<?xml version="1.0" encoding="ISO-8859-1"?><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<front>
<journal-meta>
<journal-id>1870-3542</journal-id>
<journal-title><![CDATA[Revista mexicana de física E]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. mex. fís. E]]></abbrev-journal-title>
<issn>1870-3542</issn>
<publisher>
<publisher-name><![CDATA[Sociedad Mexicana de Física]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1870-35422010000100011</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[El modelo BEG con interacciones de largo alcance: propiedades estáticas y dinámicas]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ramírez-Hernández]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,University of Wisconsin-Madison Department of Chemical and Biological Engineering ]]></institution>
<addr-line><![CDATA[Madison Wisconsin]]></addr-line>
<country>USA</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>06</month>
<year>2010</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>06</month>
<year>2010</year>
</pub-date>
<volume>56</volume>
<numero>1</numero>
<fpage>92</fpage>
<lpage>97</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1870-35422010000100011&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1870-35422010000100011&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1870-35422010000100011&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[En este trabajo estudiamos algunas propiedades estáticas y dinámicas del modelo introducido por Blume, Emery y Griffiths, considerando interacciones de largo alcance. Éste es un modelo exactamente soluble tanto en el ensemble canónico como en el microcanónico, calculamos la función de partición canónica y a través de ésta las líneas de transición de fase. Derivamos la ecuación cinética para la evolución temporal de la magnetización a través de la ecuación maestra del sistema bajo la dinámica de Glauber, estudiando las propiedades de esta ecuación, nos enfocamos en el comportamiento del sistema como nos aproximamos al punto crítico, observando el fenómeno de alentamiento crítico. Así, este modelo representa un ejemplo bastante interesante donde todas estas propiedades (estáticas y dinámicas) pueden estudiarse de manera exacta, y que presenta un diagrama de fases más rico que el tradicional modelo de Ising, representando un ejemplo con mucho potencial para cursos de física estadística.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[We study the static and dynamic properties of the BEG model with long-range interactions. This model is exactly solvable both in the canonical and in the microcanonical ensembles, we obtain the canonical partition function and the phase transition lines. Also, we study the dynamic properties through the master equation within the Glauber dynamics. We have derived and studied the kinetic equation for the magnetization, we observed the critical slowing down phenomenon near the critical point. Thus, this model represents a very interesting example, where it is possible to study all these phenomena, moreover it has a richer phase diagram than the Ising model, so it can be a nice example as part of the courses of statistical physics.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Interacciones de largo alcance]]></kwd>
<kwd lng="es"><![CDATA[transiciones de fase]]></kwd>
<kwd lng="es"><![CDATA[ecuación maestra]]></kwd>
<kwd lng="en"><![CDATA[Long-range interactions]]></kwd>
<kwd lng="en"><![CDATA[phase transitions]]></kwd>
<kwd lng="en"><![CDATA[master equation]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[ <p align="justify"><font face="verdana" size="4">Ense&ntilde;anza</font></p>     <p align="center"><font face="verdana" size="2">&nbsp;</font></p>     <p align="center"><font face="verdana" size="4"><b>El modelo BEG con interacciones de largo alcance: propiedades est&aacute;ticas y din&aacute;micas</b></font></p>     <p align="center"><font face="verdana" size="2">&nbsp;</font></p>     <p align="center"><font face="verdana" size="2"><b>A. Ram&iacute;rez&#150;Hern&aacute;ndez</b></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><i>Department of Chemical and Biological Engineering, University of Wisconsin&#150;Madison, Madison, Wisconsin 53706, USA, e&#150;mail: </i><a href="mailto:ramirezherna@wisc.edu">ramirezherna@wisc.edu</a>, <a href="mailto:abelardo.rhz@gmail.com">abelardo.rhz@gmail.com</a>.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2">Recibido el 7 de septiembre de 2009    <br>   Aceptado el 1 de diciembre de 2009</font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Resumen</b></font></p>     <p align="justify"><font face="verdana" size="2">En este trabajo estudiamos algunas propiedades est&aacute;ticas y din&aacute;micas del modelo introducido por Blume, Emery y Griffiths, considerando interacciones de largo alcance. &Eacute;ste es un modelo exactamente soluble tanto en el ensemble can&oacute;nico como en el microcan&oacute;nico, calculamos la funci&oacute;n de partici&oacute;n can&oacute;nica y a trav&eacute;s de &eacute;sta las l&iacute;neas de transici&oacute;n de fase. Derivamos la ecuaci&oacute;n cin&eacute;tica para la evoluci&oacute;n temporal de la magnetizaci&oacute;n a trav&eacute;s de la ecuaci&oacute;n maestra del sistema bajo la din&aacute;mica de Glauber, estudiando las propiedades de esta ecuaci&oacute;n, nos enfocamos en el comportamiento del sistema como nos aproximamos al punto cr&iacute;tico, observando el fen&oacute;meno de alentamiento cr&iacute;tico. As&iacute;, este modelo representa un ejemplo bastante interesante donde todas estas propiedades (est&aacute;ticas y din&aacute;micas) pueden estudiarse de manera exacta, y que presenta un diagrama de fases m&aacute;s rico que el tradicional modelo de Ising, representando un ejemplo con mucho potencial para cursos de f&iacute;sica estad&iacute;stica.</font></p>     <p align="justify"><font face="verdana" size="2"><b>Descriptores:</b> Interacciones de largo alcance; transiciones de fase; ecuaci&oacute;n maestra.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Abstract</b></font></p>     <p align="justify"><font face="verdana" size="2">We study the static and dynamic properties of the BEG model with long&#150;range interactions. This model is exactly solvable both in the canonical and in the microcanonical ensembles, we obtain the canonical partition function and the phase transition lines. Also, we study the dynamic properties through the master equation within the Glauber dynamics. We have derived and studied the kinetic equation for the magnetization, we observed the critical slowing down phenomenon near the critical point. Thus, this model represents a very interesting example, where it is possible to study all these phenomena, moreover it has a richer phase diagram than the Ising model, so it can be a nice example as part of the courses of statistical physics.</font></p>     <p align="justify"><font face="verdana" size="2"><b>Keywords:</b> Long&#150;range interactions; phase transitions; master equation.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2">PACS: 64.60.De; 64.60.&#150;i; 64.70.qj</font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><a href="/pdf/rmfe/v56n1/v56n1a11.pdf" target="_blank">DESCARGAR ART&Iacute;CULO EN FORMATO PDF</a></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Agradecimientos</b></font></p>     <p align="justify"><font face="verdana" size="2">Agradezco al CONACYT por el apoyo brindado a trav&eacute;s de la beca posdoctoral 92637. Tambi&eacute;n deseo agradecer al Dr. Saul Hern&aacute;ndez y a la Dra. Consuelo Garc&iacute;a por la lectura y comentarios sobre este manuscrito, as&iacute; como a los &aacute;rbitros por las cr&iacute;ticas y sugerencias.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Referencias</b></font></p>     <!-- ref --><p align="justify"><font face="verdana" size="2">1. L. Reichl, <i>A Modern Course in Statistical Mechanics </i>(Second Edition Wiley Interscience 1998).</font>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=8452399&pid=S1870-3542201000010001100001&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p align="justify"><font face="verdana" size="2">2. R.J. Glauber, <i>J. Math. 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