{"id":65859,"date":"2008-03-07T00:00:00","date_gmt":"2008-03-07T00:00:00","guid":{"rendered":"https:\/\/www.deberes.net\/tesis\/sin-categoria\/infrared-modifications-of-gravity\/"},"modified":"2008-03-07T00:00:00","modified_gmt":"2008-03-07T00:00:00","slug":"infrared-modifications-of-gravity","status":"publish","type":"post","link":"https:\/\/www.deberes.net\/tesis\/barcelona\/infrared-modifications-of-gravity\/","title":{"rendered":"Infrared modifications of gravity"},"content":{"rendered":"<h2>Tesis doctoral de <strong> Diego Blas Temi\u00f1o <\/strong><\/h2>\n<p>El prop\u00f3sito de la tesis es el estudio las posibles modificaciones de la relatividad general a distancias largas. La motivaci\u00f3n de dicho estudio se debe tanto a motivos te\u00f3ricos (la rigidez de la relatividad general en comparaci\u00f3n con    el resto de interacciones) como a experimentales (la explicaci\u00f3n de la actual expansi\u00f3n del universo).  en la tesis nos hemos centrado en dos puntos principales: la gravedad unimodular y la bigravedad.   la primera parte de la tesis consiste en el estudio de las teor\u00edas linearizadas de gravitones donde encontramos las posibles teor\u00edas de gravedad masiva que no sufren de inestabilidades. Adem\u00e1s, para el caso sin masa hemos encontrado un caso diferente al proveniente de la relatividad general, si bien con id\u00e9nticas predicciones f\u00edsicas. Tambi\u00e9n hemos extendido este resultado a otras teor\u00edas de   spin alto para fermiones.  en la segunda parte nos centramos en aspectos no-lineales. En primer lugar, para el caso sin masa, enontramos una alternativa a la relatividad general con id\u00e9nticas predicciones excepto para la constante cosmol\u00f3gica: la gravedad unimodular. Intentamos, sin \u00e9xito, demostrar su unicidad.  para el caso de gravedad masiva nos hemos centrado en la bigravedad como modelo no-lineal. Hemos estudiado tanto aspectos globales como locales. En lo que se refiere a las perturbaciones, hemos encontrado que la bigravedad puede dar lugar a modificaciones de relativad general consistentes.<\/p>\n<p>&nbsp;<\/p>\n<h3>Datos acad\u00e9micos de la tesis doctoral \u00ab<strong>Infrared modifications of gravity<\/strong>\u00ab<\/h3>\n<ul>\n<li><strong>T\u00edtulo de la tesis:<\/strong>\u00a0 Infrared modifications of gravity <\/li>\n<li><strong>Autor:<\/strong>\u00a0 Diego Blas Temi\u00f1o <\/li>\n<li><strong>Universidad:<\/strong>\u00a0 Barcelona<\/li>\n<li><strong>Fecha de lectura de la tesis:<\/strong>\u00a0 03\/07\/2008<\/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>Jaume Garriga Torres<\/li>\n<\/ul>\n<\/li>\n<li><strong>Tribunal<\/strong>\n<ul>\n<li>Presidente del tribunal: enrique Alvarez vazquez <\/li>\n<li>Manuel Asorey carballeira (vocal)<\/li>\n<li>cedric Deffayet (vocal)<\/li>\n<li>michele Redi (vocal)<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Tesis doctoral de Diego Blas Temi\u00f1o El prop\u00f3sito de la tesis es el estudio las posibles modificaciones de la relatividad [&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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