{"id":87,"date":"2021-09-14T11:52:50","date_gmt":"2021-09-14T09:52:50","guid":{"rendered":"https:\/\/victorbrunet.fr\/?p=87"},"modified":"2021-09-14T11:52:50","modified_gmt":"2021-09-14T09:52:50","slug":"des-chercheurs-ont-genere-un-univers-virtuel-complet-et-cest-telechargeable","status":"publish","type":"post","link":"https:\/\/victorbrunet.fr\/index.php\/2021\/09\/14\/des-chercheurs-ont-genere-un-univers-virtuel-complet-et-cest-telechargeable\/","title":{"rendered":"Des chercheurs ont g\u00e9n\u00e9r\u00e9 un univers virtuel complet, et c\u2019est t\u00e9l\u00e9chargeable\u2026"},"content":{"rendered":"<p><strong>Cette derni\u00e8re d\u00e9cennie marque un tournant majeur pour l\u2019\u00e9tude et la compr\u00e9hension de l\u2019Univers et de son \u00e9volution, notamment gr\u00e2ce \u00e0 de nouveaux environnements virtuels de simulation permettant aux scientifiques de g\u00e9n\u00e9rer des univers virtuels avec un niveau de d\u00e9tails impressionnant, afin d\u2019en \u00e9tudier certains m\u00e9canismes. R\u00e9cemment, des chercheurs ont produit la simulation la plus vaste et la plus d\u00e9taill\u00e9e \u00e0 ce jour.<\/strong><\/p>\n<div id=\"pa-container-0\" class=\"pa-global-class pa-pl-13956 pa-pl-multiInsert\">\n<div id=\"pa-unit-0\" class=\"pa-unit-global pa-pl-13956\">\n<div class=\"pa-observer-px\"><\/div>\n<p><iframe class=\"current-frame\" src=\"about:blank\" frameborder=\"0\" marginwidth=\"0\" marginheight=\"0\" scrolling=\"no\" data-mce-fragment=\"1\"><\/iframe><\/p>\n<\/div>\n<\/div>\n<p>En modifiant diff\u00e9rents param\u00e8tres de ces simulations, les astronomes peuvent voir comment des \u00e9l\u00e9ments tels que la mati\u00e8re noire et l\u2019\u00e9nergie noire jouent un r\u00f4le dans notre univers. R\u00e9cemment, des chercheurs du projet de simulation Uchuu ont publi\u00e9 les donn\u00e9es de leur derni\u00e8re simulation, la plus d\u00e9taill\u00e9e \u00e0 ce jour, permettant \u00e0 quiconque disposant des moyens techniques et des connaissances d\u2019impl\u00e9mentation n\u00e9cessaires de reproduire leur univers virtuel.<\/p>\n<h2>La simulation d\u2019univers la plus vaste et la plus d\u00e9taill\u00e9e \u00e0 ce jour<\/h2>\n<p>La derni\u00e8re simulation Uchuu, d\u00e9crite dans un article publi\u00e9 r\u00e9cemment sur le serveur de pr\u00e9impression\u00a0<em>arXiv<\/em>, est la plus grande et la plus d\u00e9taill\u00e9e des simulations d\u2019univers jamais r\u00e9alis\u00e9es. Elle contient 2,1 billions de \u00ab\u00a0particules\u00a0\u00bb (12800\u00b3) dans un espace de 9,6 milliards d\u2019<a id=\"acttrigger0\" class=\"act_anchor trigger21789\" href=\"https:\/\/trustmyscience.com\/annee-lumiere\/\" target=\"_blank\" rel=\"noopener noreferrer\">ann\u00e9es-lumi\u00e8re<\/a>.