{"id":2088,"date":"2014-06-09T21:33:58","date_gmt":"2014-06-09T19:33:58","guid":{"rendered":"http:\/\/reperes-astro.fr\/?p=2088"},"modified":"2025-01-14T18:55:48","modified_gmt":"2025-01-14T17:55:48","slug":"merci-monsieur-klein-pour-ces-deux-metaphores","status":"publish","type":"post","link":"https:\/\/reperes-astro.fr\/merci-monsieur-klein-pour-ces-deux-metaphores\/","title":{"rendered":"MERCI monsieur KLEIN pour ces deux m\u00e9taphores"},"content":{"rendered":"\n<p>J&rsquo;ai le plaisir de vous retranscrire deux m\u00e9taphores tir\u00e9es du livre \u00ab\u00a0le monde selon Etienne Klein\u00a0\u00bb. Tir\u00e9es de la chronique du 10 octobre 2013 sur France Culture : Les grandes le\u00e7ons d&rsquo;un petit boson&#8230;<\/p>\n\n\n\n<p>Selon la physique classique, celle de grand papa, si une particule agit sur une autre, c&rsquo;est qu&rsquo;un champ, engendr\u00e9 par la premi\u00e8re, se propage dans l&rsquo;espace puis agit sur la seconde.<\/p>\n\n\n\n<p>Dans le cadre de la physique quantique, pour qu&rsquo;il y ait interaction entre deux particules, il faut qu&rsquo;elles \u00e9changent \u00ab\u00a0quelque chose\u00a0\u00bb et ce quelque chose est une particule caract\u00e9ristique de l&rsquo;interaction.<\/p>\n\n\n\n<p>En d&rsquo;autres termes, une interaction ne s&rsquo;exerce entre deux particules que par l&rsquo;\u00e9change d&rsquo;une troisi\u00e8me qu&rsquo;en termes savant on appelle \u00ab\u00a0le boson de jauge\u00a0\u00bb de l&rsquo;interaction.<\/p>\n\n\n\n<p>PREMIERE METAPHORE<\/p>\n\n\n\n<p>Imaginons deux barques sur un lac.<\/p>\n\n\n\n<p>Chaque occupant est d\u00e9muni de tout esp\u00e8ce de d&rsquo;objet qui pourrait l&rsquo;aider \u00e0 diriger son embarcation&#8230;.(il n&rsquo;a ni rame,s ni pagaies)<\/p>\n\n\n\n<p>Supposons que les eux barques se dirigent l&rsquo;une vers l&rsquo;autre de telle sorte que leur collision paraisse in\u00e9vitable.<\/p>\n\n\n\n<p>INEVITABLE ? Pas tout \u00e0 fait.<\/p>\n\n\n\n<p>Si l&rsquo;un des occupants dispose d&rsquo;un objet massif, par exemple un ballon, et le lance au passager de l&rsquo;autre barque qui lui renverra et ainsi de suite, les deux embarcations s&rsquo;\u00e9loigneront progressivement l&rsquo;une de l&rsquo;autre&#8230;<\/p>\n\n\n\n<p>Par l&rsquo;entremise d&rsquo;un m\u00e9diateur spatial, en l&rsquo;occurrence le ballon, la succession de lancers aura cr\u00e9\u00e9 une force r\u00e9pulsive capable de modifier les trajectoires.<\/p>\n\n\n\n<p>Bien qu&rsquo;approximative, donc critiquable, cette image en forme de tour de passes passe permet de comprendre une chose importante : puisqu&rsquo;un ballon lourd nous condamne \u00e0 ne faire des passes courtes, la port\u00e9e d&rsquo;une interaction sera d&rsquo;autant plus faible que la masse de ses ballons sera plus \u00e9lev\u00e9e.<\/p>\n\n\n\n<p>Quatre interactions ont \u00e9t\u00e9 identifi\u00e9es \u00e0 ce jour dans l&rsquo;univers : la gravitation et les interactions \u00e9lectromagn\u00e9tiques, faible et forte&#8230;.<\/p>\n\n\n\n<p>&#8230;<\/p>\n\n\n\n<p>Mais ce mod\u00e8le standard posait un probl\u00e8me irritant : il impliquait que les particules m\u00e9diatrices des intreactions (les ballons) devaient avoir une masse nulle!