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Article: Inflating wormholes in the braneworld models

TitleInflating wormholes in the braneworld models
Authors
KeywordsGravitation and cosmology
Astrophysics and astroparticles
Issue Date2011
PublisherInstitute of Physics Publishing. The Journal's web site is located at http://www.iop.org/EJ/cqg
Citation
Classical And Quantum Gravity, 2011, v. 28 n. 14 How to Cite?
AbstractThe braneworld model, in which our Universe is a three-brane embedded in a five-dimensional bulk, allows the existence of wormholes, without any violation of the energy conditions. A fundamental ingredient of traversable wormholes is the violation of the null energy condition (NEC). However, in the braneworld models, the stress-energy tensor confined on the brane, threading the wormhole, satisfies the NEC. In conventional general relativity, wormholes existing before inflation can be significantly enlarged by the expanding spacetime. We investigate the evolution of an inflating wormhole in the braneworld scenario, in which the wormhole is supported by the nonlocal braneworld effects. As a first step in our study, we consider the possibility of embedding a four-dimensional braneworld wormhole into a five-dimensional bulk. The conditions for the embedding are obtained by studying the junction conditions for the wormhole geometry, as well as the full set of the five-dimensional bulk field equations. For the description of the inflation, we adopt the chaotic inflation model. We study the dynamics of the braneworld wormholes during the exponential inflation stage, and in the stage of the oscillating scalar field. A particular exact solution corresponding to a zero redshift wormhole is also obtained. The resulting evolution shows that while the physical and geometrical parameters of a zero redshift wormhole decay naturally, a wormhole satisfying some very general initial conditions could turn into a black hole and exist forever. © 2011 IOP Publishing Ltd.
Persistent Identifierhttp://hdl.handle.net/10722/139647
ISSN
2015 Impact Factor: 2.837
2015 SCImago Journal Rankings: 1.633
ISI Accession Number ID
Funding AgencyGrant Number
Research Grants Council of the Hong Kong Special Administrative Region, ChinaHKU 701808P
Funding Information:

We would like to thank the anonymous referees for comments and suggestions that helped us significantly improve the manuscript. The authors would like to thank Dr F S N Lobo for useful suggestions and discussions. The work described in this paper was supported by a grant from the Research Grants Council of the Hong Kong Special Administrative Region, China (Project no HKU 701808P).

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DC FieldValueLanguage
dc.contributor.authorWong, KCen_HK
dc.contributor.authorHarko, Ten_HK
dc.contributor.authorCheng, KSen_HK
dc.date.accessioned2011-09-23T05:52:54Z-
dc.date.available2011-09-23T05:52:54Z-
dc.date.issued2011en_HK
dc.identifier.citationClassical And Quantum Gravity, 2011, v. 28 n. 14en_HK
dc.identifier.issn0264-9381en_HK
dc.identifier.urihttp://hdl.handle.net/10722/139647-
dc.description.abstractThe braneworld model, in which our Universe is a three-brane embedded in a five-dimensional bulk, allows the existence of wormholes, without any violation of the energy conditions. A fundamental ingredient of traversable wormholes is the violation of the null energy condition (NEC). However, in the braneworld models, the stress-energy tensor confined on the brane, threading the wormhole, satisfies the NEC. In conventional general relativity, wormholes existing before inflation can be significantly enlarged by the expanding spacetime. We investigate the evolution of an inflating wormhole in the braneworld scenario, in which the wormhole is supported by the nonlocal braneworld effects. As a first step in our study, we consider the possibility of embedding a four-dimensional braneworld wormhole into a five-dimensional bulk. The conditions for the embedding are obtained by studying the junction conditions for the wormhole geometry, as well as the full set of the five-dimensional bulk field equations. For the description of the inflation, we adopt the chaotic inflation model. We study the dynamics of the braneworld wormholes during the exponential inflation stage, and in the stage of the oscillating scalar field. A particular exact solution corresponding to a zero redshift wormhole is also obtained. The resulting evolution shows that while the physical and geometrical parameters of a zero redshift wormhole decay naturally, a wormhole satisfying some very general initial conditions could turn into a black hole and exist forever. © 2011 IOP Publishing Ltd.en_HK
dc.languageengen_US
dc.publisherInstitute of Physics Publishing. The Journal's web site is located at http://www.iop.org/EJ/cqgen_HK
dc.relation.ispartofClassical and Quantum Gravityen_HK
dc.rightsClassical and Quantum Gravity. Copyright © Institute of Physics Publishing.-
dc.subjectGravitation and cosmology-
dc.subjectAstrophysics and astroparticles-
dc.titleInflating wormholes in the braneworld modelsen_HK
dc.typeArticleen_HK
dc.identifier.emailHarko, T: harko@hkucc.hku.hken_HK
dc.identifier.emailCheng, KS: hrspksc@hkucc.hku.hken_HK
dc.identifier.authorityHarko, T=rp01333en_HK
dc.identifier.authorityCheng, KS=rp00675en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1088/0264-9381/28/14/145023en_HK
dc.identifier.scopuseid_2-s2.0-79959822120en_HK
dc.identifier.hkuros195612en_US
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-79959822120&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume28en_HK
dc.identifier.issue14en_HK
dc.identifier.isiWOS:000291789300023-
dc.publisher.placeUnited Kingdomen_HK
dc.relation.projectBrane world cosmology: post-inflationary reheating and gravitational lensing-
dc.identifier.scopusauthoridWong, KC=36085523500en_HK
dc.identifier.scopusauthoridHarko, T=7006485783en_HK
dc.identifier.scopusauthoridCheng, KS=9745798500en_HK

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