{"id":10253,"date":"2023-11-24T22:20:40","date_gmt":"2023-11-24T22:20:40","guid":{"rendered":"https:\/\/www.africa-press.net\/sao-tome-e-principe\/politique\/amaterasu-la-particule-dultra-haute-energie-venue-de-nulle-part"},"modified":"2023-11-24T23:44:57","modified_gmt":"2023-11-24T23:44:57","slug":"amaterasu-la-particule-dultra-haute-energie-venue-de-nulle-part","status":"publish","type":"post","link":"https:\/\/www.africa-press.net\/sao-tome-e-principe\/toutes-les-actualites\/amaterasu-la-particule-dultra-haute-energie-venue-de-nulle-part","title":{"rendered":"\u201cAmaterasu\u201d, la particule d\u2019ultra haute \u00e9nergie venue de nulle part"},"content":{"rendered":"

Africa-Press – S\u00e3o Tom\u00e9 e Pr\u00edncipe. <\/strong><\/span>D\u2019ou\u0300 vient-elle ? Quel me\u0301canisme a pu l\u2019engendrer ? Les questions se bousculent autour d\u2019une particule d\u2019ultra-haute e\u0301nergie de\u0301tecte\u0301e le 27 mai 2021, mais dont l\u2019e\u0301tude est a\u0300 parai\u0302tre dans la revue Science ce vendredi 24 novembre.<\/p>\n

Une particule que rien n\u2019a pu produire dans notre galaxie, ou celles qui la voisinent<\/b><\/p>\n

Selon les chercheurs de l\u2019Universite\u0301 d\u2019Osaka (Japon), l\u2019e\u0301nergie de ce rayon cosmique est de 244.1018 eV. Cela repre\u0301sente 40 joules, soit environ la moitie\u0301 de l\u2019e\u0301nergie cine\u0301tique d\u2019une balle de tennis a\u0300 200 km\/h, mais porte\u0301e par une seule particule, sans doute un proton selon les chercheurs.<\/p>\n

Rien dans notre galaxie n\u2019a le pouvoir de la produire, ni dans les galaxies proches. Cette e\u0301trange particule a e\u0301te\u0301 baptise\u0301e \u201cAmaterasu\u201d, du nom de la plus importante divinite\u0301 de la religion shintoi\u0308que.<\/p>\n

\u201cOh-My-God\u201d versus \u201cAmaterasu\u201d<\/b><\/p>\n

Son arrive\u0301e a e\u0301te\u0301 enregistre\u0301e par le Telescope Array, un re\u0301seau de 507 de\u0301tecteurs re\u0301partis sur 700 km2 dans l\u2019Utah (Etats-Unis). Une vaste surface ne\u0301cessaire puisque la probabilite\u0301 d\u2019observer un e\u0301ve\u0301nement de ce genre est seulement d\u2019une particule par sie\u0300cle et par km2.<\/p>\n

Ainsi, aucune particule de ce niveau n\u2019avait e\u0301te\u0301 observe\u0301e depuis 1991 et \u201cOh-my-God\u201d, dont l\u2019e\u0301nergie atteignait 320.1018 eV, encore un peu plus que \u201cAmaterasu\u201d.<\/p>\n

Leur rarete\u0301 les rend donc difficiles a\u0300 e\u0301tudier, et Amaterasu semble bien de\u0301cide\u0301e a\u0300 compliquer particulie\u0300rement la ta\u0302che des chercheurs. En effet, e\u0301tant donne\u0301 leur extraordinaire e\u0301nergie, ces particules ne sont pas du genre a\u0300 de\u0301vier de leur trajectoire. Donc, pour trouver leur lieu de naissance, il suffirait en the\u0301orie de remonter sa trace en ligne droite. Ce que les chercheurs de la collaboration Telescope Array ont fait…<\/p>\n

