<?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>S0035-001X2010000100007</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Quasinormal frequencies of the Dirac field in the massless topological black hole]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[López-Ortega]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Instituto Politécnico Nacional Centro de Investigación en Ciencia Aplicada y Tecnología Avanzada Unidad Legaria]]></institution>
<addr-line><![CDATA[D.F. ]]></addr-line>
<country>México</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>02</month>
<year>2010</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>02</month>
<year>2010</year>
</pub-date>
<volume>56</volume>
<numero>1</numero>
<fpage>44</fpage>
<lpage>53</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0035-001X2010000100007&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0035-001X2010000100007&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0035-001X2010000100007&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Motivated by the recent computations of the quasinormal frequencies of higher dimensional black holes, we exactly calculate the quasinormal frequencies of the Dirac field, propagating in D-dimensional (D > 4) massless topological black hole. From the exact values of the quasinormal frequencies for the fermion and boson fields we discuss whether the recently proposed bound on the relaxation time of a perturbed thermodynamical system is satisfied in the D-dimensional massless topological black hole. Also we study the consequences of these results.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Motivados por el cálculo de las frecuencias cuasinormales de agujeros negros cuyo número de dimensiones D es mayor o igual a cuatro, en el presente artículo calculamos exactamente las frecuencias cuasinormales del campo de Dirac moviéndose en el agujero negro topológico de masa cero con D > 4. Usando los valores exactos de las frecuencias cuasinormales para los fermiones y bosones, discutimos si el límite, recientemente propuesto, sobre el tiempo de relajamiento de un sistema termodinámico perturbado se satisface en el agujero negro topológico de masa cero con D > 4. Adicionalmente estudiamos algunas consecuencias de estos resultados.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Quasinormal modes]]></kwd>
<kwd lng="en"><![CDATA[massless topological black hole]]></kwd>
<kwd lng="en"><![CDATA[Dirac field]]></kwd>
<kwd lng="en"><![CDATA[relaxation time]]></kwd>
<kwd lng="es"><![CDATA[Modos cuasinormales]]></kwd>
<kwd lng="es"><![CDATA[agujero negro topológico de masa cero]]></kwd>
<kwd lng="es"><![CDATA[campo de Dirac]]></kwd>
<kwd lng="es"><![CDATA[tiempo de relajamiento]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[ <p align="justify"><font face="verdana" size="4">Investigaci&oacute;n</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="center"><font face="verdana" size="4"><b>Quasinormal frequencies of the Dirac field in the massless topological black hole</b></font></p>     <p align="center"><font face="verdana" size="2">&nbsp;</font></p>     <p align="center"><font face="verdana" size="2"><b>A. L&oacute;pez&#150;Ortega</b></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><i>Centro de Investigaci&oacute;n en Ciencia Aplicada y Tecnolog&iacute;a Avanzada, </i><i>Unidad Legaria, Instituto Polit&eacute;cnico Nacional, Calzada Legaria # 694. Colonia Irrigaci&oacute;n, Miguel Hidalgo M&eacute;xico, D.F., 11500 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 1 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>Abstract</b></font></p>     <p align="justify"><font face="verdana" size="2">Motivated by the recent computations of the quasinormal frequencies of higher dimensional black holes, we exactly calculate the quasinormal frequencies of the Dirac field, propagating in <i>D</i>&#150;dimensional <i>(D <i><u>&gt;</u></i> </i>4) massless topological black hole. From the exact values of the quasinormal frequencies for the fermion and boson fields we discuss whether the recently proposed bound on the relaxation time of a perturbed thermodynamical system is satisfied in the D&#150;dimensional massless topological black hole. Also we study the consequences of these results.</font></p>     <p align="justify"><font face="verdana" size="2"><b>Keywords: </b>Quasinormal modes; massless topological black hole; Dirac field; relaxation time.</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">Motivados por el c&aacute;lculo de las frecuencias cuasinormales de agujeros negros cuyo n&uacute;mero de dimensiones <i>D </i>es mayor o igual a cuatro, en el presente art&iacute;culo calculamos exactamente las frecuencias cuasinormales del campo de Dirac movi&eacute;ndose en el agujero negro topol&oacute;gico de masa cero con <i>D <u>&gt;</u> </i>4. Usando los valores exactos de las frecuencias cuasinormales para los fermiones y bosones, discutimos si el l&iacute;mite, recientemente propuesto, sobre el tiempo de relajamiento de un sistema termodin&aacute;mico perturbado se satisface en el agujero negro topol&oacute;gico de masa cero con <i>D <i><u>&gt;</u></i> </i>4. Adicionalmente estudiamos algunas consecuencias de estos resultados.</font></p>     <p align="justify"><font face="verdana" size="2"><b>Descriptores: </b>Modos cuasinormales; agujero negro topol&oacute;gico de masa cero; campo de Dirac; tiempo de relajamiento.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2">PACS: 04.70.Bw; 04.50.Gh; 04.70.Dy</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/rmf/v56n1/v56n1a7.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>Acknowledgments</b></font></p>     <p align="justify"><font face="verdana" size="2">I thank Dr. C. E. Mora Ley and A. Tellez Felipe for their interest in this paper. This work was supported by CONACYT M&eacute;xico, SNI M&eacute;xico, EDI&#150;IPN, COFAA&#150;IPN, and Research Projects SIP&#150;20090952 and SIP&#150;20091344.</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. K.D. Kokkotas and B.G. Schmidt, <i>Living Rev. 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