{"id":59509,"date":"2018-03-09T22:47:21","date_gmt":"2018-03-09T22:47:21","guid":{"rendered":"https:\/\/www.deberes.net\/tesis\/sin-categoria\/constraining-interacting-cosmological-models-with-observational-data\/"},"modified":"2018-03-09T22:47:21","modified_gmt":"2018-03-09T22:47:21","slug":"constraining-interacting-cosmological-models-with-observational-data","status":"publish","type":"post","link":"https:\/\/www.deberes.net\/tesis\/fisica\/constraining-interacting-cosmological-models-with-observational-data\/","title":{"rendered":"Constraining interacting cosmological models with observational data"},"content":{"rendered":"<h2>Tesis doctoral de <strong> Germ\u00e1n Olivares Pulido <\/strong><\/h2>\n<p>In 1998, measurements of the luminosity distance of a handful of supernovae type ia hinted at an accelerated expansion of the present universe. Since then, several observational data sets including cmb and lss lent further support to the idea of a spatially flat universe dominated by a cosmological constant, lambda, with 70% of the total energy density and cold dark matter energy density 3% of it. Although the lambda cdm model fits reasonably well all observational data it faces two serious theoretical problems. In the first place, a fine-tuning problem. The observed cosmological constant is about 121  times smaller than the value predicted by quantum field theory. This is why scalar fields were proposed as an alternative to the cosmological constant; they naturally arises in particle physics including string theory. Up to now, a wide variety of scalar fields dark energy models have been suggested. These include quintessence, phantoms, k-essence, tachyon, ghost condensates and dilatonic dark energy amongst many others. Quintessence scalar fields present energy scales compatible with the energy scale of particle physics. This may help alleviate the severe fine-tuning problem of the cosmological constant.  in the second place, it appears rather unnatural that the densities of two components, cold dark matter and dark energy, that evolve so differently  with expansion happen to be of  the same order precisely today. This is the coincidence problem. in order to solve, or  alleviate it, models featuring an interaction between dark energy and matter were advanced proposed.In chapter 2 we studied the interacting quintessence model of chimento et al. The interaction is proposed from a phenomenological viewpoint. The dark energy decays into cold dark matter in such a way that their ratio remains constant during the late epoch of accelerated expansion, thus substantially alleviating the coincidence problem. This kind of solutions, known as scaling solutions prove useful<\/p>\n<p>&nbsp;<\/p>\n<h3>Datos acad\u00e9micos de la tesis doctoral \u00ab<strong>Constraining interacting cosmological models with observational data<\/strong>\u00ab<\/h3>\n<ul>\n<li><strong>T\u00edtulo de la tesis:<\/strong>\u00a0 Constraining interacting cosmological models with observational data <\/li>\n<li><strong>Autor:<\/strong>\u00a0 Germ\u00e1n Olivares Pulido <\/li>\n<li><strong>Universidad:<\/strong>\u00a0 Aut\u00f3noma de barcelona<\/li>\n<li><strong>Fecha de lectura de la tesis:<\/strong>\u00a0 29\/06\/2007<\/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>Diego Pav\u00f3n Coloma<\/li>\n<\/ul>\n<\/li>\n<li><strong>Tribunal<\/strong>\n<ul>\n<li>Presidente del tribunal: Jes\u00fas Mart\u00edn mart\u00edn <\/li>\n<li>enrique Gazta\u00f1aga (vocal)<\/li>\n<li>Emilio Elizalde (vocal)<\/li>\n<li>ruth Lazcoz s\u00e1ez (vocal)<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Tesis doctoral de Germ\u00e1n Olivares Pulido In 1998, measurements of the luminosity distance of a handful of supernovae type ia [&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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