L\u2019ennui, c\u2019est qu\u2019ils sont tombe\u0301s sur une structure bien particulie\u0300re de l\u2019Univers : un vide cosmique, autrement dit une bulle gigantesque de\u0301pourvue de galaxies, ou presque.<\/p>\n

Une particule surgit du vide cosmique<\/b><\/p>\n

Il semble bien improbable qu\u2019une telle particule de\u0301bordante d\u2019e\u0301nergie ait surgi de nulle part. D\u2019autant plus que les candidats naturels a\u0300 leur fabrication sont les e\u0301ve\u0301nements les plus violents de l\u2019Univers, a\u0300 savoir les formations et collisions de trous noirs supermassifs. Des astres tapis au c\u0153ur des galaxies, et non dans le vide interside\u0301ral…<\/p>\n

Malgre\u0301 tout, les chercheurs ont plusieurs sce\u0301narios pour expliquer Amaterasu. La particule, charge\u0301e e\u0301lectriquement, a pu e\u0302tre de\u0301vie\u0301e par un champ magne\u0301tique extragalactique mais encore une fois, son e\u0301nergie aurait du\u0302 la maintenir sur les rails. Il faudrait donc supposer que ces champs sont beaucoup plus intenses que pre\u0301vu.<\/p>\n

Autre solution : la particule aurait e\u0301te\u0301 e\u0301mise dans notre environnement galactique proche, et non dans ce vide cosmique lointain, mais par un e\u0301ve\u0301nement qui serait demeure\u0301 fort discret puisqu\u2019aucun sursaut gamma ou autre brutale libe\u0301ration d\u2019e\u0301nergie n\u2019a e\u0301te\u0301 de\u0301tecte\u0301e.<\/p>\n

Dernie\u0300re possibilite\u0301, de loin la plus excitante : cette particule serait issue d\u2019une physique inconnue, au-dela\u0300 du mode\u0300le standard de la physique des particules. Pour en savoir plus, les chercheurs vont devoir ajouter d\u2019autres particules d\u2019ultra-haute e\u0301nergie a\u0300 leur tableau de chasse, et si possible pas une tous les trente ans.<\/p>\n

Dans ce but, la sensibilite\u0301 de l\u2019expe\u0301rience Telescope Array va e\u0302tre conside\u0301rablement augmente\u0301e avec le prochain ajout de 500 nouveaux de\u0301tecteurs, passant la surface de capture a\u0300 2900 km2… Avec une sensibilite\u0301 multiplie\u0301e par 4, la hotte des chasseurs de particules devrait rapidement se remplir.<\/p>\n

Pour plus d’informations et d’analyses sur la S\u00e3o Tom\u00e9 e Pr\u00edncipe<\/a>, suivez Africa-Press<\/a><\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"

Africa-Press – S\u00e3o Tom\u00e9 e Pr\u00edncipe. D\u2019ou\u0300 vient-elle ? Quel me\u0301canisme a pu l\u2019engendrer ? Les questions se bousculent autour d\u2019une particule d\u2019ultra-haute e\u0301nergie de\u0301tecte\u0301e le 27 mai 2021, mais dont l\u2019e\u0301tude est a\u0300 parai\u0302tre dans la revue Science ce vendredi 24 novembre. Une particule que rien n\u2019a pu produire dans notre galaxie, ou celles […]<\/p>\n","protected":false},"author":82,"featured_media":10252,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[22,10],"tags":[36,55,56],"class_list":["post-10253","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-divers","category-toutes-les-actualites","tag-africa-press","tag-africa-press-sao-tome-e-principe","tag-sao-tome-e-principe"],"yoast_head":"\n\u201cAmaterasu\u201d, la particule d\u2019ultra haute \u00e9nergie venue de nulle part - S\u00e3o Tom\u00e9 e Pr\u00edncipe<\/title>\n<meta name=\"description\" content=\"D\u2019ou\u0300 vient-elle ? Quel me\u0301canisme a pu l\u2019engendrer ? 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