<?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>0035-001X</journal-id>
<journal-title><![CDATA[Revista mexicana de física]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. mex. fis.]]></abbrev-journal-title>
<issn>0035-001X</issn>
<publisher>
<publisher-name><![CDATA[Sociedad Mexicana de Física]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0035-001X2007001000018</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Cosmología de Einstein-Rosen]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[López Suárez]]></surname>
<given-names><![CDATA[L.A]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Centro de Investigación y de Estudios Avanzados del IPN Departamento de Física ]]></institution>
<addr-line><![CDATA[México D.F]]></addr-line>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>08</month>
<year>2007</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>08</month>
<year>2007</year>
</pub-date>
<volume>53</volume>
<fpage>102</fpage>
<lpage>105</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0035-001X2007001000018&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0035-001X2007001000018&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0035-001X2007001000018&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Se realiza el estudio de una solución de las ecuaciones acopladas de la teoría conocida como Einstein-Maxwell-Dilaton-Axion (EMDA) con el fin de obtener información sobre el acoplamiento de los campos escalares con el campo de norma U (1). Para obtener una solución a las ecuaciones de EMDA se considera una métrica que admita dos vectores de Killing espaciales, posteriormente dicha métrica se transforma en una metrica de Einstein-Rosen, en la cual se puede interpretar el espacio-tiempo como: espacio cilíndrico, ondas planas o modelo cosmológico. Se estudia el modelo cosmológico en cuanto a su cinemática, posibles singularidades y el comportamiento asintótico de los campos y de la métrica, observando que la métrica, cerca de la singularidad tiene un comportamiento llamado término de velocidad asintoticamente dominante, AVDT (Asymptotically velocity-term dominated).]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[We carry out the study of a solution of the coupled equations of the theory known as Einstein-Maxwell-Dilaton-Axion (EMDA) with the purpose of obtaining information of the coupling of the scalar fields with the U(1)gauge fields. To obtain a solution of the equations of EMDA we consider a metric that possesses two space-like Killing vectors, later the metric is transformed into an Einstein-Rosen metric where can interpret the space-time as either: a cylindrical space, a plane wave space, or a cosmological model. The cosmological model is studied in its kinematics, possible singularities, and the asymptotic behavior of the fields and the metric. We observe that the metric near the singularity has a behavior of the type "asymptotically velocity-term dominated'" (AVDT).]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Cosmologías inhomogeneas]]></kwd>
<kwd lng="es"><![CDATA[singularidades]]></kwd>
<kwd lng="en"><![CDATA[Inhomogeneous cosmologies]]></kwd>
<kwd lng="en"><![CDATA[singularities]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[ <p align="center"><font face="verdana" size="4"><b>Cosmolog&iacute;a de Einstein&#151;Rosen</b></font></p>     <p align="center"><font face="verdana" size="2">&nbsp;</font></p>     <p align="center"><font face="verdana" size="2"><b>L.A. L&oacute;pez Su&aacute;rez</b></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><i>Departamento de F&iacute;sica, Centro de Investigaci&oacute;n y de Estudios Avanzados del IPN, Apartado Postal 14&#150;740, 07000, M&eacute;xico D.F. e&#150;mail: <a href="mailto:lalopez@fis.cinvestav.mx" target="_blank">lalopez@fis.cinvestav.mx</a></i></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2">Recibido el 1 de mayo de 2006    <br>   Aceptado el 1 de noviembre de 2006</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Resumen</b></font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">Se realiza el estudio de una soluci&oacute;n de las ecuaciones acopladas de la teor&iacute;a conocida como Einstein&#151;Maxwell&#151;Dilaton&#151;Axion (EMDA) con el fin de obtener informaci&oacute;n sobre el acoplamiento de los campos escalares con el campo de norma <i>U</i> (1)<i>. </i>Para obtener una soluci&oacute;n a las ecuaciones de EMDA se considera una m&eacute;trica que admita dos vectores de Killing espaciales, posteriormente dicha m&eacute;trica se transforma en una metrica de Einstein&#151;Rosen, en la cual se puede interpretar el espacio&#151;tiempo como: espacio cil&iacute;ndrico, ondas planas o modelo cosmol&oacute;gico. Se estudia el modelo cosmol&oacute;gico en cuanto a su cinem&aacute;tica, posibles singularidades y el comportamiento asint&oacute;tico de los campos y de la m&eacute;trica, observando que la m&eacute;trica, cerca de la singularidad tiene un comportamiento llamado t&eacute;rmino de velocidad asintoticamente dominante, AVDT (Asymptotically velocity&#150;term dominated).</font></p>     <p align="justify"><font face="verdana" size="2"><b>Descriptores: </b>Cosmolog&iacute;as inhomogeneas; singularidades.</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 carry out the study of a solution of the coupled equations of the theory known as Einstein&#150;Maxwell&#150;Dilaton&#150;Axion (EMDA) with the purpose of obtaining information of the coupling of the scalar fields with the <i>U</i>(1)gauge fields. To obtain a solution of the equations of EMDA we consider a metric that possesses two space&#150;like Killing vectors, later the metric is transformed into an Einstein&#150;Rosen metric where can interpret the space&#150;time as either: a cylindrical space, a plane wave space, or a cosmological model. The cosmological model is studied in its kinematics, possible singularities, and the asymptotic behavior of the fields and the metric. We observe that the metric near the singularity has a behavior of the type "asymptotically velocity&#150;term dominated'" (AVDT).</font></p>     <p align="justify"><font face="verdana" size="2"><b>Keywords: </b>Inhomogeneous cosmologies; singularities.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2">PACS: 98.88.&#150;k; 02.40.Xx; 11.25.&#150;w</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><a href="/pdf/rmf/v53s4/v53s4a18.pdf">DESCARGAR ART&Iacute;CULO EN FORMATO PDF</a></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>Referencias</b></font></p>     <!-- ref --><p align="justify"><font face="verdana" size="2">1. A. Shapere, S. Trivedi, and F. Wilczek, <i>Mod Phys. Lett. A </i><b>6</b> (1991) 2677.</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=8341180&pid=S0035-001X200700100001800001&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. N. Bret&oacute;n, <i>Exact Solution in Einstein&#150;Maxwell&#150;Dilaton&#150;Axion Theory, </i>Proceedings of ERE &#151;99, Recent Developments in Gravitation, Ed. by J. Ib&aacute;&ntilde;ez, Univ. Pa&iacute;s Vasco, p 179, Espa&ntilde;a (2000).</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=8341181&pid=S0035-001X200700100001800002&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">3. H. Stephany, D. Kramer, M. MaCallum, C. Hoenselaers, and E. Herlt, <i>Exact Solutions to Einstein's Field Equations, </i>Second Edition (Cambridge University Press, 2003).</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=8341182&pid=S0035-001X200700100001800003&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">4. R.M. Wald, <i>General Relativity </i>(The University of Chicago Press 1984).</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=8341183&pid=S0035-001X200700100001800004&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">5. M. Narita, T. Torii, and K. Maeda, <i>Class and Quantum Gravity </i><b>17</b> (2000) 4597.</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=8341184&pid=S0035-001X200700100001800005&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --> ]]></body><back>
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