<\/p>\n\n\n\n<p>C&rsquo;est bien le cas du photon m\u00e9diateur de l&rsquo;interaction \u00e9lectromagn\u00e9tique mais pas du tout celui des ballons qui m\u00e9diatisent l&rsquo;interaction faible dont la masse vaut 100 fois celle d&rsquo;un proton&#8230;<\/p>\n\n\n\n<p>En 1964, Fran\u00e7ois ENGLERT, Robert BROUT puis Peter HIGGS ont propos\u00e9 une solution permettant de r\u00e9concilier le mod\u00e8le standrad et les donn\u00e9es empiriques&#8230;<\/p>\n\n\n\n<p>Ils postulent l&rsquo;existence d&rsquo;un CHAMP emplissant tout l&rsquo;espace et avec le quel les particules \u00e9l\u00e9mentaires effectivement sans masse, interagissent. Cette interaction a pour effet d&rsquo;entraver leurs mouvements de la m\u00eame fa\u00e7on que si elles avaient une masse. Celle ci r\u00e9sulterait du frottement \u00e0 ce champ que contient le vide&nbsp; qu&rsquo;on appelle \u00a0\u00bb le champ de Higgs\u00a0\u00bb.<\/p>\n\n\n\n<p>DEUXIEME METAPHORE<\/p>\n\n\n\n<p>Tout se passe comme si les particules \u00e9l\u00e9mentaires \u00e9taient dot\u00e9es de skis pour se d\u00e9placer sur un champ de neige qui serait l&rsquo;\u00e9quivalent du \u00ab\u00a0champ de Higgs\u00a0\u00bb.<\/p>\n\n\n\n<p>Les particules qui ont bien \u00ab\u00a0fart\u00e9\u00a0\u00bb se d\u00e9placent frottement \u00e0 la vitesse de la lumi\u00e8re et leur masse est donc nulle.<\/p>\n\n\n\n<p>Celles dont les skis sont mal fart\u00e9s glissent mal sur la neige, leur vitesse est moindre que celle de la lumi\u00e8re et leur masse apparente est donc non nulle.<\/p>\n\n\n\n<p>La masse ne serait donc qu&rsquo;une mesure de la mauvaise qualit\u00e9 du fartage des skis des particules. ce n&rsquo;est pas exactement ce que l&rsquo;on apprend dans les manuels scolaires.<\/p>\n\n\n\n<p>Je ne sais si cela va vous aider \u00e0 appr\u00e9hender les futures d\u00e9couvertes ( notamment celles du CERN) mais ce bouquin est plein de ressources et je vous conseille sa lecture.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Toujours fana des anagrammes Mr KLEIN nous r\u00e9gale encore :<\/h4>\n\n\n\n<p>Le \u00ab\u00a0boson scalaire de Higgs\u00a0\u00bb est l&rsquo;anagramme de \u00ab\u00a0l&rsquo;horloge des anges ici bas\u00a0\u00bb<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Vous trouverez ci dessous une photo que nous avons prise en 2006 dans le parc du&nbsp; CERN ( merci Arno).<\/h4>\n\n\n\n<p>C&rsquo;est la chambre \u00e0 bulle nomm\u00e9e GARGAMELLE (1000 tonnes et 12m de long) qui a notamment permis de mettre en \u00e9vidence un boson porteur de la force faible (boson Z) dont&nbsp; les th\u00e9oriciens avaient pr\u00e9dit l&rsquo;existence.<\/p>\n\n\n\n<p>Si j&rsquo;ai bien tout compris, la chambre est remplie d&rsquo;un liquide (habituellement de l&rsquo;hydrog\u00e8ne mais ici du fr\u00e9on plus sensible) qui freine la particule et le met en \u00e9vidence?<\/p>\n\n\n\n<p>Plac\u00e9e dans un fort champ magn\u00e9tique, la trajectoire est d\u00e9vi\u00e9e et son image va permettre de trouver les caract\u00e9ristiques&nbsp; de la particule recherch\u00e9e.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full is-resized\"><a href=\"https:\/\/reperes-astro.fr\/%77%70%2d%63%6f%6e%74%65%6e%74\/uploads\/2014\/06\/chambre-\u00e0-bulles-sde-25m.jpg\"><img loading=\"lazy\" decoding=\"async\" width=\"640\" height=\"426\" src=\"https:\/\/reperes-astro.fr\/%77%70%2d%63%6f%6e%74%65%6e%74\/uploads\/2014\/06\/chambre-\u00e0-bulles-sde-25m.jpg\" alt=\"\" class=\"wp-image-2093\" style=\"width:630px\" title=\"chambre \u00e0 bulles sde 25m\" srcset=\"https:\/\/reperes-astro.fr\/%77%70%2d%63%6f%6e%74%65%6e%74\/uploads\/2014\/06\/chambre-\u00e0-bulles-sde-25m.jpg 640w, https:\/\/reperes-astro.fr\/%77%70%2d%63%6f%6e%74%65%6e%74\/uploads\/2014\/06\/chambre-\u00e0-bulles-sde-25m-300x200.jpg 300w\" sizes=\"auto, (max-width: 640px) 100vw, 640px\" \/><\/a><\/figure>\n<\/div>\n\n\n<p><\/p>\n<div class=\"pvc_clear\"><\/div><p id=\"pvc_stats_2088\" class=\"pvc_stats all  \" data-element-id=\"2088\" style=\"\"><i class=\"pvc-stats-icon medium\" aria-hidden=\"true\"><svg