<?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>S0035-001X2003000300013</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Obtaining the gravitational force corresponding to arbitrary spacetimes. The Schwarzschild's case]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Soldovieri]]></surname>
<given-names><![CDATA[T.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Muñoz S.]]></surname>
<given-names><![CDATA[A.G.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Universidad del Zulia Facultad de Ciencias Departamento de Física]]></institution>
<addr-line><![CDATA[Maracaibo Zulia]]></addr-line>
<country>Venezuela</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2003</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2003</year>
</pub-date>
<volume>49</volume>
<numero>3</numero>
<fpage>271</fpage>
<lpage>275</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0035-001X2003000300013&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0035-001X2003000300013&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0035-001X2003000300013&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Making use of the classical Binet's equation a general procedure to obtain the gravitational force corresponding to an arbitrary 4-dimensional spacetime is presented. This method provides, for general relativistic scenarios, classics expressions that may help to visualize certain effects that Newton's theory can not explain. In particular, the force produced by a gravitational field which source is spherically symmetrical (Schwarzschild's spacetime) is obtained. Such expression uses a redefinition of the classical reduced mass, in the limit case it can be reduced to Newton's universal law of gravitation and it produces two different orbital velocities for test particles that asimptotically coincide with the Newtonian one. As far as we know this is a new result.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Se presenta, haciendo uso de la ecuación de Binet clásica, un procedimiento general para obtener la expresión de la fuerza gravitacional correspondiente a un espacio-tiempo tetradimensional arbitrario. Este método provee expresiones clásicas para escenarios relativistas, lo que podría ayudar a visualizar efectos que no pueden ser explicados por la teoría newtoniana. En particular, se obtiene la fuerza producida por un campo gravitacional, cuya fuente es esféricamente simétrica (espacio-tiempo de Schwarzschild). Tal expresión emplea una redefinición de la masa reducida clásica, en el caso límite se reduce a la ley de gravitación universal de Newton y produce dos velocidades orbitales diferentes para partículas de prueba insertas en el campo, que coinciden asintóticamente con la velocidad orbital newtoniana. Hasta donde conocen los autores, éste es un resultado nuevo.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Universal gravitational law]]></kwd>
<kwd lng="en"><![CDATA[perihelionshift]]></kwd>
<kwd lng="en"><![CDATA[Schwarzschild potential]]></kwd>
<kwd lng="en"><![CDATA[reduced mass]]></kwd>
<kwd lng="es"><![CDATA[Ley de gravitación universal]]></kwd>
<kwd lng="es"><![CDATA[corrimiento del perihelio]]></kwd>
<kwd lng="es"><![CDATA[potencial de Schwarzschild]]></kwd>
<kwd lng="es"><![CDATA[masa reducida]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[ <p align="justify"><font face="verdana" size="4">Ense&ntilde;anza</font></p>      <p align="justify">&nbsp;</p>     <p align="center"><font face="verdana" size="4"><b>Obtaining the gravitational force corresponding to arbitrary spacetimes. The Schwarzschild's case</b></font></p>     <p align="center">&nbsp;</p>      <p align="center"><font face="verdana" size="2"><b>T. Soldovieri* and A.G. Mu&ntilde;oz S.**</b></font></p>     <p align="center">&nbsp;</p>      <p align="justify"><font face="verdana" size="2"><i>G.I.F.T.</i> <i>Depto.</i> <i>de</i> <i>F&iacute;sica.</i> <i>Facultad de</i> <i>Ciencias,</i> <i>La</i> <i>Universidad</i> <i>del Zulia</i> <i>(LUZ),</i> <i>Maracaibo</i> <i>4001</i> <i>&#45;</i> <i>Venezuela,</i> <i>*</i>e&#45;mail: <a href="mailto:tsoldovi@luz.ve">tsoldovi@luz.ve</a>, **<a href="mailto:agmunoz@luz.ve">agmunoz@luz.ve</a></font></p>      <p align="justify">&nbsp;</p>     <p align="justify"><font face="verdana" size="2">Recibido el 19 de junio de 2002.     <br>   Aceptado el 6 de diciembre de 2002.</font></p>      ]]></body>
<body><![CDATA[<p align="justify">&nbsp;</p>     <p align="justify"><font face="verdana" size="2"><b>Abstarct</b></font></p>      <p align="justify"><font face="verdana" size="2">Making use of the classical Binet's equation a general procedure to obtain the gravitational force corresponding to an arbitrary 4&#45;dimensional spacetime is presented. This method provides, for general relativistic scenarios, classics expressions that may help to visualize certain effects that Newton's theory can not explain. In particular, the force produced by a gravitational field which source is spherically symmetrical (Schwarzschild's spacetime) is obtained. Such expression uses a redefinition of the classical reduced mass, in the limit case it can be reduced to Newton's universal law of gravitation and it produces <i>two</i> different orbital velocities for test particles that asimptotically coincide with the Newtonian one. As far as we know this is a new result.</font></p>      <p align="justify"><font face="verdana" size="2"><b>Keywords:</b> Universal gravitational law; perihelionshift; Schwarzschild potential; reduced mass.</font></p>      <p align="justify">&nbsp;</p>     <p align="justify"><font face="verdana" size="2"><b>Resumen</b></font></p>      <p align="justify"><font face="verdana" size="2">Se presenta, haciendo uso de la ecuaci&oacute;n de Binet cl&aacute;sica, un procedimiento general para obtener la expresi&oacute;n de la fuerza gravitacional correspondiente a un espacio&#45;tiempo tetradimensional arbitrario. Este m&eacute;todo provee expresiones cl&aacute;sicas para escenarios relativistas, lo que podr&iacute;a ayudar a visualizar efectos que no pueden ser explicados por la teor&iacute;a newtoniana. En particular, se obtiene la fuerza producida por un campo gravitacional, cuya fuente es esf&eacute;ricamente sim&eacute;trica (espacio&#45;tiempo de Schwarzschild). Tal expresi&oacute;n emplea una redefinici&oacute;n de la masa reducida cl&aacute;sica, en el caso l&iacute;mite se reduce a la ley de gravitaci&oacute;n universal de Newton y produce <i>dos</i> velocidades orbitales diferentes para part&iacute;culas de prueba insertas en el campo, que coinciden asint&oacute;ticamente con la velocidad orbital newtoniana. Hasta donde conocen los autores, &eacute;ste es un resultado nuevo.</font></p>      <p align="justify"><font face="verdana" size="2"><b>Palabras clave:</b> Ley de gravitaci&oacute;n universal; corrimiento del perihelio; potencial de Schwarzschild; masa reducida.</font></p>      <p align="justify"><font face="verdana" size="2">PACS: 04.25.Nx; 95.10.Ce; 95.30.Sf</font></p>     <p align="justify">&nbsp;</p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2"><a href="/pdf/rmf/v49n3/v49n3a13.pdf" target="_blank">DESCARGAR ART&Iacute;CULO EN FORMATO PDF</a></font></p>     <p align="justify">&nbsp;</p>       <p align="justify"><font face="verdana" size="2"><b>References</b></font></p>      <!-- ref --><p align="justify"><font face="verdana" size="2">1. I. Newton, <i>Philosophie Naturalis Principia Mathematica</i> (Editorial Tecnos, S.A., Madrid, 1987).    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=8294270&pid=S0035-001X200300030001300001&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>      <p align="justify"><font face="verdana" size="2">2. <i>Ibid.</i> p. 80.</font></p>      <!-- ref --><p align="justify"><font face="verdana" size="2">3. D. 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