious.

If you want to search for technical articles on the topic the scientific term is a "closed timelike curve"