<?xml version="1.0" encoding="UTF-8"?><!DOCTYPE article  PUBLIC "-//NLM//DTD Journal Publishing DTD v3.0 20080202//EN" "http://dtd.nlm.nih.gov/publishing/3.0/journalpublishing3.dtd"><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" dtd-version="3.0" xml:lang="en" article-type="research article"><front><journal-meta><journal-id journal-id-type="publisher-id">JHEPGC</journal-id><journal-title-group><journal-title>Journal of High Energy Physics, Gravitation and Cosmology</journal-title></journal-title-group><issn pub-type="epub">2380-4327</issn><publisher><publisher-name>Scientific Research Publishing</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.4236/jhepgc.2023.94068</article-id><article-id pub-id-type="publisher-id">JHEPGC-127101</article-id><article-categories><subj-group subj-group-type="heading"><subject>Articles</subject></subj-group><subj-group subj-group-type="Discipline-v2"><subject>Physics&amp;Mathematics</subject></subj-group></article-categories><title-group><article-title>
 
 
  Hidden Quantum Effect in General Relativity
 
</article-title></title-group><contrib-group><contrib contrib-type="author" xlink:type="simple"><name name-style="western"><surname>Miguel</surname><given-names>Socolovsky</given-names></name><xref ref-type="aff" rid="aff1"><sub>1</sub></xref><xref ref-type="corresp" rid="cor1"><sup>*</sup></xref></contrib></contrib-group><aff id="aff1"><label>1</label><addr-line>Instituto de Ciencias Nucleares, Universidad Nacional Autonoma de Mexico, Cd. Universitaria, Ciudad de M&amp;amp;eacute;xico, M&amp;amp;eacute;xico</addr-line></aff><pub-date pub-type="epub"><day>18</day><month>08</month><year>2023</year></pub-date><volume>09</volume><issue>04</issue><fpage>913</fpage><lpage>916</lpage><history><date date-type="received"><day>19,</day>	<month>May</month>	<year>2023</year></date><date date-type="rev-recd"><day>18,</day>	<month>August</month>	<year>2023</year>	</date><date date-type="accepted"><day>21,</day>	<month>August</month>	<year>2023</year></date></history><permissions><copyright-statement>&#169; Copyright  2014 by authors and Scientific Research Publishing Inc. </copyright-statement><copyright-year>2014</copyright-year><license><license-p>This work is licensed under the Creative Commons Attribution International License (CC BY). http://creativecommons.org/licenses/by/4.0/</license-p></license></permissions><abstract><p>
 
 
  If the Planck length is chosen as the natural length scale of the Universe, the Penrose-Carter diagram associated with the classical gravitational collapse of a thin spherical shell of massless matter reveals, beyond and in agreement with the claimed non locality of the horizon, a quantum nature of the whole process.
 
</p></abstract><kwd-group><kwd>Spherical Collapse</kwd><kwd> Penrose-Carter Diagram</kwd><kwd> Quantum Effect</kwd></kwd-group></article-meta></front><body><sec id="s1"><title>Acknowledgements</title><p>The author thanks the graduate students Daniel Kosoi La Mont, Jos&#233; D. L&#243;pez and Juan A. Cabrera at PCF-UNAM for enlightening discussions, and to Oscar Brauer at the University of Leeds, UK, for the drawing of <xref ref-type="fig" rid="fig1">Figure 1</xref>.</p></sec><sec id="s2"><title>Conflicts of Interest</title><p>The author declares no conflicts of interest regarding the publication of this paper.</p></sec><sec id="s3"><title>Cite this paper</title><p>Socolovsky, M. (2023) Hidden Quantum Effect in General Relativity. Journal of High Energy Physics, Gravitation and Cosmology, 9, 913-916. https://doi.org/10.4236/jhepgc.2023.94068</p></sec></body><back><ref-list><title>References</title><ref id="scirp.127101-ref1"><label>1</label><mixed-citation publication-type="other" xlink:type="simple">Penrose, R. (1963) Asymptotic Properties of Fields and Space-Times. Physical Review Letters, 10, 66-68. https://doi.org/10.1103/PhysRevLett.10.66</mixed-citation></ref><ref id="scirp.127101-ref2"><label>2</label><mixed-citation publication-type="other" xlink:type="simple">Carter, B. (1966) Complete Analytic Extension of the Symmetry Axis of Kerr’s Solution of Einstein’s Equation. Physical Review, 141, 1242-1247. https://doi.org/10.1103/PhysRev.141.1242</mixed-citation></ref><ref id="scirp.127101-ref3"><label>3</label><mixed-citation publication-type="other" xlink:type="simple">Susskind, L. and Lindesay, J. (2005) An Introduction to Black Holes, Information and the String Theory Revolution. The Holographic Universe. 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