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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">matmess</journal-id><journal-title-group><journal-title xml:lang="ru">Математические заметки СВФУ</journal-title><trans-title-group xml:lang="en"><trans-title>Mathematical notes of NEFU</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">2411-9326</issn><issn pub-type="epub">2587-876X</issn><publisher><publisher-name>Северо-Восточный федеральный университет имени М.К. Аммосова</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.25587/SVFU.2021.26.84.003</article-id><article-id custom-type="elpub" pub-id-type="custom">matmess-208</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>МАТЕМАТИКА</subject></subj-group></article-categories><title-group><article-title>УРАВНЕНИЕ ЭЙНШТЕЙНА НА ТРЕХМЕРНЫХ ЛОКАЛЬНО ОДНОРОДНЫХ (ПСЕВДО)РИМАНОВЫХ ПРОСТРАНСТВАХ С ВЕКТОРНЫМ КРУЧЕНИЕМ</article-title><trans-title-group xml:lang="en"><trans-title>EINSTEIN EQUATION ON THREE–DIMENSIONAL LOCALLY HOMOGENEOUS (PSEUDO)RIEMANNIAN MANIFOLDS WITH VECTORIAL TORSION</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>Клепиков</surname><given-names>П. Н.</given-names></name><name name-style="western" xml:lang="en"><surname>Klepikov</surname><given-names>P. N.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Клепиков Павел Николаевич</p><p>Алтайский государственный университет, кафедра математического анализа, пр. Ленина, 61, Барнаул 656049</p></bio><bio xml:lang="en"><p>Pavel N. Klepikov,</p><p>Altai State University, Department of Mathematical Analysis, 61 Lenin Street, Barnaul 656049, Russia</p></bio><email xlink:type="simple">klepikov.math@gmail.com</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Родионов</surname><given-names>Е. Д.</given-names></name><name name-style="western" xml:lang="en"><surname>Rodionov</surname><given-names>E. D.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Родионов Евгений Дмитриевич,</p><p>Алтайский государственный университет, кафедра математического анализа, пр. Ленина, 61, Барнаул 656049</p></bio><bio xml:lang="en"><p>Evgenii D. Rodionov,</p><p>Altai State University, Department of Mathematical Analysis, 61 Lenin Street, Barnaul 656049, Russia</p></bio><email xlink:type="simple">edr2002@mail.ru</email><xref ref-type="aff" rid="aff-2"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Хромова</surname><given-names>О. П.</given-names></name><name name-style="western" xml:lang="en"><surname>Khromova</surname><given-names>O. P.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Хромова Олеся Павловна</p><p>Алтайский государственный университет, кафедра математического анализа, пр. Ленина, 61, Барнаул 656049</p></bio><bio xml:lang="en"><p>Altai State University,</p><p>Department of Mathematical Analysis, 61 Lenin Street, Barnaul 656049, Russia</p></bio><email xlink:type="simple">khromova.olesya@gmail.com</email><xref ref-type="aff" rid="aff-2"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Алтайский государственный университет, кафедра математического анализа</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Altai State University,&#13;
Department of Mathematical Analysis</institution><country>Russian Federation</country></aff></aff-alternatives><aff-alternatives id="aff-2"><aff xml:lang="ru"><institution>Алтайский государственный университет, кафедра математического анализа</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Altai State University, Department of Mathematical Analysis</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2021</year></pub-date><pub-date pub-type="epub"><day>02</day><month>04</month><year>2026</year></pub-date><volume>28</volume><issue>4</issue><fpage>30</fpage><lpage>47</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Клепиков П.Н., Родионов Е.Д., Хромова О.П., 2026</copyright-statement><copyright-year>2026</copyright-year><copyright-holder xml:lang="ru">Клепиков П.Н., Родионов Е.Д., Хромова О.П.</copyright-holder><copyright-holder xml:lang="en">Klepikov P.N., Rodionov E.D., Khromova O.P.</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://matmess.elpub.ru/jour/article/view/208">https://matmess.elpub.ru/jour/article/view/208</self-uri><abstract><p>Впервые метрическая связность с векторным кручением, или полусимметрическая метрическая связность, была открыта Э. Картаном. Позднее свойства данной связности изучали многие математики. Так, например, К. Яно, И. Агрикола и другие математики исследовали свойства тензора кривизны, геодезические линии, а также поведение связности при конформных деформациях исходной метрики.</p><p>В данной работе исследуется уравнение Эйнштейна на трехмерных локально однородных (псевдо)римановых многообразиях с метрической связностью с инвариантным векторным кручением. Доказана теорема о том, что все такие многообразия либо являются многообразиями Эйнштейна относительно связности ЛевиЧивита, либо конформно плоские. Ранее авторами исследовалось уравнение Эйнштейна в случае трехмерных локально симметрических (псевдо)римановых многообразий.</p></abstract><trans-abstract xml:lang="en"><p>A metric connection with vectorial torsion, or a semi-symmetric metric connection, was discovered by E. Cartan. Later, many mathematicians studied the properties of this connection. For example, K. Yano, I. Agricola and other mathematicians investigated the properties of the curvature tensor, geodesic lines, and also the behavior of the connection under conformal deformations of the original metric.</p><p>In this paper, we study the Einstein equation on three-dimensional locally homogeneous (pseudo)Riemannian manifolds with metric connection with invariant vectorial torsion. A theorem is obtained stating that all such manifolds are either Einstein manifolds with respect to the Levi-Civita connection or conformally flat. Earlier, the Einstein equation in the case of three-dimensional locally symmetric (pseudo)Riemannian manifolds have been investigated by the authors. </p></trans-abstract><kwd-group xml:lang="ru"><kwd>алгебры Ли</kwd><kwd>векторное кручение</kwd><kwd>инвариантные (псевдо)римановы метрики</kwd><kwd>локально однородные пространства</kwd><kwd>многообразия Эйнштейна.</kwd></kwd-group><kwd-group xml:lang="en"><kwd>Einstein manifold</kwd><kwd>invariant (pseudo)Riemannian metric</kwd><kwd>Lie algebra</kwd><kwd>locally homogeneous space</kwd><kwd>vectorial torsion.</kwd></kwd-group><funding-group><funding-statement xml:lang="ru">Работа выполнена при поддержке РНФ (грант № 22–21–00111 «Псевдоримановы многообразия с ограничениями на тензор Риччи»).</funding-statement></funding-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">Cartan E. 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