Time travel, hyperspace and Cheshire Cats

Synthese 195 (11):5037-5058 (2018)
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Abstract

H. G. Wells’ Time Traveller inhabits uniform Newtonian time. Where relativistic/quantum travelers into the past follow spacetime curvatures, past-bound Wellsians must reverse their direction of travel relative to absolute time. William Grey and Robin Le Poidevin claim reversing Wellsians must overlap with themselves or fade away piecemeal like the Cheshire Cat. Self-overlap is physically impossible but ‘Cheshire Cat’ fades destroy Wellsians’ causal continuity and breed bizarre fusions of traveler-stages with opposed time-directions. However, Wellsians who rotate in higher-dimensional space can reverse temporal direction without self-overlap, Cheshire Cats or mereological monstrosities. Alas, hyper-rotation in Newtonian space poses dynamic and biological problems,. Controllable and survivable Wellsian travel needs topologically-variable spaces. Newtonian space, not Newtonian time, is Wellsians’ real enemy.

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Alasdair Richmond
University of Edinburgh

Citations of this work

Paradoxes of Time Travel to the Future.Sara Bernstein - 2022 - In Helen Beebee & A. R. J. Fisher (eds.), Perspectives on the Philosophy of David K. Lewis. Oxford: Oxford University Press.

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References found in this work

On the Plurality of Worlds.David K. Lewis - 1986 - Malden, Mass.: Wiley-Blackwell.
On the Plurality of Worlds.David Lewis - 1986 - Revue Philosophique de la France Et de l'Etranger 178 (3):388-390.
The Paradoxes of Time Travel.David Lewis - 1976 - American Philosophical Quarterly 13 (2):145-152.
A Future for Presentism.Craig Bourne - 2006 - Oxford, GB: Oxford University Press UK.
Contingent identity.Allan Gibbard - 1975 - Journal of Philosophical Logic 4 (2):187-222.

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