{"id":136526,"date":"2023-08-02T08:12:19","date_gmt":"2023-08-02T08:12:19","guid":{"rendered":"https:\/\/raed.academy\/?p=136526"},"modified":"2023-08-25T09:37:25","modified_gmt":"2023-08-25T09:37:25","slug":"escudrinyant-als-origens-de-lunivers","status":"publish","type":"post","link":"https:\/\/raed.academy\/ca\/escudrinyant-als-origens-de-lunivers\/","title":{"rendered":"Escudrinyant als or\u00edgens de l&#8217;univers"},"content":{"rendered":"<div id=\"attachment_46952\" style=\"width: 264px\" class=\"wp-caption alignright\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-46952\" class=\"wp-image-46952\" src=\"https:\/\/raed.academy\/wp-content\/uploads\/2018\/06\/Barry-Clark-Barish-CCBY2.0.jpg\" alt=\"Barry Clark Barish\" width=\"254\" height=\"318\" \/><p id=\"caption-attachment-46952\" class=\"wp-caption-text\">Dr. Barry Clark Barish<\/p><\/div>\n<p><a href=\"https:\/\/raed.academy\/ca\/academics\/dr-barry-clark-barish\/\" target=\"_blank\" rel=\"noopener\"><em><strong>Barry Barish<\/strong><\/em><\/a>, premi Nobel de F\u00edsica el 2017,\u00a0professor em\u00e8rit de f\u00edsica de l&#8217;<strong>Institut de Tecnologia de Calif\u00f2rnia<\/strong> i acad\u00e8mic d&#8217;honor de la <strong>Reial Acad\u00e8mia Europea de Doctors-Barcelona 1914<\/strong> (RAED), protagonitza una \u00e0mplia entrevista publicada el 5 de juliol passat al suplement <strong>&#8220;Papel&#8221;<\/strong> del diari<strong> &#8220;El Mundo&#8221;<\/strong> on reflexiona sobre els l\u00edmits de la ci\u00e8ncia i sobre les portes de coneixement de l&#8217;univers que deixa el seu descobriment de les ones gravitacionals que va mer\u00e8ixer el Nobel. Barish ha estat un dels membres del jurat dels <strong>Premis Rei Jaume I<\/strong> que atorga la <strong>Generalitat<\/strong> valenciana.<\/p>\n<p>L&#8217;acad\u00e8mic explica com va aconseguir detectar aquestes ones de l&#8217;exist\u00e8ncia de les quals ja havia advertit <strong>Albert Einstein<\/strong>. &#8220;Una vegada es va provar la teoria d&#8217;Einstein, detectar les ones gravitacionals es va convertir en un problema experimental. S\u00f3n indetectables amb les regles modernes. Per tant, calia trencar la regla i trobar la manera com la natura genera ones gravitacionals i que nosaltres puguem detectar. Vam tenir molt\u00edssima sort perqu\u00e8 vam trobar la font principal: una col\u00b7lisi\u00f3 de forats negres fa 1.300 milions d&#8217;anys. Mai no s&#8217;havia vist ni calculat, per\u00f2 significava que el fenomen havia d&#8217;existir. Des d&#8217;aleshores, el senyal ha estat arribant a la Terra, i ha estat ara quan ten\u00edem alguna cosa que el podia detectar. El seu efecte \u00e9s incre\u00efblement petit, i per aix\u00f2 la dificultat. Port\u00e0vem 20 anys construint i perfeccionant l&#8217;aparell, per\u00f2 sense veure res. El setembre del 2015 ho vam encendre i r\u00e0pidament vam veure l&#8217;efecte del forat negre. Un dels meus col\u00b7legues va tenir un moment eureka. El meu va ser m\u00e9s de p\u00e0nic. Era un detector nou i em preguntava si no hav\u00edem fet alguna cosa malament&#8221;, explica el cient\u00edfic.<\/p>\n<p>Barish considera que gr\u00e0cies a la detecci\u00f3 d&#8217;aquestes ones gravitacionals ser\u00e0 possible con\u00e8ixer els primers instants de l&#8217;univers despr\u00e9s del Big Bang. &#8220;Tot el que sabem de l&#8217;univers incipient ve de les ones electromagn\u00e8tiques. Ara b\u00e9, les primeres observacions que tenim amb aquestes ones s\u00f3n de 400.000 anys despr\u00e9s del Big Bang. Com que les ones gravitacionals no s&#8217;absorbeixen, si mesur\u00e9ssim les que es van originar en aquests primers instants, podr\u00edem viatjar al principi de l&#8217;univers. No sabem com, per\u00f2 ho farem. Es trigar\u00e0 m\u00e9s del que em queda de vida. Per\u00f2 sabem que \u00e9s possible. Segurament amb un altre tipus de tecnologia&#8221;, assenyala.