aria-hidden=\"true\" focusable=\"false\" data-prefix=\"far\" data-icon=\"chart-bar\" role=\"img\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewBox=\"0 0 512 512\" class=\"svg-inline--fa fa-chart-bar fa-w-16 fa-2x\"><path fill=\"currentColor\" d=\"M396.8 352h22.4c6.4 0 12.8-6.4 12.8-12.8V108.8c0-6.4-6.4-12.8-12.8-12.8h-22.4c-6.4 0-12.8 6.4-12.8 12.8v230.4c0 6.4 6.4 12.8 12.8 12.8zm-192 0h22.4c6.4 0 12.8-6.4 12.8-12.8V140.8c0-6.4-6.4-12.8-12.8-12.8h-22.4c-6.4 0-12.8 6.4-12.8 12.8v198.4c0 6.4 6.4 12.8 12.8 12.8zm96 0h22.4c6.4 0 12.8-6.4 12.8-12.8V204.8c0-6.4-6.4-12.8-12.8-12.8h-22.4c-6.4 0-12.8 6.4-12.8 12.8v134.4c0 6.4 6.4 12.8 12.8 12.8zM496 400H48V80c0-8.84-7.16-16-16-16H16C7.16 64 0 71.16 0 80v336c0 17.67 14.33 32 32 32h464c8.84 0 16-7.16 16-16v-16c0-8.84-7.16-16-16-16zm-387.2-48h22.4c6.4 0 12.8-6.4 12.8-12.8v-70.4c0-6.4-6.4-12.8-12.8-12.8h-22.4c-6.4 0-12.8 6.4-12.8 12.8v70.4c0 6.4 6.4 12.8 12.8 12.8z\" class=\"\"><\/path><\/svg><\/i> <img loading=\"lazy\" decoding=\"async\" width=\"16\" height=\"16\" alt=\"Loading\" src=\"https:\/\/reperes-astro.fr\/%77%70%2d%63%6f%6e%74%65%6e%74\/plugins\/page-views-count\/ajax-loader-2x.gif\" border=0 \/><\/p><div class=\"pvc_clear\"><\/div>","protected":false},"excerpt":{"rendered":"<p>J&rsquo;ai le plaisir de vous retranscrire deux m\u00e9taphores tir\u00e9es du livre \u00ab\u00a0le monde selon Etienne Klein\u00a0\u00bb. Tir\u00e9es de la chronique du&#46;&#46;&#46;<\/p>\n<div class=\"pvc_clear\"><\/div>\n<p id=\"pvc_stats_2088\" class=\"pvc_stats all  \" data-element-id=\"2088\" style=\"\"><i class=\"pvc-stats-icon medium\" aria-hidden=\"true\"><svg aria-hidden=\"true\" focusable=\"false\" data-prefix=\"far\" data-icon=\"chart-bar\" role=\"img\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewBox=\"0 0 512 512\" class=\"svg-inline--fa fa-chart-bar fa-w-16 fa-2x\"><path fill=\"currentColor\" d=\"M396.8 352h22.4c6.4 0 12.8-6.4 12.8-12.8V108.8c0-6.4-6.4-12.8-12.8-12.8h-22.4c-6.4 0-12.8 6.4-12.8 12.8v230.4c0 6.4 6.4 12.8 12.8 12.8zm-192 0h22.4c6.4 0 12.8-6.4 12.8-12.8V140.8c0-6.4-6.4-12.8-12.8-12.8h-22.4c-6.4 0-12.8 6.4-12.8 12.8v198.4c0 6.4 6.4 12.8 12.8 12.8zm96 0h22.4c6.4 0 12.8-6.4 12.8-12.8V204.8c0-6.4-6.4-12.8-12.8-12.8h-22.4c-6.4 0-12.8 6.4-12.8 12.8v134.4c0 6.4 6.4 12.8 12.8 12.8zM496 400H48V80c0-8.84-7.16-16-16-16H16C7.16 64 0 71.16 0 80v336c0 17.67 14.33 32 32 32h464c8.84 0 16-7.16 16-16v-16c0-8.84-7.16-16-16-16zm-387.2-48h22.4c6.4 0 12.8-6.4 12.8-12.8v-70.4c0-6.4-6.4-12.8-12.8-12.8h-22.4c-6.4 0-12.8 6.4-12.8 12.8v70.4c0 6.4 6.4 12.8 12.8 12.8z\" class=\"\"><\/path><\/svg><\/i> <img loading=\"lazy\" decoding=\"async\" width=\"16\" height=\"16\" alt=\"Loading\" src=\"https:\/\/reperes-astro.fr\/%77%70%2d%63%6f%6e%74%65%6e%74\/plugins\/page-views-count\/ajax-loader-2x.gif\" border=0 \/><\/p>\n<div class=\"pvc_clear\"><\/div>\n","protected":false},"author":2,"featured_media":2093,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[105,102,5],"tags":[],"class_list":["post-2088","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-archives-reperes-astro-2014","category-archives-reperes-astro","category-documentation"],"yoast_head":"<title>MERCI monsieur KLEIN pour ces deux m\u00e9taphores - Rep\u00e8res Astro<\/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:\/\/reperes-astro.fr\/merci-monsieur-klein-pour-ces-deux-metaphores\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"MERCI monsieur KLEIN pour ces deux m\u00e9taphores - Rep\u00e8res Astro\" \/>\n<meta property=\"og:description\" content=\"J&rsquo;ai le plaisir de vous retranscrire deux m\u00e9taphores tir\u00e9es du livre \u00ab\u00a0le monde selon Etienne Klein\u00a0\u00bb. 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