TL;DR
This paper discusses the presence of closed timelike curves in solutions to Einstein's equations, questioning their physical interpretation and implications for the completeness of general relativity.
Contribution
It critically examines the physical plausibility of CTC solutions and highlights interpretational issues within general relativity.
Findings
Many Einstein solutions contain CTCs
Some CTC solutions involve ordinary materials
Interpretational challenges limit the physical applicability
Abstract
Many solutions of Einstein's field equations contain closed timelike curves (CTC). Some of these solutions refer to ordinary materials in situations which might occur in the laboratory, or in astrophysics. It is argued that, in default of a reasonable interpretation of CTC, general relativity does not give a satisfactory account of all phenomena within its terms of reference.
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