{"id":910,"date":"2017-12-01T16:41:44","date_gmt":"2017-12-01T15:41:44","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/barrau\/?p=910"},"modified":"2017-12-05T09:26:31","modified_gmt":"2017-12-05T08:26:31","slug":"lantimatiere-revelateur-de-matiere-noire","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/barrau\/2017\/12\/01\/lantimatiere-revelateur-de-matiere-noire\/","title":{"rendered":"L\u2019antimati\u00e8re vient-elle de r\u00e9v\u00e9ler la mati\u00e8re noire ?"},"content":{"rendered":"<p>Nous avons aujourd\u2019hui de tr\u00e8s bonne raisons de croire que l\u2019essentiel de la masse de l\u2019Univers est de nature inconnue. C\u2019est ce qu\u2019on nomme l\u2019\u00e9nigme de la mati\u00e8re noire. Il y a bien quelques explications alternatives mais elle sont de moins en moins convaincantes. Et cette mati\u00e8re noire est tout de m\u00eame environ 40 fois plus abondante que les \u00e9toiles dans l\u2019Univers ! Elle est donc tout sauf un d\u00e9tail \u2026<\/p>\n<p>Il est possible que la mati\u00e8re noire soit compos\u00e9e de particules massives non-encore observ\u00e9es directement. Il \u00e9tait esp\u00e9r\u00e9 que l\u2019acc\u00e9l\u00e9rateur LHC du CERN produise de telles particules mais jusqu\u2019\u00e0 ce jour ce n\u2019est h\u00e9las pas le cas. Pourtant tout n\u2019est pas perdu : ces particules pourraient s\u2019annihiler lorsqu\u2019elles se rencontrent dans l\u2019espace. Or, lors de leur annihilation ces corpuscules de mati\u00e8re noire doivent \u00e9mettre autant de mati\u00e8re que d\u2019antimati\u00e8re. (Il n\u2019est absolument pas question de dire que la mati\u00e8re noire serait de l\u2019antimati\u00e8re.)<\/p>\n<figure id=\"attachment_906\" aria-describedby=\"caption-attachment-906\" style=\"width: 980px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/blogs.futura-sciences.com\/barrau\/wp-content\/uploads\/sites\/12\/2017\/12\/landscape-1491071000-matteranti.jpg\" alt=\"\" width=\"980\" height=\"490\" class=\"size-full wp-image-906\" srcset=\"https:\/\/blogs.futura-sciences.com\/barrau\/wp-content\/uploads\/sites\/12\/2017\/12\/landscape-1491071000-matteranti.jpg 980w, https:\/\/blogs.futura-sciences.com\/barrau\/wp-content\/uploads\/sites\/12\/2017\/12\/landscape-1491071000-matteranti-450x225.jpg 450w, https:\/\/blogs.futura-sciences.com\/barrau\/wp-content\/uploads\/sites\/12\/2017\/12\/landscape-1491071000-matteranti-768x384.jpg 768w\" sizes=\"auto, (max-width: 980px) 100vw, 980px\" \/><figcaption id=\"caption-attachment-906\" class=\"wp-caption-text\">(via le site Socratic Astrophysics)<\/figcaption><\/figure>\n<p><!--more--> <\/p>\n<p>L\u2019antimati\u00e8re n\u2019est pas une entit\u00e9 myst\u00e9rieuse. Elle a \u00e9t\u00e9 comprise du point de vue th\u00e9orique et d\u00e9couverte du point de vue exp\u00e9rimentale dans les ann\u00e9es 1930. Mais ce qui est int\u00e9ressant ici est qu\u2019il y en a relativement peu dans l\u2019Univers. Si donc la rencontre de deux particules de mati\u00e8re noire engendrait une quantit\u00e9 notable d\u2019antimati\u00e8re, il pourrait \u00eatre possible de \u00ab voir \u00bb la mati\u00e8re noire via un exc\u00e8s d\u2019antimati\u00e8re. <\/p>\n<p>Les exp\u00e9riences spatiales PAMELA et AMS on effectivement d\u00e9tect\u00e9 un exc\u00e8s d\u2019antimati\u00e8re. Cela a naturellement conduit \u00e0 imaginer qu\u2019il pourrait s\u2019agir d\u2019une cons\u00e9quence de la mati\u00e8re noire ! Mais rapidement il est apparu qu\u2019une explication astrophysique plus \u00ab simple \u00bb, fond\u00e9e sur le fait que les pulsars \u00e9mettent de l\u2019antimati\u00e8re \u00e9tait sans doute plus vraisemblable. C\u2019est \u00e9galement mon avis. <\/p>\n<figure id=\"attachment_908\" aria-describedby=\"caption-attachment-908\" style=\"width: 660px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/blogs.futura-sciences.com\/barrau\/wp-content\/uploads\/sites\/12\/2017\/12\/53620102_53620100.jpg\" alt=\"\" width=\"660\" height=\"371\" class=\"size-full wp-image-908\" srcset=\"https:\/\/blogs.futura-sciences.com\/barrau\/wp-content\/uploads\/sites\/12\/2017\/12\/53620102_53620100.jpg 660w, https:\/\/blogs.futura-sciences.com\/barrau\/wp-content\/uploads\/sites\/12\/2017\/12\/53620102_53620100-450x253.jpg 