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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">vestifm</journal-id><journal-title-group><journal-title xml:lang="ru">Известия Национальной академии наук Беларуси. Серия физико-математических наук</journal-title><trans-title-group xml:lang="en"><trans-title>Proceedings of the National Academy of Sciences of Belarus. Physics and Mathematics Series</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">1561-2430</issn><issn pub-type="epub">2524-2415</issn><publisher><publisher-name>The Republican Unitary Enterprise Publishing House "Belaruskaya Navuka"</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.29235/1561-2430-2023-59-4-308-314</article-id><article-id custom-type="elpub" pub-id-type="custom">vestifm-745</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</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>PHYSICS</subject></subj-group></article-categories><title-group><article-title>Сферически-симметричные нестатические решения уравнений Эйнштейна</article-title><trans-title-group xml:lang="en"><trans-title>Spherically-symmetric non-static solutions of Einstein’s equations</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>Выблый</surname><given-names>Ю. П.</given-names></name><name name-style="western" xml:lang="en"><surname>Vyblyi</surname><given-names>Yu. P.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Выблый Юрий Петрович – кандидат физико-математических наук, ведущий научный сотрудник</p><p>пр. Независимости, 68-2, 220072, Минск</p></bio><bio xml:lang="en"><p>Yuri P. Vyblyi – Ph. D. (Physics and Mathematics), Leading Researher</p><p>68-2, Nezavisimosti Ave., 220072, Minsk, Republic of Belarus</p></bio><email xlink:type="simple">vyblyi@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>Леонович</surname><given-names>А. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Leonovich</surname><given-names>A. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Леонович Анатолий Александрович – кандидат физико-математических наук, доцент</p><p>ул. П. Бровки, 6, 220013, Минск</p><p> </p></bio><bio xml:lang="en"><p>Anatoli A. Leonovich – Ph. D. (Physics and Mathematics), Associate Professor</p><p>6, P. Brovka Str., 220013, Minsk, Republic of Belarus)</p></bio><email xlink:type="simple">kaffiz@bsuir.by</email><xref ref-type="aff" rid="aff-2"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Институт физики имени Б. И. Степанова Национальной академии наук Беларуси</institution></aff><aff xml:lang="en"><institution>B. I. Stepanov Institute of Physics of the National Academy of Sciences of Belarus</institution></aff></aff-alternatives><aff-alternatives id="aff-2"><aff xml:lang="ru"><institution>Белорусский государственный университет информатики и радиоэлектроники</institution></aff><aff xml:lang="en"><institution>Belarussian State University of Informatics and Radioelectronics</institution></aff></aff-alternatives><pub-date pub-type="collection"><year>2023</year></pub-date><pub-date pub-type="epub"><day>05</day><month>01</month><year>2024</year></pub-date><volume>59</volume><issue>4</issue><fpage>308</fpage><lpage>314</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Выблый Ю.П., Леонович А.А., 2024</copyright-statement><copyright-year>2024</copyright-year><copyright-holder xml:lang="ru">Выблый Ю.П., Леонович А.А.</copyright-holder><copyright-holder xml:lang="en">Vyblyi Y.P., Leonovich A.A.</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://vestifm.belnauka.by/jour/article/view/745">https://vestifm.belnauka.by/jour/article/view/745</self-uri><abstract><p>Рассмотрены нестатические вакуумные сферически-симметричные решения системы уравнений Эйнштейна и условий гармоничности в системе координат с отличной от нуля пространственно-временной компонентой метрики. Для случая слабого поля получено частное решение приближенных уравнений, которое соответствует нестатическому источнику, граница которого движется с постоянной скоростью. Для точных уравнений Эйнштейна получено решение волнового типа, определяемое двумя заданными неявно функциями, зависящими, соответственно, от запаздывающего аргумента и радиальной координаты. Обсуждается связь этих решений с теоремой Биркгофа.</p></abstract><trans-abstract xml:lang="en"><p>In this paper, we considered non-static vacuum spherically symmetric solutions of the Einstein equations and harmonicity conditions in the coordinate system with a non-zero space-time component in the metric. For the case of the weak field, a particular solution of the approximate equations was obtained, which corresponds to a nonstatic source whose boundary moves with a constant speed. For the exact Einstein’s equations we obtained a wave-type solution, determined by two implicitly specified functions, depending on the retarded argument and on the radial coordinate, respectively. The connection between these solutions and the Birkhoff theorem is discussed.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>теория гравитации</kwd><kwd>уравнения Эйнштейна</kwd><kwd>теорема Биркгофа</kwd><kwd>сферическая симметрия</kwd><kwd>нестатические решения</kwd><kwd>гравитационная волна</kwd></kwd-group><kwd-group xml:lang="en"><kwd>theory of gravity</kwd><kwd>Einstein’s equations</kwd><kwd>Birkhoff theorem</kwd><kwd>spherical symmetry</kwd><kwd>nonstatic solutions</kwd><kwd>gravitational wave</kwd></kwd-group><funding-group><funding-statement xml:lang="ru">Работа выполнена при поддержке Белорусского республиканского фонда фундаментальных исследований (грант № Ф22МЦ-005).</funding-statement><funding-statement xml:lang="en">The work was carried out with the support of the Belarusian Republican Foundation for Basic Research (grant no. 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