<?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>S0035-001X2007000800009</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Gowdy Cosmological Models from Stringy Black Holes]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Cisneros-Pérez]]></surname>
<given-names><![CDATA[T]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Herrera-Aguilar]]></surname>
<given-names><![CDATA[A]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Mejía-Ambriz]]></surname>
<given-names><![CDATA[J.C]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rojas-Macías]]></surname>
<given-names><![CDATA[V]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Universidad Michoacana de San Nicolás de Hidalgo Escuela de Ciencias Físico-Matemáticas ]]></institution>
<addr-line><![CDATA[Morelia Mich]]></addr-line>
<country>México</country>
</aff>
<aff id="A02">
<institution><![CDATA[,Universidad Michoacana de San Nicolás de Hidalgo Instituto de Física y Matemáticas ]]></institution>
<addr-line><![CDATA[Morelia Mich]]></addr-line>
<country>México</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>02</month>
<year>2007</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>02</month>
<year>2007</year>
</pub-date>
<volume>53</volume>
<fpage>63</fpage>
<lpage>67</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0035-001X2007000800009&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0035-001X2007000800009&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0035-001X2007000800009&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[In the framework of 4D Einstein-Maxwell Dilaton-Axion theory we show how to obtain a family of both unpolarized and polarized S¹ x S² Gowdy cosmological models endowed with nontrivial axion, dilaton and electromagnetic fields from a solitonic rotating black hole-type solution by interchanging the r and t coordinates in the region located between the horizons of the black hole configuration. We also obtain a family of Kantowski-Sachs cosmologies with topology R¹ x S² from the polarized Gowdy cosmological models by decompactifying one of the compact dimensions.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[En el marco de la teoría tetradimensional de Einstein-Maxwell con dilaton y axión se muestra cómo obtener una familia de modelos cosmológicos de Gowdy (polarizados y no polarizados) con topología S¹ x S². Dichos modelos cosmológicos se obtienen a partir de una solución solitónica de tipo agujero negro rotatorio mediante el intercambio de las coordendas r y t en la región comprendida entre los horizontes del agujero negro y contempla campos dilatonico, axiónico y electromagnético no triviales. A su vez, a partir de las cosmologías de Gowdy polarizadas se obtiene una subclase de modelos cosmológicos de tipo Kantowski-Sachs con topología R¹ x S² mediante la decompactificación de una de las coordenadas compactas.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Gowdy and Kantowski-Sachs cosmological models]]></kwd>
<kwd lng="en"><![CDATA[rotating black holes]]></kwd>
<kwd lng="en"><![CDATA[low-energy string theory]]></kwd>
<kwd lng="en"><![CDATA[coordinate transformation]]></kwd>
<kwd lng="es"><![CDATA[Cosmologías de tipo Gowdy y Kantowski-Sachs]]></kwd>
<kwd lng="es"><![CDATA[agujeros negros rotatorios]]></kwd>
<kwd lng="es"><![CDATA[teoría de cuerdas a bajas energías]]></kwd>
<kwd lng="es"><![CDATA[transformación de coordenadas]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[ <p align="center"><font face="verdana" size="4"><b>Gowdy Cosmological Models from Stringy Black Holes</b></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="center"><font face="verdana" size="2"><b>T. Cisneros&#150;P&eacute;rez&ordf;, A. Herrera&#150;Aguilar<sup>b</sup>, J.C. Mej&iacute;a&#150;Ambriz&ordf;, and V. Rojas&#150;Mac&iacute;as&ordf;</b></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><i>&ordf; Escuela de Ciencias F&iacute;sico&#150;Matem&aacute;ticas, </i><i>Universidad Michoacana de San Nicol&aacute;s de Hidalgo, </i><i>Edificio B, Ciudad Universitaria, Morelia, Mich. 58040, M&eacute;xico.