<?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>2617-4731</journal-id>
<journal-title><![CDATA[Revista de la Sociedad Científica del Paraguay]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. Soc. cient. Parag.]]></abbrev-journal-title>
<issn>2617-4731</issn>
<publisher>
<publisher-name><![CDATA[Sociedad Científica del Paraguay]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S2617-47312018000200199</article-id>
<article-id pub-id-type="doi">10.32480/rscp.2018-23-2.199-226</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Acerca del enlentecimiento de los relojes acelerados II: tiempo propio relativista y unus mundus físico]]></article-title>
<article-title xml:lang="en"><![CDATA[About the slowing down of accelerated clocks II: relativistic proper time and physical unus mundus]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Suárez-Antola]]></surname>
<given-names><![CDATA[Roberto]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Ministerio de Industria, Energía y Minería  ]]></institution>
<addr-line><![CDATA[Montevideo ]]></addr-line>
<country>Uruguay</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2018</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2018</year>
</pub-date>
<volume>23</volume>
<numero>2</numero>
<fpage>199</fpage>
<lpage>226</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://scielo.iics.una.py/scielo.php?script=sci_arttext&amp;pid=S2617-47312018000200199&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.iics.una.py/scielo.php?script=sci_abstract&amp;pid=S2617-47312018000200199&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.iics.una.py/scielo.php?script=sci_pdf&amp;pid=S2617-47312018000200199&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen La convergencia de la integral que da el tiempo propio en función del tiempo inercial, cuando la velocidad tiende a la velocidad de la luz lo suficientemente rápido mientras el tiempo inercial tiende al infinito, fue estudiada en 1985. Aquí se reconsidera este problema en el marco de la teoría restringida de la relatividad. Nada especial (además de la tasa de crecimiento hacia el infinito) parece caracterizar el comportamiento de la componente tangencial de los campos de 3- fuerza a lo largo de la trayectoria del reloj acelerado, en relación con la convergencia o divergencia de la integral que da el tiempo propio como función del tiempo inercial. Sin embargo, visto desde el punto de vista de la aceleración propia del reloj, aparece una diferencia físicamente significativa entre los dos casos lógicamente posibles. Uno está integrado por las historias de 3-aceleración propia tangenciales que dan un tiempo propio finito para un tiempo inercial infinito. El otro está integrado por las historias de 3-aceleraciones propias tangenciales que dan un tiempo propio infinito para un tiempo inercial infinito. En el primer caso aparece una singularidad en la 3-aceleracion propia para un valor finito de tiempo propio. En el segundo caso esa singularidad no aparece. Los resultados obtenidos se comparan, en el marco de la teoría de la relatividad general, con el la rela- ción entre el tiempo propio y el tiempo inercial durante la caída de una partícula hacia un agujero negro. Se enfatizan las consecuencias de estos resultados sobre la validez de un postulado que se encuentra en la base de la formulación original de la teoría de la relatividad, según el cual todos los observadores en el universo, con independencia de su estado de movimiento, deben estar de acuerdo sobre la ocurrencia de ciertos sucesos, tales como explosiones e implosiones, nacimientos y muer- tes.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract The convergence of the integral that gives the proper time as a function of inertial time, when speed tends to the speed of light fast enough as inertial time tends to infinity, was studied in 1985. This problem is reconsidered here, in the framework of special relativity. Nothing special (besides the rate of growth towards infinity) seems to characterize the behavior of the tangent com- ponent of the fields of 3-force along the path of the accelerated clock, in relation with the conver- gence or divergence of the integral that gives proper time as function of inertial time. However, seen from the viewpoint of the proper acceleration of the clock, a physically meaningful difference appears between the tangential proper 3-acceleration histories that give a finite proper time for an infinite inertial time, and those tangential proper 3-acceleration histories that give an infinite proper time for an infinite inertial time: either a singularity in proper 3-acceleration for a finite value of proper time in one case, or its absence in the other case. The obtained results are compared, in the framework of general relativity theory, with the behavior of proper time relative to inertial time during the fall of a particle towards a black hole. The consequences of these results on the validity of a postulate that is at the base of the original formulation of the theory of relativity are empha- sized, according to which all observers in the universe, regardless of their state of movement, should be agree on the occurrence of certain events, such as explosions and implosions, births and deaths.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[teoría restringida de la relatividad]]></kwd>
<kwd lng="es"><![CDATA[teoría generalizada de la relatividad]]></kwd>
<kwd lng="es"><![CDATA[tiempo propio]]></kwd>
<kwd lng="es"><![CDATA[tiempo inercial]]></kwd>
<kwd lng="es"><![CDATA[unus mundus]]></kwd>
<kwd lng="es"><![CDATA[agujero negro.]]></kwd>
<kwd lng="en"><![CDATA[restricted relativity theory]]></kwd>
<kwd lng="en"><![CDATA[generalized relativity theory]]></kwd>
<kwd lng="en"><![CDATA[proper time]]></kwd>
<kwd lng="en"><![CDATA[inertial time]]></kwd>
<kwd lng="en"><![CDATA[unus mundus]]></kwd>
<kwd lng="en"><![CDATA[blackhole]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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