<?xml version="1.0" encoding="UTF-8"?><?xml-stylesheet type="text/xsl" href="static/style.xsl"?><OAI-PMH xmlns="http://www.openarchives.org/OAI/2.0/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.openarchives.org/OAI/2.0/ http://www.openarchives.org/OAI/2.0/OAI-PMH.xsd"><responseDate>2026-04-20T09:29:13Z</responseDate><request verb="GetRecord" identifier="oai:repositorio.utb.edu.co:20.500.12585/9079" metadataPrefix="dim">https://repositorio.utb.edu.co/server/oai/request</request><GetRecord><record><header><identifier>oai:repositorio.utb.edu.co:20.500.12585/9079</identifier><datestamp>2025-04-09T03:37:01Z</datestamp><setSpec>com_20.500.12585_1</setSpec><setSpec>col_20.500.12585_8849</setSpec></header><metadata><dim:dim xmlns:dim="http://www.dspace.org/xmlns/dspace/dim" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:doc="http://www.lyncode.com/xoai" xsi:schemaLocation="http://www.dspace.org/xmlns/dspace/dim http://www.dspace.org/schema/dim.xsd">
   <dim:field mdschema="dc" element="creator">Gutiérrez-Piñeres A.C.</dim:field>
   <dim:field mdschema="dc" element="creator">López-Monsalvo, C.S.</dim:field>
   <dim:field mdschema="dc" element="date" qualifier="accessioned">2020-03-26T16:32:54Z</dim:field>
   <dim:field mdschema="dc" element="date" qualifier="available">2020-03-26T16:32:54Z</dim:field>
   <dim:field mdschema="dc" element="date" qualifier="issued">2013</dim:field>
   <dim:field mdschema="dc" element="identifier" qualifier="citation">Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics; Vol. 718, Núm. 4-5; pp. 1493-1499</dim:field>
   <dim:field mdschema="dc" element="identifier" qualifier="issn">03702693</dim:field>
   <dim:field mdschema="dc" element="identifier" qualifier="uri">https://hdl.handle.net/20.500.12585/9079</dim:field>
   <dim:field mdschema="dc" element="identifier" qualifier="doi">10.1016/j.physletb.2012.12.014</dim:field>
   <dim:field mdschema="dc" element="identifier" qualifier="instname">Universidad Tecnológica de Bolívar</dim:field>
   <dim:field mdschema="dc" element="identifier" qualifier="reponame">Repositorio UTB</dim:field>
   <dim:field mdschema="dc" element="identifier" qualifier="orcid">25225467000</dim:field>
   <dim:field mdschema="dc" element="identifier" qualifier="orcid">56013682900</dim:field>
   <dim:field mdschema="dc" element="description" qualifier="abstract" lang="eng">We present an exact, axially symmetric, static, vacuum solution for f(R)-gravity in Weyl's canonical coordinates. We obtain a general explicit expression for the dependence of df(R)/dR upon the r and z coordinates and then the corresponding explicit form of f(R), which must be consistent with the field equations. We analyze in detail the modified Schwarzschild solution in prolate spheroidal coordinates. Finally, we study the curvature invariants and show that, in the case of f(R)≠R, this solution corresponds to a naked singularity. © 2012 Elsevier B.V.</dim:field>
   <dim:field mdschema="dc" element="description" qualifier="sponsorship">Consejo Nacional de Ciencia y Tecnología: 290679_UNAM</dim:field>
   <dim:field mdschema="dc" element="format" qualifier="medium">Recurso electrónico</dim:field>
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   <dim:field mdschema="dc" element="language" qualifier="iso">eng</dim:field>
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   <dim:field mdschema="dc" element="rights" qualifier="cc">Atribución-NoComercial 4.0 Internacional</dim:field>
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   <dim:field mdschema="dc" element="title">A static axisymmetric exact solution of f(R)-gravity</dim:field>
   <dim:field mdschema="dc" element="type">Artículo</dim:field>
   <dim:field mdschema="dc" element="type" qualifier="driver">info:eu-repo/semantics/article</dim:field>
   <dim:field mdschema="dc" element="type" qualifier="hasversion">info:eu-repo/semantics/publishedVersion</dim:field>
   <dim:field mdschema="dc" element="subject" qualifier="keywords">Exact solution</dim:field>
   <dim:field mdschema="dc" element="subject" qualifier="keywords">F(R)-gravity</dim:field>
   <dim:field mdschema="dc" element="subject" qualifier="keywords">Static axisymmetric</dim:field>
   <dim:field mdschema="dcterms" element="bibliographicCitation">A.C.G.P. was partially supported by a TWAS-CONACYT Postdoctoral Fellowship Programme. C.S.L.M. acknowledges support from CONACYT grant 290679_UNAM .</dim:field>
   <dim:field mdschema="dcterms" element="bibliographicCitation">Sotiriou, T., Faraoni, V., (2010) Reviews of Modern Physics, 82 (1), p. 451</dim:field>
   <dim:field mdschema="dcterms" element="bibliographicCitation">Nojiri, S., Odintsov, S., (2011) Physics Reports, 505 (2), p. 59</dim:field>
   <dim:field mdschema="dcterms" element="bibliographicCitation">Multamäki, T., Vilja, I., (2006) Physical Review D, 74 (6), p. 064022</dim:field>
   <dim:field mdschema="dcterms" element="bibliographicCitation">Azadi, A., Momeni, D., Nouri-Zonoz, M., (2008) Physics Letters B, 670 (3), p. 210</dim:field>
   <dim:field mdschema="dcterms" element="bibliographicCitation">Capozziello, S., De Laurentis, M., Stabile, A., (2010) Classical and Quantum Gravity, 27 (16), p. 165008</dim:field>
   <dim:field mdschema="dcterms" element="bibliographicCitation">Cembranos, J., de la Cruz-Dombriz, A., Romero, P., Kerr-Newman black holes in f(r) theories, , arxiv:1109.4519</dim:field>
   <dim:field mdschema="dcterms" element="bibliographicCitation">Stephani, H., Kramer, D., MacCallum, M., Hoenselaers, C., Herlt, E., (2003) Exact Solutions of Einstein's Field Equations, , Cambridge University Press</dim:field>
   <dim:field mdschema="dcterms" element="bibliographicCitation">Carmeli, M., (1977) Group Theory and General Relativity: Representations of the Lorentz Group and Their Applications to the Gravitational Field, , Imperial College Press</dim:field>
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