<\/p>\n<p>La simulation mod\u00e9lise l\u2019\u00e9volution d\u2019un univers virtuel sur plus de 13 milliards d\u2019ann\u00e9es. Elle ne se concentre pas sur la formation des \u00e9toiles et des plan\u00e8tes, mais \u00e9tudie plut\u00f4t le comportement de la mati\u00e8re noire dans un univers en expansion. Cependant, \u00ab les prochaines versions comprendront des cartes de\u00a0<a id=\"acttrigger1\" class=\"act_anchor trigger62719\" href=\"https:\/\/trustmyscience.com\/observer-galaxies-lointaines-graces-aux-telescopes-gravitationnels\/\" target=\"_blank\" rel=\"noopener noreferrer\">lentilles gravitationnelles<\/a>\u00a0et des catalogues de\u00a0<a id=\"acttrigger2\" class=\"act_anchor trigger21753\" href=\"https:\/\/trustmyscience.com\/galaxie\/\" target=\"_blank\" rel=\"noopener noreferrer\">galaxies<\/a>\u00a0fictives, d\u2019amas de rayons X et de noyaux actifs de\u00a0<a id=\"acttrigger3\" class=\"act_anchor trigger62690\" href=\"https:\/\/trustmyscience.com\/galaxie\/\" target=\"_blank\" rel=\"noopener noreferrer\">galaxie<\/a>\u00a0\u00bb, \u00e9crivent les chercheurs dans leur document.<\/p>\n<p>Le niveau de d\u00e9tail d\u2019Uchuu est suffisamment \u00e9lev\u00e9 pour que l\u2019\u00e9quipe puisse identifier l\u2019ensemble des objets cosmiques connus, des amas de galaxies aux halos de mati\u00e8re noire des galaxies individuelles. Comme la mati\u00e8re noire constitue la majeure partie de la mati\u00e8re de l\u2019Univers, elle est le principal moteur de la formation des galaxies et des amas.<\/p>\n<figure id=\"attachment_71142\" class=\"wp-caption aligncenter embed-vis\" aria-describedby=\"caption-attachment-71142\"><picture class=\"wp-image-71142\" style=\"box-sizing: border-box; display: block;\" data-attachment-id=\"71142\" data-permalink=\"https:\/\/trustmyscience.com\/chercheurs-genere-univers-virtuel-complet-telechargeable\/distribution-matiere-noire-simulations-uchuu\/\" data-orig-file=\"https:\/\/trustmyscience.com\/wp-content\/uploads\/2021\/09\/distribution-matiere-noire-simulations-uchuu.jpg\" data-orig-size=\"700,420\" data-comments-opened=\"1\" data-image-meta=\"{&quot;aperture&quot;:&quot;0&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;0&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;0&quot;,&quot;iso&quot;:&quot;0&quot;,&quot;shutter_speed&quot;:&quot;0&quot;,&quot;title&quot;:&quot;&quot;,&quot;orientation&quot;:&quot;0&quot;}\" data-image-title=\"distribution-matiere-noire-simulations-uchuu\" data-image-description=\"\" data-image-caption=\"&lt;p&gt;Distributions de mati\u00e8re noire \u00e0 partir des simulations Uchuu, \u00e0 diff\u00e9rentes \u00e9chelles. \u00a9 Ishiyama et. al, MNRAS, 2021&lt;\/p&gt;\" data-medium-file=\"https:\/\/trustmyscience.com\/wp-content\/uploads\/2021\/09\/distribution-matiere-noire-simulations-uchuu-300x180.jpg\" data-large-file=\"https:\/\/trustmyscience.com\/wp-content\/uploads\/2021\/09\/distribution-matiere-noire-simulations-uchuu.jpg\"><source srcset=\"https:\/\/trustmyscience.com\/wp-content\/uploads\/2021\/09\/distribution-matiere-noire-simulations-uchuu.jpg.webp 700w, https:\/\/trustmyscience.com\/wp-content\/uploads\/2021\/09\/distribution-matiere-noire-simulations-uchuu-300x180.jpg.webp 300w, https:\/\/trustmyscience.com\/wp-content\/uploads\/2021\/09\/distribution-matiere-noire-simulations-uchuu-500x300.jpg.webp 500w, https:\/\/trustmyscience.com\/wp-content\/uploads\/2021\/09\/distribution-matiere-noire-simulations-uchuu-472x283.jpg.webp 472w, https:\/\/trustmyscience.com\/wp-content\/uploads\/2021\/09\/distribution-matiere-noire-simulations-uchuu-390x234.jpg.webp 