<\/p>\n<p>El Nobel conclou l&#8217;entrevista amb una reflexi\u00f3 sobre els perills de la ci\u00e8ncia davant dels aven\u00e7os com la intel\u00b7lig\u00e8ncia artificial. &#8220;La por \u00e9s raonable, hi ha un perill, per\u00f2 aix\u00f2 no significa que no h\u00e0gim d&#8217;avan\u00e7ar. L&#8217;exemple m\u00e9s dram\u00e0tic \u00e9s la bomba at\u00f2mica: els cient\u00edfics la van crear i la societat no la va saber gestionar. No hi ha garanties que sapiguem gestionar els aven\u00e7os cient\u00edfics. Tot i aix\u00ed cal adonar-se que la intel\u00b7lig\u00e8ncia artificial t\u00e9 una limitaci\u00f3: pot jugar als escacs millor que nosaltres i potser escriu un article, per\u00f2 no pot raonar, nosaltres raonem per prendre decisions, i aix\u00f2 no ho pot fer la intel\u00b7lig\u00e8ncia artificial. \u00c9s una eina que pot fer tasques. \u00c9s clar que es pot fer servir per al mal, per\u00f2 no vol dir que ens reempla\u00e7ar\u00e0&#8221;, afirma.<\/p>\n<p>Un any despr\u00e9s de ser reconegut per l&#8217;<strong>Acad\u00e8mia Sueca<\/strong>, Barish va oferir al <strong>CosmoCaixa<\/strong> de l&#8217;<strong>Obra Social La Caixa<\/strong> la confer\u00e8ncia <strong>&#8220;Ones gravitacionals: d&#8217;Einstein a una nova ci\u00e8ncia&#8221;<\/strong>, amb la col\u00b7laboraci\u00f3 de la RAED. Barish va ser un dels grans art\u00edfexs de la demostraci\u00f3 emp\u00edrica de l&#8217;exist\u00e8ncia d&#8217;aquestes ones, que ja va predir Einstein el 1916. Gaireb\u00e9 un segle despr\u00e9s, el 14 de setembre del 2015, els dos interfer\u00f2metres de l&#8217;<strong>Observatori d&#8217;Ones Gravitacionals per Interferometria L\u00e0ser<\/strong>, que dirigia l&#8217;acad\u00e8mic d&#8217;honor de la RAED, van captar per primer cop aquestes ones gravitacionals procedents de la col\u00b7lisi\u00f3 de dos forats negres. I a l&#8217;agost del 2017, altres generades per la fusi\u00f3 de dues estrelles de neutrons. Barish va rebre tamb\u00e9 el premi <strong>Princesa d&#8217;Ast\u00faries 2017<\/strong> pel seu treball sobre les ones gravitacionals juntament amb <strong>Kip Thorne<\/strong> i <strong>Rainer Weiss<\/strong>, amb qui tamb\u00e9 va rebre el Nobel.<\/p>\n<h2><a href=\"https:\/\/www.elmundo.es\/papel\/el-mundo-que-viene\/2023\/07\/05\/649eb10dfc6c83bd1b8b458d.html\" target=\"_blank\" rel=\"noopener\"><strong>Llegiu l&#8217;entrevista<\/strong><\/a><\/h2>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-124839\" src=\"https:\/\/raed.academy\/wp-content\/uploads\/2022\/11\/shutterstock_Universo-Cosmos-galaxias-la-Tierra-desde-el-espacio-2.38.webp\" alt=\"\" width=\"1000\" height=\"420\" srcset=\"https:\/\/raed.academy\/wp-content\/uploads\/2022\/11\/shutterstock_Universo-Cosmos-galaxias-la-Tierra-desde-el-espacio-2.38.webp 1000w, https:\/\/raed.academy\/wp-content\/uploads\/2022\/11\/shutterstock_Universo-Cosmos-galaxias-la-Tierra-desde-el-espacio-2.38-768x323.webp 768w\" sizes=\"(max-width: 1000px) 100vw, 1000px\" \/><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Barry Barish reflexiona sobre els l\u00edmits de la ci\u00e8ncia i sobre les portes del coneixement de l&#8217;univers que deixa el descobriment de les ones gravitacionals que li van valer el Nobel<\/p>\n","protected":false},"author":12,"featured_media":124840,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_et_pb_use_builder":"","_et_pb_old_content":"","_et_gb_content_width":"","footnotes":""},"categories":[313,298],"tags":[],"class_list":["post-136526","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-cosmologia-ca","category-fisica-ca","et-has-post-format-content","et_post_format-et-post-format-standard"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - 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