450w\" sizes=\"auto, (max-width: 660px) 100vw, 660px\" \/><figcaption id=\"caption-attachment-908\" class=\"wp-caption-text\">Collision d&#8217;amas corroborant l&#8217;existence de mati\u00e8re noire (NASA\/ESA\/ESO\/CXC\/COE\/MERTEN)<\/figcaption><\/figure>\n<p>R\u00e9cemment, l\u2019instrument HAWC vient de publier dans Science <a href=\"http:\/\/science.sciencemag.org\/content\/358\/6365\/911\">un article<\/a> qui tend \u00e0 soutenir le fait que cette antimati\u00e8re viendrait en fait de la mati\u00e8re noire car les pulsars observ\u00e9s ne pr\u00e9sentent pas les caract\u00e9ristiques requises pour en faire des sources efficaces pour les positons (anti-\u00e9lectrons) observ\u00e9s en exc\u00e8s. Il s\u2019ensuivrait que AMS aurait bien \u00ab vu \u00bb la mati\u00e8re noire via l\u2019antimati\u00e8re puisque l\u2019explication alternative serait \u00e9cart\u00e9e !<\/p>\n<figure id=\"attachment_907\" aria-describedby=\"caption-attachment-907\" style=\"width: 600px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/blogs.futura-sciences.com\/barrau\/wp-content\/uploads\/sites\/12\/2017\/12\/HAWC_from_LMT_Aug_19_2014_01.jpg\" alt=\"\" width=\"600\" height=\"255\" class=\"size-full wp-image-907\" srcset=\"https:\/\/blogs.futura-sciences.com\/barrau\/wp-content\/uploads\/sites\/12\/2017\/12\/HAWC_from_LMT_Aug_19_2014_01.jpg 600w, https:\/\/blogs.futura-sciences.com\/barrau\/wp-content\/uploads\/sites\/12\/2017\/12\/HAWC_from_LMT_Aug_19_2014_01-450x191.jpg 450w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/><figcaption id=\"caption-attachment-907\" class=\"wp-caption-text\">Observatoire HAWC (source Wikipedia)<\/figcaption><\/figure>\n<p>Mais l\u2019histoire des sciences est pleine de rebondissement et d\u00e8s les jours qui suivent la publication de HAWC des objections (que je partage) ont \u00e9t\u00e9 \u00e9mises. En particulier, le coefficient de diffusion qui a \u00e9t\u00e9 mesur\u00e9 n\u2019est pas en r\u00e9alit\u00e9 celui qui est n\u00e9cessaire pour conduire \u00e0 la conclusion obtenue.<\/p>\n<p>\u00c0 ce stade le lien entre antimati\u00e8re et mati\u00e8re noire n\u2019est donc pas \u00e9tabli. Le myst\u00e8re de la mati\u00e8re noire reste entier ! <\/p>\n<!-- AddThis Advanced Settings generic via filter on the_content --><!-- AddThis Share Buttons generic via filter on the_content -->","protected":false},"excerpt":{"rendered":"<p>Nous avons aujourd\u2019hui de tr\u00e8s bonne raisons de croire que l\u2019essentiel de la masse de l\u2019Univers est de nature inconnue. C\u2019est ce qu\u2019on nomme l\u2019\u00e9nigme de la mati\u00e8re noire. Il y a bien quelques explications alternatives mais elle sont de moins en moins convaincantes. Et cette mati\u00e8re noire est tout de m\u00eame environ 40 fois &hellip; <a href=\"https:\/\/blogs.futura-sciences.com\/barrau\/2017\/12\/01\/lantimatiere-revelateur-de-matiere-noire\/\" class=\"more-link\">Continuer la lecture de <span class=\"screen-reader-text\">L\u2019antimati\u00e8re vient-elle de r\u00e9v\u00e9ler la mati\u00e8re noire ?<\/span>  <span class=\"meta-nav\">&rarr;<\/span><\/a><!-- AddThis Advanced Settings generic via filter on get_the_excerpt --><!-- AddThis Share Buttons generic via filter on get_the_excerpt --><\/p>\n","protected":false},"author":10,"featured_media":909,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[8],"tags":[102,101,103,11],"class_list":["post-910","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-cosmos","tag-ams","tag-antimatiere","tag-hawc","tag-matiere-noire"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>L\u2019antimati\u00e8re vient-elle de r\u00e9v\u00e9ler la mati\u00e8re noire ?, par Aur\u00e9lien BARRAU<\/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:\/\/blogs.futura-sciences.com\/barrau\/2017\/12\/01\/lantimatiere-revelateur-de-matiere-noire\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"L\u2019antimati\u00e8re vient-elle de r\u00e9v\u00e9ler la mati\u00e8re noire ?, par Aur\u00e9lien BARRAU\" \/>\n<meta property=\"og:description\" content=\"Nous avons aujourd\u2019hui de tr\u00e8s bonne raisons de croire que l\u2019essentiel de la masse de l\u2019Univers est de nature inconnue. 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