Are Causality Violations Undesirable?
 Hunter Monroe
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Causality violations are typically seen as unrealistic and undesirable features of a physical model. The following points out three reasons why causality violations, which Bonnor and Steadman identified even in solutions to the Einstein equation referring to ordinary laboratory situations, are not necessarily undesirable. First, a spacetime in which every causal curve can be extended into a closed causal curve is singularity free—a necessary property of a globally applicable physical theory. Second, a causalityviolating spacetime exhibits a nontrivial topology—no closed timelike curve (CTC) can be homotopic among CTCs to a point, or that point would not be causally well behaved—and nontrivial topology has been explored as a model of particles. Finally, if every causal curve in a given spacetime passes through an event horizon, a property which can be called “causal censorship”, then that spacetime with event horizons excised would still be causally well behaved.
 Title
 Are Causality Violations Undesirable?
 Journal

Foundations of Physics
Volume 38, Issue 11 , pp 10651069
 Cover Date
 200811
 DOI
 10.1007/s1070100892549
 Print ISSN
 00159018
 Online ISSN
 15729516
 Publisher
 Springer US
 Additional Links
 Topics
 Keywords

 General relativity
 Differential geometry
 Spacetime topology
 Industry Sectors
 Authors

 Hunter Monroe ^{(1)}
 Author Affiliations

 1. International Monetary Fund, Washington, DC, 20431, USA