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<article article-type="research-article" dtd-version="1.3" 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" xml:lang="ru"><front><journal-meta><journal-id journal-id-type="publisher-id">evestnik</journal-id><journal-title-group><journal-title xml:lang="ru">Российский социально-гуманитарный журнал</journal-title><trans-title-group xml:lang="en"><trans-title>Russian Social and Humanitarian Journal</trans-title></trans-title-group></journal-title-group><issn pub-type="epub">2224-0209</issn><publisher><publisher-name>State University of Education</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.18384/2224-0209-2014-1-935</article-id><article-id custom-type="elpub" pub-id-type="custom">evestnik-935</article-id><article-categories><subj-group subj-group-type="heading"><subject>Research Article</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="ru"><subject>ФИЗИКА И МАТЕМАТИКА</subject></subj-group></article-categories><title-group><article-title>О ВЫВОДЕ ОБОБЩЕННОЙ ГРАВИТАЦИОННОЙ ЭНТРОПИИ</article-title><trans-title-group xml:lang="en"><trans-title>NOTES ON DERIVATION OF GENERALIZED GRAVITATIONAL ENTROPY</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Фурсаев</surname><given-names>Д. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Fursaev</surname><given-names>D. ..</given-names></name></name-alternatives><email xlink:type="simple">noemail@neicon.ru</email></contrib></contrib-group><pub-date pub-type="collection"><year>2014</year></pub-date><pub-date pub-type="epub"><day>30</day><month>03</month><year>2014</year></pub-date><volume>0</volume><issue>1</issue><fpage>32</fpage><lpage>32</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Фурсаев Д.В., 2014</copyright-statement><copyright-year>2014</copyright-year><copyright-holder xml:lang="ru">Фурсаев Д.В.</copyright-holder><copyright-holder xml:lang="en">Fursaev D...</copyright-holder><license xml:lang="ru" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>Данная работа распространяется под лицензией Creative Commons Attribution 4.0.</license-p></license><license xml:lang="en" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>This work is licensed under a Creative Commons Attribution 4.0 License.</license-p></license></permissions><self-uri xlink:href="https://www.evestnik-mgou.ru/jour/article/view/935">https://www.evestnik-mgou.ru/jour/article/view/935</self-uri><abstract><p>Представлен новый вывод обобщенной гравитационной энтропии, связанной с поверхностями «перепутывания» коразмерности 2. Предлагаемый подход близок к «гамильтонову» методу Джакобсона-Майерса, в том смысле, что энтропия возникает из граничного слагаемого в гравитационном действии, когда выделяется малая область вблизи поверхности перепутывания. В наших аргументах мы используем идею Мальдасены-Левковича и интерпретируем граничное слагаемое а гравитационном действии как действие "космической струны" (браны). Однако важное отличие нашего подхода от первоначальной формулировки обобщенной гравитационной энтропии Мальдасены и Левковича в том, что мы не используем многообразия с коническими сингулярностями как инструмент проведения расчетов. Вариации гравитационных действий по параметру реплик подразумевают изменение положения "космической струны". Требуя, что поверхность перепутывания является экстремумом функционала энтропии, мы приходим к формуле, которая совпадает с известным результатом для энтропии черной дыры, когда поверхность перепутывания отождествляется с горизонтом. В применении нашего подхода к теориям гравитации в форме Лавлока формула для обобщенной энтропии совпадает с результатами, полученными другими методами.</p></abstract><trans-abstract xml:lang="en"><p>A novel derivation of generalized gravitational entropy associated to co-dimension 2 'entangling' hypersurfaces is given. The approach is similar to the Jacobson- Myers 'Hamiltonian' method in a sense that the entropy appears from a boundary term in the action when one isolates a small domain around the entangling surface. In our arguments we also use the idea by Lewkowycz and Maldacena and interpret the boundary term in the gravity action as a 'cosmic string' (brane) action. However, the important difference between our approach and the original formulation of the generalized gravitational entropy by Lewkowycz and Maldacena is that we never use manifolds with conical singularities as a tool to carry out the computations. Variations of gravity actions over the replica parameter imply changing position of the 'cosmic string'. By requiring that the entangling surface is an extremum of the entropy functional we come to the entropy formula which coincides with known results for black hole entropy formula when the entangling surface is a black hole horizon.When our approach is applied to Lovelock theories of gravity the generalized entropy formula coincides with results derived by other methods.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>энтропия квантового перепутывания</kwd><kwd>теории гравитации с высшими производными</kwd><kwd>квантовая гравитация</kwd></kwd-group><kwd-group xml:lang="en"><kwd>entropy of quantum entanglement</kwd><kwd>higher derivative gravity theories</kwd><kwd>quantum gravity</kwd></kwd-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">Bianchi E., Myers R.C. 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