Tiem machines with non-compactly generated cauchy horizons and 'handy singularities'.

摘要

It is 10 years now that time machines (TM's) are intensively studied, but the main question, of whether or not TM's can be created remains still unanswered. MOst investigations so far have centered on TM's with compactly generated Cauchy horizons (compact TM's, or CTM's for brevity)~1. It has been understood that creation of such TM's is connected with at least two serious problems: