EPJ Web of Conferences
Volume 58, 2013TM 2012 – The Time Machine Factory [unspeakable, speakable] on Time Travel in Turin
|Number of page(s)||4|
|Section||Causality in Physics|
|Published online||05 September 2013|
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: firstname.lastname@example.org
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 ). 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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