| Issue |
EPJ Web of Conferences
Volume 58, 2013
TM 2012 – The Time Machine Factory [unspeakable, speakable] on Time Travel in Turin
|
|
|---|---|---|
| Article Number | 01001 | |
| Number of page(s) | 4 | |
| Section | Causality in Physics | |
| DOI | https://doi.org/10.1051/epjconf/20135801001 | |
| Published online | 05 September 2013 | |
https://doi.org/10.1051/epjconf/20135801001
Cosmic Time Machines: the Causality Issue
1 Dipartimento di Fisica e Astronomia, Università di Padova, I–35131 Padova, Italy
2 I.N.F.N. Istituto Nazionale di Fisica Nucleare, Sezione di Padova
a e-mail: defelice@pd.infn.it
Published online: 5 September 2013
Continued gravitational collapse gives rise to curvature singularities. If a curvature singularity is globally naked then the space-time may be causally future illbehaved admitting closed time-like or null curves which extend to asymptotic distances and generate a Cosmic Time Machine (de Felice (1995) Lecture Notes in Physics 455, 99 [6]). The existence of Cosmic Time Machines makes it plausible the violation of causality. I conjecture that this circumstance is prevented by some, yet unknown, physical process and show that such a mechanism indeed exists in the Kerr spacetime.
© Owned by the authors, published by EDP Sciences, 2013
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