{"id":38863,"date":"2018-03-09T09:38:39","date_gmt":"2018-03-09T09:38:39","guid":{"rendered":"https:\/\/www.deberes.net\/tesis\/sin-categoria\/theoretical-aspects-concerning-separability-matching-and-matter-contents-of-inhomo-geneities-in-cosmology\/"},"modified":"2018-03-09T09:38:39","modified_gmt":"2018-03-09T09:38:39","slug":"theoretical-aspects-concerning-separability-matching-and-matter-contents-of-inhomo-geneities-in-cosmology","status":"publish","type":"post","link":"https:\/\/www.deberes.net\/tesis\/fisica\/theoretical-aspects-concerning-separability-matching-and-matter-contents-of-inhomo-geneities-in-cosmology\/","title":{"rendered":"Theoretical aspects concerning separability, matching and matter contents of inhomo geneities in cosmology."},"content":{"rendered":"<h2>Tesis doctoral de <strong> Raul Vera Jimenez <\/strong><\/h2>\n<p>El prop\u00f3sito de esta memoria es proseguir con las generalizaciones de los t\u00edpicos modelos cosmol\u00f3gicos espacialmente is\u00f3tropos y homog\u00e9neos (flrw) siguiendo dos vertientes: modelos inhomog\u00e9neos, por un lado, y la inclusi\u00f3n de inhomogeneidades en universos flrw, por otro. En cuanto al primer punto, se obtiene una clasificaci\u00f3n de modelos de fluido perfecto que admiten un grupo bidimensional abeliano de isometr\u00edas actuando sobre superficies espaciales y tales que la m\u00e9trica se puede escribir en forma diagonal y separable, junto con un m\u00e9todo sistem\u00e1tico para obtenerlas. Uno de los resultados a destacar es la obtenci\u00f3n y posterior estudio de los primeros (y \u00fanicos hasta la fecha) modelos cosmolgicos expl\u00edcitos pulverulentos inhomog\u00e9neos algebraicamente generales. El m\u00e9todo de resoluci\u00f3n permite la existencia de regiones en el espacio-tiempo con diferente tipo de contenido material. Este problema se ataca de forma completamente general describiendo la descomposici\u00f3n y estructura de cualqueir espacio-tiempo seg\u00fan cual sea en cada uno de sus puntos el tipo algebraico del tensor de energ\u00eda-momento.  en cuanto a la segunda vertiente se estudia de forma completamente general el enlace de espacio-tiempos con simetr\u00eda cil\u00edndrica a trav\u00e9s de una hipersuperficie arbitraria que preserva dicha simetr\u00eda. Una particularizaci\u00f3n de estos enlaces, a saber, el que contiene una regi\u00f3n flrw como una de sus partes, permite probar la imposibilidad de traspasar el modelo de einstein-straus (que es de simetr\u00eda esf\u00e9rica) a otro an\u00e1logo con simetr\u00eda cil\u00edndrica, sugiriendo la inestabilidad de dicho tipo de modelos para describir la influencia de la expansi\u00f3n del universo en cavidades est\u00e1ticas.<\/p>\n<p>&nbsp;<\/p>\n<h3>Datos acad\u00e9micos de la tesis doctoral \u00ab<strong>Theoretical aspects concerning separability, matching and matter contents of inhomo geneities in cosmology.<\/strong>\u00ab<\/h3>\n<ul>\n<li><strong>T\u00edtulo de la tesis:<\/strong>\u00a0 Theoretical aspects concerning separability, matching and matter contents of inhomo geneities in cosmology. <\/li>\n<li><strong>Autor:<\/strong>\u00a0 Raul Vera Jimenez <\/li>\n<li><strong>Universidad:<\/strong>\u00a0 Barcelona<\/li>\n<li><strong>Fecha de lectura de la tesis:<\/strong>\u00a0 27\/11\/1998<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<h3>Direcci\u00f3n y tribunal<\/h3>\n<ul>\n<li><strong>Director de la tesis<\/strong>\n<ul>\n<li>Jos\u00e9 Mar\u00eda Mart\u00edn Senovilla<\/li>\n<\/ul>\n<\/li>\n<li><strong>Tribunal<\/strong>\n<ul>\n<li>Presidente del tribunal: Jes\u00fas Martin martin <\/li>\n<li>fransesc Fayos vall\u00e9s (vocal)<\/li>\n<li>jaume Carot giner (vocal)<\/li>\n<li>graham Hall (vocal)<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Tesis doctoral de Raul Vera Jimenez El prop\u00f3sito de esta memoria es proseguir con las generalizaciones de los t\u00edpicos modelos [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center 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