{"id":38802,"date":"1998-12-11T00:00:00","date_gmt":"1998-12-11T00:00:00","guid":{"rendered":"https:\/\/www.deberes.net\/tesis\/sin-categoria\/modelos-de-spines-antiferromagnetismo-y-grupo-de-renormalizacion\/"},"modified":"1998-12-11T00:00:00","modified_gmt":"1998-12-11T00:00:00","slug":"modelos-de-spines-antiferromagnetismo-y-grupo-de-renormalizacion","status":"publish","type":"post","link":"https:\/\/www.deberes.net\/tesis\/fisica\/modelos-de-spines-antiferromagnetismo-y-grupo-de-renormalizacion\/","title":{"rendered":"Modelos de spines, antiferromagnetismo y grupo de renormalizacion."},"content":{"rendered":"<h2>Tesis doctoral de <strong> Jos\u00e9 Manuel Carmona Martinez <\/strong><\/h2>\n<p>El tema general de la tesis es el estudio de modelos de spines y su aplicaci\u00f3n a distintos tipos de problemas en mec\u00e1nica estad\u00edstica y teor\u00eda cu\u00e1ntica de campos. La tesis se divide en tres partes. En la primera parte se consideran dos aspectos muy concretos y poco explorados del modelo de ising. En primer lugar, la caracterizaci\u00f3n de la transici\u00f3n de fase presente en el modelo en una dimensi\u00f3n fraccionaria, intermedia entre uno (a la cual no existe transici\u00f3n) y dos (la bien conocida transici\u00f3n del modelo de ising bidimensional), utilizando t\u00e9cnicas num\u00e9ricas de monte carlo y an\u00e1lisis de tama\u00f1o finito. La conclusi\u00f3n m\u00e1s importante es que existen grandes evidencias de que la dimensi\u00f3n de hausdorff es la que controla las relaciones de hiperescala entre exponentes cr\u00edticos. En segundo lugar, se realiza el estudio del modelo de ising bajo la ligadura de magnetizaci\u00f3n constante, observ\u00e1ndose que el sistema presenta un comportamiento muy diferente al del modelo usual con campo magn\u00e9tico constante. en particular, la transici\u00f3n de primer orden del diagrama (densidad, temperatura) se convierte aqu\u00ed en una transici\u00f3n de segundo orden, lo cual puede entenderse cualitativamente. Estos resultados pueden aplicarse a la explicaci\u00f3n de los procesos que tienen lugar en la fragmentaci\u00f3n de la materia nuclear.  en la segunda parte de la tesis se expone la relaci\u00f3n que existe entre la mec\u00e1nica estad\u00edstica y la teor\u00eda cu\u00e1ntica de campos, expresada te\u00f3ricamente a trav\u00e9s del grupo de renomalizaci\u00f3n (gr). Un enfoque moderno del gr es el gr \u00abexacto\u00bb o de wegner-haughton, que permite seguir la evoluci\u00f3n a un gran conjunto de acoplos durante el flujo de gr. En particular, se desarrolla esta t\u00e9cnica para comparar cualitativa y cuantitativamente el flujo de gr para dos regularizaciones distintas de la teor\u00eda de campos escalar en dos dimensiones, obteniendo una sencilla correspondencia en el ultravioleta que proporcio<\/p>\n<p>&nbsp;<\/p>\n<h3>Datos acad\u00e9micos de la tesis doctoral \u00ab<strong>Modelos de spines, antiferromagnetismo y grupo de renormalizacion.<\/strong>\u00ab<\/h3>\n<ul>\n<li><strong>T\u00edtulo de la tesis:<\/strong>\u00a0 Modelos de spines, antiferromagnetismo y grupo de renormalizacion. <\/li>\n<li><strong>Autor:<\/strong>\u00a0 Jos\u00e9 Manuel Carmona Martinez <\/li>\n<li><strong>Universidad:<\/strong>\u00a0 Zaragoza<\/li>\n<li><strong>Fecha de lectura de la tesis:<\/strong>\u00a0 12\/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>Alfonso Tarancon Lafita<\/li>\n<\/ul>\n<\/li>\n<li><strong>Tribunal<\/strong>\n<ul>\n<li>Presidente del tribunal:  Alonso buj Jos\u00e9 Luis <\/li>\n<li>jean Richert (vocal)<\/li>\n<li>rolf Tarrach siegel (vocal)<\/li>\n<li>janos Polonyi (vocal)<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Tesis doctoral de Jos\u00e9 Manuel Carmona Martinez El tema general de la tesis es el estudio de modelos de spines [&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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