Cylindrical wormholes: A search for viable phantom-free models in GR.
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| Title: | Cylindrical wormholes: A search for viable phantom-free models in GR. |
|---|---|
| Authors: | Bronnikov, K. A.1,2,3 (AUTHOR) kb20@yandex.ru, Bolokhov, S. V.2 (AUTHOR) boloh@rambler.ru, Skvortsova, M. V.4 (AUTHOR) milenas577@mail.ru |
| Source: | International Journal of Modern Physics D: Gravitation, Astrophysics & Cosmology. Oct2019, Vol. 28 Issue 13, pN.PAG-N.PAG. 16p. |
| Subjects: | Energy density, General relativity (Physics), Relativity (Physics), Scalar field theory |
| Geographic Terms: | Greece |
| Abstract: | The well-known problem of wormholes in General Relativity (GR) is the necessity of exotic matter, violating the Weak Energy Condition (WEC), for their support. This problem looks easier if, instead of island-like configurations, one considers string-like ones, among them, cylindrically symmetric spacetimes with rotation. However, for cylindrical wormhole solutions, a problem is the lacking asymptotic flatness, making it impossible to observe their entrances as local objects in our universe. It was suggested to solve this problem by joining a wormhole solution to flat asymptotic regions at some surfaces Σ − and Σ + on different sides of the throat. The configuration then consists of three regions, the internal one containing a throat and two flat external ones. We discuss different kinds of source matter suitable for describing the internal regions of such models (scalar fields, isotropic and anisotropic fluids) and present two examples where the internal matter itself and the surface matter on both junction surfaces Σ ± respect the WEC. In one of these models, the internal source is a stiff perfect fluid whose pressure is equal to its energy density, in the other, it is a special kind of anisotropic fluid. Both models are free from closed timelike curves. We thus obtain examples of regular twice asymptotically flat wormhole models in GR without exotic matter and without causality violations. [ABSTRACT FROM AUTHOR] |
| Copyright of International Journal of Modern Physics D: Gravitation, Astrophysics & Cosmology 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: 139861240 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Cylindrical wormholes: A search for viable phantom-free models in GR. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Bronnikov%2C+K%2E+A%2E%22">Bronnikov, K. A.</searchLink><relatesTo>1,2,3</relatesTo> (AUTHOR)<i> kb20@yandex.ru</i><br /><searchLink fieldCode="AR" term="%22Bolokhov%2C+S%2E+V%2E%22">Bolokhov, S. V.</searchLink><relatesTo>2</relatesTo> (AUTHOR)<i> boloh@rambler.ru</i><br /><searchLink fieldCode="AR" term="%22Skvortsova%2C+M%2E+V%2E%22">Skvortsova, M. V.</searchLink><relatesTo>4</relatesTo> (AUTHOR)<i> milenas577@mail.ru</i> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22International+Journal+of+Modern+Physics+D%3A+Gravitation%2C+Astrophysics+%26+Cosmology%22">International Journal of Modern Physics D: Gravitation, Astrophysics & Cosmology</searchLink>. Oct2019, Vol. 28 Issue 13, pN.PAG-N.PAG. 16p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Energy+density%22">Energy density</searchLink><br /><searchLink fieldCode="DE" term="%22General+relativity+%28Physics%29%22">General relativity (Physics)</searchLink><br /><searchLink fieldCode="DE" term="%22Relativity+%28Physics%29%22">Relativity (Physics)</searchLink><br /><searchLink fieldCode="DE" term="%22Scalar+field+theory%22">Scalar field theory</searchLink> – Name: SubjectGeographic Label: Geographic Terms Group: Su Data: <searchLink fieldCode="DE" term="%22Greece%22">Greece</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: The well-known problem of wormholes in General Relativity (GR) is the necessity of exotic matter, violating the Weak Energy Condition (WEC), for their support. This problem looks easier if, instead of island-like configurations, one considers string-like ones, among them, cylindrically symmetric spacetimes with rotation. However, for cylindrical wormhole solutions, a problem is the lacking asymptotic flatness, making it impossible to observe their entrances as local objects in our universe. It was suggested to solve this problem by joining a wormhole solution to flat asymptotic regions at some surfaces Σ − and Σ + on different sides of the throat. The configuration then consists of three regions, the internal one containing a throat and two flat external ones. We discuss different kinds of source matter suitable for describing the internal regions of such models (scalar fields, isotropic and anisotropic fluids) and present two examples where the internal matter itself and the surface matter on both junction surfaces Σ ± respect the WEC. In one of these models, the internal source is a stiff perfect fluid whose pressure is equal to its energy density, in the other, it is a special kind of anisotropic fluid. Both models are free from closed timelike curves. We thus obtain examples of regular twice asymptotically flat wormhole models in GR without exotic matter and without causality violations. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of International Journal of Modern Physics D: Gravitation, Astrophysics & Cosmology 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/S0218271819410086 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 16 StartPage: N.PAG Subjects: – SubjectFull: Energy density Type: general – SubjectFull: General relativity (Physics) Type: general – SubjectFull: Relativity (Physics) Type: general – SubjectFull: Scalar field theory Type: general – SubjectFull: Greece Type: general Titles: – TitleFull: Cylindrical wormholes: A search for viable phantom-free models in GR. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Bronnikov, K. A. – PersonEntity: Name: NameFull: Bolokhov, S. V. – PersonEntity: Name: NameFull: Skvortsova, M. V. IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 10 Text: Oct2019 Type: published Y: 2019 Identifiers: – Type: issn-print Value: 02182718 Numbering: – Type: volume Value: 28 – Type: issue Value: 13 Titles: – TitleFull: International Journal of Modern Physics D: Gravitation, Astrophysics & Cosmology Type: main |
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