Chronology Protection in f(T) Gravity: The Case of Gott’s Pair of Moving Cosmic Strings

Autores
Fiorini, Franco Luis
Año de publicación
2024
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
As a consequence of the spacetime structure, defined by the tetrad field instead of the metric tensor alone, f(T) gravity seems to harbor its own chronology protection agency. When Gott´s pair of moving cosmic strings is considered, it is shown that the requirement of having a global parallelization --i.e. a global smooth field of tetrads-- drastically restrict the form of the tetrads on the junction surface between the two strings. The junction conditions on the tetrad field are satisfied only if the corresponding boosts needed to put the strings in motion are null on the matching surface. This seems to throw overboard Gott´s construction from the outset without the need of analyzing the divergence of the expectation value of the energy momentum tensor on the Cauchy horizon, evading in this way bothering quarrels concerning the choice of vacuum.
Fil: Fiorini, Franco Luis. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte; Argentina. Comisión Nacional de Energía Atómica. Gerencia del Área de Energía Nuclear. Instituto Balseiro; Argentina. Comisión Nacional de Energía Atómica. Centro Atómico Bariloche; Argentina
Materia
Gott´s space
f(T) gravity
Chronology Protection
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by/2.5/ar/
Repositorio
CONICET Digital (CONICET)
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador
oai:ri.conicet.gov.ar:11336/230906
Acceder
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network_name_str CONICET Digital (CONICET)
spelling Chronology Protection in f(T) Gravity: The Case of Gott’s Pair of Moving Cosmic StringsFiorini, Franco LuisGott´s spacef(T) gravityChronology Protectionhttps://purl.org/becyt/ford/1.3https://purl.org/becyt/ford/1As a consequence of the spacetime structure, defined by the tetrad field instead of the metric tensor alone, f(T) gravity seems to harbor its own chronology protection agency. When Gott´s pair of moving cosmic strings is considered, it is shown that the requirement of having a global parallelization --i.e. a global smooth field of tetrads-- drastically restrict the form of the tetrads on the junction surface between the two strings. The junction conditions on the tetrad field are satisfied only if the corresponding boosts needed to put the strings in motion are null on the matching surface. This seems to throw overboard Gott´s construction from the outset without the need of analyzing the divergence of the expectation value of the energy momentum tensor on the Cauchy horizon, evading in this way bothering quarrels concerning the choice of vacuum.Fil: Fiorini, Franco Luis. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte; Argentina. Comisión Nacional de Energía Atómica. Gerencia del Área de Energía Nuclear. Instituto Balseiro; Argentina. Comisión Nacional de Energía Atómica. Centro Atómico Bariloche; ArgentinaMDPI2024-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/230906Fiorini, Franco Luis; Chronology Protection in f(T) Gravity: The Case of Gott’s Pair of Moving Cosmic Strings; MDPI; Universe; 10; 1; 1-2024; 1-102218-1997CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/https://www.mdpi.com/2218-1997/10/1/52info:eu-repo/semantics/altIdentifier/doi/10.3390/universe10010052info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-29T09:59:29Zoai:ri.conicet.gov.ar:11336/230906instacron:CONICETInstitucionalhttp://ri.conicet.gov.ar/Organismo científico-tecnológicoNo correspondehttp://ri.conicet.gov.ar/oai/requestdasensio@conicet.gov.ar; lcarlino@conicet.gov.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:34982025-09-29 09:59:29.393CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Chronology Protection in f(T) Gravity: The Case of Gott’s Pair of Moving Cosmic Strings
title Chronology Protection in f(T) Gravity: The Case of Gott’s Pair of Moving Cosmic Strings
spellingShingle Chronology Protection in f(T) Gravity: The Case of Gott’s Pair of Moving Cosmic Strings
Fiorini, Franco Luis
Gott´s space
f(T) gravity
Chronology Protection
title_short Chronology Protection in f(T) Gravity: The Case of Gott’s Pair of Moving Cosmic Strings
title_full Chronology Protection in f(T) Gravity: The Case of Gott’s Pair of Moving Cosmic Strings
