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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">Discrete and Continuous Models and Applied Computational Science</journal-id><journal-title-group><journal-title xml:lang="en">Discrete and Continuous Models and Applied Computational Science</journal-title><trans-title-group xml:lang="ru"><trans-title>Discrete and Continuous Models and Applied Computational Science</trans-title></trans-title-group></journal-title-group><issn publication-format="print">2658-4670</issn><issn publication-format="electronic">2658-7149</issn><publisher><publisher-name xml:lang="en">Peoples' Friendship University of Russia named after Patrice Lumumba (RUDN University)</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="publisher-id">8540</article-id><article-categories><subj-group subj-group-type="toc-heading" xml:lang="en"><subject>Articles</subject></subj-group><subj-group subj-group-type="toc-heading" xml:lang="ru"><subject>Статьи</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">Tachyon Gas as a Candidate for Dark Matter</article-title><trans-title-group xml:lang="ru"><trans-title>Тахионный газ как кандидат на тёмную материю</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Rylov</surname><given-names>Y A</given-names></name><name xml:lang="ru"><surname>Рылов</surname><given-names>Юрий Аркадьевич</given-names></name></name-alternatives><email>-</email><xref ref-type="aff" rid="aff1"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Institute for Problems in Mechanics, Russian Academy of Sciences</institution></aff><aff><institution xml:lang="ru">Институт проблем механики, РАН</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2013-02-15" publication-format="electronic"><day>15</day><month>02</month><year>2013</year></pub-date><issue>2</issue><issue-title xml:lang="en">NO2 (2013)</issue-title><issue-title xml:lang="ru">№2 (2013)</issue-title><fpage>159</fpage><lpage>173</lpage><history><date date-type="received" iso-8601-date="2016-09-08"><day>08</day><month>09</month><year>2016</year></date></history><permissions><copyright-statement xml:lang="ru">Copyright ©; 2013, Рылов Ю.А.</copyright-statement><copyright-year>2013</copyright-year><copyright-holder xml:lang="ru">Рылов Ю.А.</copyright-holder><ali:free_to_read xmlns:ali="http://www.niso.org/schemas/ali/1.0/"/><license><ali:license_ref xmlns:ali="http://www.niso.org/schemas/ali/1.0/">http://creativecommons.org/licenses/by/4.0</ali:license_ref></license></permissions><self-uri xlink:href="https://journals.rudn.ru/miph/article/view/8540">https://journals.rudn.ru/miph/article/view/8540</self-uri><abstract xml:lang="en">In the physical geometry (i.e. in geometry, described completely by its world function) identical geometric objects have identical description in terms of the world function. As a result spacelike straight segment is a three-dimensional surface even in the space-time geometry of Minkowski. Tachyons have two unexpected properties: (1) a single tachyon cannot be detected and (2) the tachyon gas can be detected by its gravitational inﬂuence. Although molecules (tachyons) of the tachyon gas moves with superluninal velocities, the mean motion of these molecules appears to be underluminal. The tachyon gas properties diﬀers from those of usual gas. The pressure of the tachyon gas depends on the gravitational potential and does not depend on temperature. As a result the tachyon gas may form huge halos around galaxies. These halos have almost constant density, and this circumstance can explain the law of star velocities at the periphery of a galaxy. Properties of the tachyon gas admit one to consider it as a dark matter.</abstract><trans-abstract xml:lang="ru">В физической геометрии (т. е. геометрии полностью описываемой её мировой функцией) тождественные объекты имеют одинаковое описание в терминах мировой функции. В результате пространственно-подобный отрезок прямой представляет собой трёхмерную поверхность даже в пространственно-временной геометрии Минковского. В дискретной геометрии пространства–времени тахионы имеют два неожиданных свойства: 1 — отдельный тахион не может быть обнаружен; 2 — тахионный газ может быть обнаружен по его гравитационному воздействию. Хотя молекулы (тахионы) тахионного газа движутся со сверхсветовыми скоростями, средняя скорость движения этих молекул оказывается досветовой. Свойства тахионного газа отличаются от свойств обычного газа. Давление тахионного газа зависит от гравитационного потенциала и не зависит от температуры. В результате тахионный газ может образовывать огромные гало вокруг галактик. Эти гало имеют почти постоянную плотность, и это обстоятельство может объяснить кривые вращения звёзд на периферии Галактики. Свойства тахионного газа позволяют рассматривать его как тёмную материю.</trans-abstract><kwd-group xml:lang="en"><kwd>discrete geometry</kwd><kwd>tachyon</kwd><kwd>dark matter</kwd><kwd>dark energy</kwd><kwd>rotation curves</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>дискретная геометрия</kwd><kwd>тахион</kwd><kwd>тёмная материя</kwd><kwd>тёмная энергия</kwd><kwd>кривые вращения</kwd></kwd-group></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Blumenthal L.M. Theory and Applications of Distance Geometry. — Oxford: Clarendon Press, 1953.</mixed-citation></ref><ref id="B2"><label>2.</label><mixed-citation>Sommerfeld A. Simplified Deduction of the Field and the Forces of an Electron Moving in Any GivenWay // Knkl. 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