In Craig Callender (ed.), The Oxford Handbook of Philosophy of Time. Oxford: Oxford University Press. pp. 577-630 (2009)

Authors
Christian Wüthrich
University of Geneva
Chris Smeenk
University of Western Ontario
Abstract
This paper is an enquiry into the logical, metaphysical, and physical possibility of time travel understood in the sense of the existence of closed worldlines that can be traced out by physical objects. We argue that none of the purported paradoxes rule out time travel either on grounds of logic or metaphysics. More relevantly, modern spacetime theories such as general relativity seem to permit models that feature closed worldlines. We discuss, in the context of Gödel's infamous argument for the ideality of time based on his eponymous spacetime, what this apparent physical possibility of time travel means. Furthermore, we review the recent literature on so-called time machines, i.e., of devices that produce closed worldlines where none would have existed otherwise. Finally, we investigate what the implications of the quantum behaviour of matter for the possibility of time travel might be and explicate in what sense time travel might be possible according to leading contenders for full quantum theories of gravity such as string theory and loop quantum gravity.
Keywords time travel  time machine  Gödel  general relativity
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References found in this work BETA

The Metaphysics Within Physics.Tim Maudlin - 2007 - Oxford University Press.
Quantum Gravity.Carlo Rovelli - 2007 - Cambridge University Press.
Asymmetries in Time.Paul Horwich - 1990 - Noûs 24 (5):804-806.

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Citations of this work BETA

Similarity, Topology, and Physical Significance in Relativity Theory.Samuel C. Fletcher - 2016 - British Journal for the Philosophy of Science 67 (2):365-389.
Global Spacetime Structure.John Byron Manchak - 2013 - Cambridge University Press.
The Structure of Causal Sets.Christian Wüthrich - 2012 - Journal for General Philosophy of Science / Zeitschrift für Allgemeine Wissenschaftstheorie 43 (2):223-241.
Malament–Hogarth Machines.J. B. Manchak - 2020 - British Journal for the Philosophy of Science 71 (3):1143-1153.

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