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May 8, 2019 at 5:35 comment added user4552 It's easy to create spacetimes with holes cut out of them, etc., as you've done here. It's a pointless exercise because we have no reason to think spacetime has structure like this, and if structure like this did exist, our theories would not have any useful way to make predictions about those structures. For these reasons, we usually are interested in the maximal extension of any spacetime.
Mar 20, 2016 at 4:20 history edited Timaeus CC BY-SA 3.0
added 70 characters in body
Aug 17, 2015 at 23:53 history answered Timaeus CC BY-SA 3.0