390w\" type=\"image\/webp\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><img loading=\"lazy\" decoding=\"async\" class=\"lazyloaded\" style=\"box-sizing: border-box; max-width: 100%; height: auto; border: 0px; vertical-align: top;\" src=\"https:\/\/trustmyscience.com\/wp-content\/uploads\/2021\/09\/distribution-matiere-noire-simulations-uchuu.jpg\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" srcset=\"https:\/\/trustmyscience.com\/wp-content\/uploads\/2021\/09\/distribution-matiere-noire-simulations-uchuu.jpg 700w, https:\/\/trustmyscience.com\/wp-content\/uploads\/2021\/09\/distribution-matiere-noire-simulations-uchuu-300x180.jpg 300w, https:\/\/trustmyscience.com\/wp-content\/uploads\/2021\/09\/distribution-matiere-noire-simulations-uchuu-500x300.jpg 500w, https:\/\/trustmyscience.com\/wp-content\/uploads\/2021\/09\/distribution-matiere-noire-simulations-uchuu-472x283.jpg 472w, https:\/\/trustmyscience.com\/wp-content\/uploads\/2021\/09\/distribution-matiere-noire-simulations-uchuu-390x234.jpg 390w\" alt=\"distribution matiere noire simulations uchuu\" width=\"800\" height=\"480\" data-attachment-id=\"71142\" data-permalink=\"https:\/\/trustmyscience.com\/chercheurs-genere-univers-virtuel-complet-telechargeable\/distribution-matiere-noire-simulations-uchuu\/\" data-orig-file=\"https:\/\/trustmyscience.com\/wp-content\/uploads\/2021\/09\/distribution-matiere-noire-simulations-uchuu.jpg\" data-orig-size=\"700,420\" data-comments-opened=\"1\" data-image-meta=\"{&quot;aperture&quot;:&quot;0&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;0&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;0&quot;,&quot;iso&quot;:&quot;0&quot;,&quot;shutter_speed&quot;:&quot;0&quot;,&quot;title&quot;:&quot;&quot;,&quot;orientation&quot;:&quot;0&quot;}\" data-image-title=\"distribution-matiere-noire-simulations-uchuu\" data-image-description=\"\" data-image-caption=\"&lt;p&gt;Distributions de mati\u00e8re noire \u00e0 partir des simulations Uchuu, \u00e0 diff\u00e9rentes \u00e9chelles. \u00a9 Ishiyama et. al, MNRAS, 2021&lt;\/p&gt;\" data-medium-file=\"https:\/\/trustmyscience.com\/wp-content\/uploads\/2021\/09\/distribution-matiere-noire-simulations-uchuu-300x180.jpg\" data-large-file=\"https:\/\/trustmyscience.com\/wp-content\/uploads\/2021\/09\/distribution-matiere-noire-simulations-uchuu.jpg\" data-ll-status=\"loaded\" \/><\/picture><figcaption id=\"caption-attachment-71142\" class=\"wp-caption-text\">Distributions de mati\u00e8re noire \u00e0 partir des simulations Uchuu, \u00e0 diff\u00e9rentes \u00e9chelles. \u00a9 Ishiyama et. al, MNRAS, 2021<\/figcaption><\/figure>\n<p>Comme vous pouvez l\u2019imaginer, la puissance de calcul et la capacit\u00e9 de stockage n\u00e9cessaires pour cr\u00e9er un mod\u00e8le aussi d\u00e9taill\u00e9 sont ahurissantes. L\u2019\u00e9quipe a utilis\u00e9 le superordinateur japonais sp\u00e9cialement con\u00e7u pour l\u2019astronomie ATERUI II, qui poss\u00e8de plus de 40 000 coeurs. Pour un ordinateur commun, un total de 20 millions d\u2019heures de calcul aurait \u00e9t\u00e9 n\u00e9cessaire pour g\u00e9n\u00e9rer la simulation, produisant plus de 3 p\u00e9taoctets de donn\u00e9es (3000 t\u00e9raoctets).