title_fullStr Chronology Protection in f(T) Gravity: The Case of Gott’s Pair of Moving Cosmic Strings
title_full_unstemmed Chronology Protection in f(T) Gravity: The Case of Gott’s Pair of Moving Cosmic Strings
title_sort Chronology Protection in f(T) Gravity: The Case of Gott’s Pair of Moving Cosmic Strings
dc.creator.none.fl_str_mv Fiorini, Franco Luis
author Fiorini, Franco Luis
author_facet Fiorini, Franco Luis
author_role author
dc.subject.none.fl_str_mv Gott´s space
f(T) gravity
Chronology Protection
topic Gott´s space
f(T) gravity
Chronology Protection
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.3
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv As a consequence of the spacetime structure, defined by the tetrad field instead of the metric tensor alone, f(T) gravity seems to harbor its own chronology protection agency. When Gott´s pair of moving cosmic strings is considered, it is shown that the requirement of having a global parallelization --i.e. a global smooth field of tetrads-- drastically restrict the form of the tetrads on the junction surface between the two strings. The junction conditions on the tetrad field are satisfied only if the corresponding boosts needed to put the strings in motion are null on the matching surface. This seems to throw overboard Gott´s construction from the outset without the need of analyzing the divergence of the expectation value of the energy momentum tensor on the Cauchy horizon, evading in this way bothering quarrels concerning the choice of vacuum.
Fil: Fiorini, Franco Luis. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte; Argentina. Comisión Nacional de Energía Atómica. Gerencia del Área de Energía Nuclear. Instituto Balseiro; Argentina. Comisión Nacional de Energía Atómica. Centro Atómico Bariloche; Argentina
description As a consequence of the spacetime structure, defined by the tetrad field instead of the metric tensor alone, f(T) gravity seems to harbor its own chronology protection agency. When Gott´s pair of moving cosmic strings is considered, it is shown that the requirement of having a global parallelization --i.e. a global smooth field of tetrads-- drastically restrict the form of the tetrads on the junction surface between the two strings. The junction conditions on the tetrad field are satisfied only if the corresponding boosts needed to put the strings in motion are null on the matching surface. This seems to throw overboard Gott´s construction from the outset without the need of analyzing the divergence of the expectation value of the energy momentum tensor on the Cauchy horizon, evading in this way bothering quarrels concerning the choice of vacuum.
publishDate 2024
dc.date.none.fl_str_mv 2024-01
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
http://purl.org/coar/resource_type/c_6501
info:ar-repo/semantics/articulo
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/11336/230906
Fiorini, Franco Luis; Chronology Protection in f(T) Gravity: The Case of Gott’s Pair of Moving Cosmic Strings; MDPI; Universe; 10; 1; 1-2024; 1-10
2218-1997
CONICET Digital
CONICET
url http://hdl.handle.net/11336/230906
identifier_str_mv Fiorini, Franco Luis; Chronology Protection in f(T) Gravity: The Case of Gott’s Pair of Moving Cosmic Strings; MDPI; Universe; 10; 1; 1-2024; 1-10
2218-1997
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/url/https://www.mdpi.com/2218-1997/10/1/52
info:eu-repo/semantics/altIdentifier/doi/10.3390/universe10010052
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
https://creativecommons.org/licenses/by/2.5/ar/
eu_rights_str_mv openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by/2.5/ar/
dc.format.none.fl_str_mv application/pdf
application/pdf
dc.publisher.none.fl_str_mv MDPI
publisher.none.fl_str_mv MDPI
dc.source.none.fl_str_mv reponame:CONICET Digital (CONICET)
instname:Consejo Nacional de Investigaciones Científicas y Técnicas
reponame_str CONICET Digital (CONICET)
collection CONICET Digital (CONICET)
instname_str Consejo Nacional de Investigaciones Científicas y Técnicas
repository.name.fl_str_mv CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicas
repository.mail.fl_str_mv dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar
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score 13.070432

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