Constructing Time Machines.
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| Title: | Constructing Time Machines. |
|---|---|
| Authors: | Shore, G. M.1 |
| Source: | International Journal of Modern Physics A: Particles & Fields; Gravitation; Cosmology; Nuclear Physics. 9/20/2003, Vol. 18 Issue 23, p4169. 32p. |
| Subjects: | Spacetime, Causality (Physics), Quantum theory |
| Abstract: | The existence of time machines, understood as space–time constructions exhibiting physically realised closed timelike curves (CTC's), 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 space–time appears to allow CTC's; 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. [ABSTRACT FROM AUTHOR] |
| Copyright of International Journal of Modern Physics A: Particles & Fields; Gravitation; Cosmology; Nuclear Physics is the property of World Scientific Publishing Company and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
| Database: | Engineering Source |
| FullText | Text: Availability: 0 |
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| Header | DbId: egs DbLabel: Engineering Source An: 10991839 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Constructing Time Machines. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Shore%2C+G%2E+M%2E%22">Shore, G. M.</searchLink><relatesTo>1</relatesTo> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22International+Journal+of+Modern+Physics+A%3A+Particles+%26+Fields%3B+Gravitation%3B+Cosmology%3B+Nuclear+Physics%22">International Journal of Modern Physics A: Particles & Fields; Gravitation; Cosmology; Nuclear Physics</searchLink>. 9/20/2003, Vol. 18 Issue 23, p4169. 32p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Spacetime%22">Spacetime</searchLink><br /><searchLink fieldCode="DE" term="%22Causality+%28Physics%29%22">Causality (Physics)</searchLink><br /><searchLink fieldCode="DE" term="%22Quantum+theory%22">Quantum theory</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: The existence of time machines, understood as space–time constructions exhibiting physically realised closed timelike curves (CTC's), 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 space–time appears to allow CTC's; 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. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of International Journal of Modern Physics A: Particles & Fields; Gravitation; Cosmology; Nuclear Physics is the property of World Scientific Publishing Company and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1142/S0217751X03015118 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 32 StartPage: 4169 Subjects: – SubjectFull: Spacetime Type: general – SubjectFull: Causality (Physics) Type: general – SubjectFull: Quantum theory Type: general Titles: – TitleFull: Constructing Time Machines. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Shore, G. M. IsPartOfRelationships: – BibEntity: Dates: – D: 20 M: 09 Text: 9/20/2003 Type: published Y: 2003 Identifiers: – Type: issn-print Value: 0217751X Numbering: – Type: volume Value: 18 – Type: issue Value: 23 Titles: – TitleFull: International Journal of Modern Physics A: Particles & Fields; Gravitation; Cosmology; Nuclear Physics Type: main |
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