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Journal article 658 views

Constructing Time Machines

Graham Shore

Int. J. Mod. Phys., Volume: 18, Issue: 23, Pages: 4169 - 4200

Swansea University Author: Graham Shore

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DOI (Published version): 10.1142/S0217751X03015118

Abstract

The existence of time machines, understood as spacetime constructions exhibiting physically realised closed timelike curves (CTCs), would raise fundamental problems with causality and challenge our current understanding of classical and quantum theories of gravity. In this paper, we investigate thre...

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Published in: Int. J. Mod. Phys.
Published: 2003
Online Access: http://arxiv.org/abs/gr-qc/0210048
URI: https://cronfa.swan.ac.uk/Record/cronfa17508
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first_indexed 2014-03-21T02:30:09Z
last_indexed 2018-02-09T04:51:11Z
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spelling 2014-03-20T23:54:51.5312472 v2 17508 2014-03-20 Constructing Time Machines 28a24f55687c82d6f3ee378ead3cf234 Graham Shore Graham Shore true false 2014-03-20 FGSEN The existence of time machines, understood as spacetime constructions exhibiting physically realised closed timelike curves (CTCs), would raise fundamental problems with causality and challenge our current understanding of classical and quantum theories of gravity. In this paper, we investigate three proposals for time machines which share some common features: cosmic strings in relative motion, where the conical spacetime appears to allow CTCs; colliding gravitational shock waves, which in Aichelburg-Sexl coordinates imply discontinuous geodesics; and the superluminal propagation of light in gravitational radiation metrics in a modified electrodynamics featuring violations of the strong equivalence principle. While we show that ultimately none of these constructions creates a working time machine, their study illustrates the subtle levels at which causal self-consistency imposes itself, and we consider what intuition can be drawn from these examples for future theories. Journal Article Int. J. Mod. Phys. 18 23 4169 4200 20 9 2003 2003-09-20 10.1142/S0217751X03015118 http://arxiv.org/abs/gr-qc/0210048 COLLEGE NANME Science and Engineering - Faculty COLLEGE CODE FGSEN Swansea University 2014-03-20T23:54:51.5312472 2014-03-20T23:03:25.3678212 Faculty of Science and Engineering School of Biosciences, Geography and Physics - Physics Graham Shore 1
title Constructing Time Machines
spellingShingle Constructing Time Machines
Graham Shore
title_short Constructing Time Machines
title_full Constructing Time Machines
title_fullStr Constructing Time Machines
title_full_unstemmed Constructing Time Machines
title_sort Constructing Time Machines
author_id_str_mv 28a24f55687c82d6f3ee378ead3cf234
author_id_fullname_str_mv 28a24f55687c82d6f3ee378ead3cf234_***_Graham Shore
author Graham Shore
author2 Graham Shore
format Journal article
container_title Int. J. Mod. Phys.
container_volume 18
container_issue 23
container_start_page 4169
publishDate 2003
institution Swansea University
doi_str_mv 10.1142/S0217751X03015118
college_str Faculty of Science and Engineering
hierarchytype
hierarchy_top_id facultyofscienceandengineering
hierarchy_top_title Faculty of Science and Engineering
hierarchy_parent_id facultyofscienceandengineering
hierarchy_parent_title Faculty of Science and Engineering
department_str School of Biosciences, Geography and Physics - Physics{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Biosciences, Geography and Physics - Physics
url http://arxiv.org/abs/gr-qc/0210048
document_store_str 0
active_str 0
description The existence of time machines, understood as spacetime constructions exhibiting physically realised closed timelike curves (CTCs), would raise fundamental problems with causality and challenge our current understanding of classical and quantum theories of gravity. In this paper, we investigate three proposals for time machines which share some common features: cosmic strings in relative motion, where the conical spacetime appears to allow CTCs; colliding gravitational shock waves, which in Aichelburg-Sexl coordinates imply discontinuous geodesics; and the superluminal propagation of light in gravitational radiation metrics in a modified electrodynamics featuring violations of the strong equivalence principle. While we show that ultimately none of these constructions creates a working time machine, their study illustrates the subtle levels at which causal self-consistency imposes itself, and we consider what intuition can be drawn from these examples for future theories.
published_date 2003-09-20T03:20:13Z
_version_ 1763750564330471424
score 11.016235

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