<\/p>\n<p>3000 t\u00e9raoctets de donn\u00e9es (soit 360 000 films HD)<br \/>\nCela repr\u00e9sente 3000 To (soit 3 millions de Go, ou 360 000 films HD). Gr\u00e2ce \u00e0 une compression \u00e0 haute densit\u00e9, l\u2019\u00e9quipe a toutefois r\u00e9ussi \u00e0 compresser les donn\u00e9es dans un espace de stockage de 100 To seulement. Cela reste certes impressionnant, mais \u00e7a a l\u2019avantage d\u2019\u00eatre stockable sur un seul disque. Vous pouvez acc\u00e9der aux donn\u00e9es via GitHub (liens sur skiesanduniverses.org), o\u00f9 l\u2019\u00e9quipe d\u2019Uchuu a t\u00e9l\u00e9vers\u00e9 ses donn\u00e9es brutes.<\/p>\n<p>En plus d\u2019\u00eatre une simulation cosmique d\u00e9taill\u00e9e, Uchuu peut \u00eatre utilis\u00e9e par tout astrophysicien n\u00e9cessitant des donn\u00e9es de simulation. Au fur et \u00e0 mesure que de grandes \u00e9tudes du ciel et d\u2019autres simulations seront cr\u00e9\u00e9es, les donn\u00e9es deviendront si volumineuses que les technologies d\u2019extraction et de compression des donn\u00e9es joueront un r\u00f4le crucial dans la recherche en astrophysique.<\/p>\n<p>Sources : <a href=\"https:\/\/trustmyscience.com\/chercheurs-genere-univers-virtuel-complet-telechargeable\/\">https:\/\/trustmyscience.com\/chercheurs-genere-univers-virtuel-complet-telechargeable\/<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Cette derni\u00e8re d\u00e9cennie marque un tournant majeur pour l\u2019\u00e9tude et la compr\u00e9hension de l\u2019Univers et de son \u00e9volution, notamment gr\u00e2ce \u00e0 de nouveaux environnements virtuels de simulation permettant aux scientifiques de g\u00e9n\u00e9rer des univers virtuels avec un niveau de d\u00e9tails impressionnant, afin d\u2019en \u00e9tudier certains m\u00e9canismes. R\u00e9cemment, des chercheurs ont produit la simulation la plus [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":88,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[6],"tags":[],"class_list":["post-87","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-sciences"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.2 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Des chercheurs ont g\u00e9n\u00e9r\u00e9 un univers virtuel complet, et c\u2019est t\u00e9l\u00e9chargeable\u2026 - Victor BRUNET<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/victorbrunet.fr\/index.php\/2021\/09\/14\/des-chercheurs-ont-genere-un-univers-virtuel-complet-et-cest-telechargeable\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Des chercheurs ont g\u00e9n\u00e9r\u00e9 un univers virtuel complet, et c\u2019est t\u00e9l\u00e9chargeable\u2026 - Victor BRUNET\" \/>\n<meta property=\"og:description\" content=\"Cette derni\u00e8re d\u00e9cennie marque un tournant majeur pour l\u2019\u00e9tude et la compr\u00e9hension de l\u2019Univers et de son \u00e9volution, notamment gr\u00e2ce \u00e0 de nouveaux environnements virtuels de simulation permettant aux scientifiques de g\u00e9n\u00e9rer des univers virtuels avec un niveau de d\u00e9tails impressionnant, afin d\u2019en \u00e9tudier certains m\u00e9canismes. 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