</i></font></p>     <p align="justify"><font face="verdana" size="2"><i><sup>b </sup>Instituto de F&iacute;sica y Matem&aacute;ticas, </i><i>Universidad Michoacana de San Nicol&aacute;s de Hidalgo, </i><i>Edificio C&#151;3, Ciudad Universitaria, Morelia, Mich. 58040, M&eacute;xico.</i></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2">Recibido el 18 de julio de 2005    <br> Aceptado el 14 de marzo de 2005</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2"><b>Abstract</b></font></p>     <p align="justify"><font face="verdana" size="2">In the framework of 4D Einstein&#150;Maxwell Dilaton&#150;Axion theory we show how to obtain a family of both unpolarized and polarized <i>S<sup>1</sup> </i>x <i>S<sup>2 </sup></i>Gowdy cosmological models endowed with nontrivial axion, dilaton and electromagnetic fields from a solitonic rotating black hole&#150;type solution by interchanging the <i>r </i>and <i>t </i>coordinates in the region located between the horizons of the black hole configuration. We also obtain a family of Kantowski&#150;Sachs cosmologies with topology <i>R<sup>1</sup> </i>x <i>S<sup>2</sup> </i>from the polarized Gowdy cosmological models by decompactifying one of the compact dimensions.</font></p>     <p align="justify"><font face="verdana" size="2"><b>Keywords: </b>Gowdy and Kantowski&#150;Sachs cosmological models; rotating black holes; low&#150;energy string theory; coordinate transformation.</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>     <p align="justify"><font face="verdana" size="2">En el marco de la teor&iacute;a tetradimensional de Einstein&#150;Maxwell con dilaton y axi&oacute;n se muestra c&oacute;mo obtener una familia de modelos cosmol&oacute;gicos de Gowdy (polarizados y no polarizados) con topolog&iacute;a <i>S<sup>1</sup> x S<sup>2</sup>. </i>Dichos modelos cosmol&oacute;gicos se obtienen a partir de una soluci&oacute;n solit&oacute;nica de tipo agujero negro rotatorio mediante el intercambio de las coordendas <i>r </i>y <i>t </i>en la regi&oacute;n comprendida entre los horizontes del agujero negro y contempla campos dilatonico, axi&oacute;nico y electromagn&eacute;tico no triviales. A su vez, a partir de las cosmolog&iacute;as de Gowdy polarizadas se obtiene una subclase de modelos cosmol&oacute;gicos de tipo Kantowski&#150;Sachs con topolog&iacute;a <i>R<sup>1</sup> </i>x <i>S<sup>2</sup> </i>mediante la decompactificaci&oacute;n de una de las coordenadas compactas.</font></p>     <p align="justify"><font face="verdana" size="2"><b>Descriptores: </b>Cosmolog&iacute;as de tipo Gowdy y Kantowski&#150;Sachs; agujeros negros rotatorios; teor&iacute;a de cuerdas a bajas energ&iacute;as; transformaci&oacute;n de coordenadas.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2">PACS: 98.80.Hw, 04.20.Jb, 04.50.+h, 11.25.M</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2"><a href="/pdf/rmf/v53s2/v53s2a9.pdf">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>Acknowledgments</b></font></p>     <p align="justify"><font face="verdana" size="2">One of the authors (AHA) is extremely grateful to the Theoretical Physics Department of the Aristotle University of Thessaloniki and, especially, to Prof. J.E. Paschalis for useful discussions and for providing a stimulating atmosphere while part of this work was being done. He also thanks Prof. O. Obreg&oacute;n for fruitful discussions and Prof. H. Quevedo for an illuminating correspondence on the subject. This research was supported by grants CIC&#150;UMSNH&#150;4 and CONACYT&#150;42064&#150;F.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>References</b></font></p>     <!-- ref --><p align="justify"><font face="verdana" size="2">1. F.   Quevedo,   "Lectures  on  string/brane  cosmology",   hep&#150;th/0210292;    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=8338241&pid=S0035-001X200700080000900001&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --> M. Gasperini, and G. Veneziano, <i>Phys. 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