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If masses can not just appear and disappear, how do solutions with closed timelike curves work? If you have some mass happily looping around such curve, from some other point of view you have some "moments" where that mass exists (twice, even, for both branches of the CTC) and then some later moments where it does not...

I'm having trouble imagining what could be the boundary between those and how it does not form a "discontinuity"...

I guess this is not entirely theoretical question too, as I've read that virtual particle-antiparticle pairs can actually be viewed as a single particle on a CTC.

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# Closed timelike curves question

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