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<article 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" xmlns:ali="http://www.niso.org/schemas/ali/1.0/" article-type="research-article" dtd-version="1.2" xml:lang="en"><front><journal-meta><journal-id journal-id-type="publisher-id">Доклады Академии наук</journal-id><journal-title-group><journal-title xml:lang="en">Доклады Академии наук</journal-title><trans-title-group xml:lang="ru"><trans-title>Доклады Академии наук</trans-title></trans-title-group></journal-title-group><issn publication-format="print">0869-5652</issn><publisher><publisher-name xml:lang="en">The Russian Academy of Sciences</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="publisher-id">15823</article-id><article-id pub-id-type="doi">10.31857/S0869-56524874376-380</article-id><article-categories><subj-group subj-group-type="toc-heading" xml:lang="en"><subject>Mechanics</subject></subj-group><subj-group subj-group-type="toc-heading" xml:lang="ru"><subject>Механика</subject></subj-group><subj-group subj-group-type="article-type"><subject>Research Article</subject></subj-group></article-categories><title-group><article-title xml:lang="en">On bifurcation of the four Liouville tori in one generalized integrable model of the vortex dynamics</article-title><trans-title-group xml:lang="ru"><trans-title>О бифуркации четырёх торов Лиувилля в одной обобщённой интегрируемой модели вихревой динамики</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Ryabov</surname><given-names>P. E.</given-names></name><name xml:lang="ru"><surname>Рябов</surname><given-names>П. Е.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>peryabov@fa.ru</email><xref ref-type="aff" rid="aff1"/><xref ref-type="aff" rid="aff2"/><xref ref-type="aff" rid="aff3"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Finance University under the Government of the Russian Federation</institution></aff><aff><institution xml:lang="ru">Финансовый университет при Правительстве Российской Федерации</institution></aff></aff-alternatives><aff-alternatives id="aff2"><aff><institution xml:lang="en">Institute of Machines Sciense named after A.A. Blagonravov of the Russian Academy of Sciences</institution></aff><aff><institution xml:lang="ru">Институт машиноведения имени А.А. Благонравова Российской академии наук</institution></aff></aff-alternatives><aff-alternatives id="aff3"><aff><institution xml:lang="en">Udmurt State University</institution></aff><aff><institution xml:lang="ru">Удмуртский государственный университет</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2019-08-27" publication-format="electronic"><day>27</day><month>08</month><year>2019</year></pub-date><volume>487</volume><issue>4</issue><issue-title xml:lang="en"/><issue-title xml:lang="ru"/><fpage>376</fpage><lpage>380</lpage><history><date date-type="received" iso-8601-date="2019-08-23"><day>23</day><month>08</month><year>2019</year></date><date date-type="accepted" iso-8601-date="2019-08-23"><day>23</day><month>08</month><year>2019</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2019, Russian academy of sciences</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2019, Российская академия наук</copyright-statement><copyright-year>2019</copyright-year><copyright-holder xml:lang="en">Russian academy of sciences</copyright-holder><copyright-holder xml:lang="ru">Российская академия наук</copyright-holder></permissions><self-uri xlink:href="https://journals.eco-vector.com/0869-5652/article/view/15823">https://journals.eco-vector.com/0869-5652/article/view/15823</self-uri><abstract xml:lang="en"><p>The article deals with a generalized mathematical model of the dynamics of two point vortices in the Bose-Einstein condensate enclosed in a harmonic trap, and of the dynamics of two point vortices in an ideal fluid bounded by a circular region. In the case of a positive vortex pair, which is of interest for physical experimental applications, a new bifurcation diagram is obtained, for which the bifurcation of four tori into one is indicated. The presence of bifurcations of three and four tori in the integrable model of vortex dynamics with positive intensities indicates a complex transition and the connection of bifurcation diagrams of both limit cases. Analytical results of this publication (the bifurcation diagram, the reduction to a system with one degree of freedom, the stability analysis) form the basis of computer simulation of absolute dynamics of vortices in a fixed coordinate system in the case of arbitrary values of the physical parameters of the model (the intensities, the vortex interaction and etc.).</p></abstract><trans-abstract xml:lang="ru"><p>Рассматривается обобщённая математическая модель динамики двух точечных вихрей в бозе-эйнштейновском конденсате, заключённом в гармоническую ловушку, и динамики двух точечных вихрей в идеальной жидкости, ограниченной круговой областью. В случае положительной вихревой пары, представляющей интерес для физических экспериментальных приложений, получена новая бифуркационная диаграмма, для которой показано наличие бифуркации четырёх торов в один. Бифуркации трёх и четырёх торов в интегрируемой обобщённой модели вихревой динамики с положительными интенсивностями свидетельствуют о сложном переходе и связи бифуркационных диаграмм обоих предельных случаев. Аналитические результаты данной публикации (бифуркационная диаграмма, сведение к системе с одной степенью свободы, анализ устойчивости) составляют основу компьютерного моделирования абсолютной динамики вихрей в фиксированной системе координат при произвольных значениях физических параметров модели (интенсивностей, параметра вихревого взаимодействия и др.).</p></trans-abstract><kwd-group xml:lang="en"><kwd>completely integrable hamiltonian systems</kwd><kwd>bifurcation diagram of momentum mapping</kwd><kwd>bifurcations of Liouville tori</kwd><kwd>dynamics of vortices</kwd><kwd>Bose-Einstein condensate</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>вполне интегрируемые гамильтоновы системы</kwd><kwd>бифуркационная диаграмма отображения момента</kwd><kwd>бифуркации торов Лиувилля</kwd><kwd>динамика вихрей</kwd><kwd>бозе-эйнштейновский конденсат</kwd></kwd-group><funding-group><award-group><funding-source><institution-wrap><institution xml:lang="en">Ministry of Education and Science of the Russian Federation</institution></institution-wrap><institution-wrap><institution xml:lang="ru">Министерство образования и науки Российской Федерации</institution></institution-wrap></funding-source><award-id></award-id></award-group><award-group><funding-source><institution-wrap><institution xml:lang="en">Russian Foundation for Basic Research</institution></institution-wrap><institution-wrap><institution xml:lang="ru">Российский фонд фундаментальных исследований</institution></institution-wrap></funding-source><award-id></award-id></award-group></funding-group></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Torres P.J., Kevrekidis P.G., Frantzeskakis D.J., Carretero-Gonzalez R., Schmelcher P., Hall D.S. 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