{"id":1033,"date":"2011-10-12T15:01:00","date_gmt":"2011-10-12T18:01:00","guid":{"rendered":"http:\/\/scienceblogs.com.br\/hypercubic\/2011\/10\/um-empurraozinho-gravitacional\/"},"modified":"2011-10-12T15:01:00","modified_gmt":"2011-10-12T18:01:00","slug":"um-empurraozinho-gravitacional","status":"publish","type":"post","link":"https:\/\/www.blogs.unicamp.br\/hypercubic\/2011\/10\/um-empurraozinho-gravitacional\/","title":{"rendered":">Um empurr\u00e3ozinho gravitacional"},"content":{"rendered":"

><\/p>\n

\n\n\n\n\n
<\/a><\/td>\n<\/tr>\n
Modelo de varia\u00e7\u00e3o gravitacional na superf\u00edcie da Terra. Quanto maior (e mais vermelha)
a deforma\u00e7\u00e3o, maior a gravidade.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

<\/div>\n

\u201cGravidade \u2014 \u00e9 a Lei!\u201d Isso \u00e9 o que Beakman sempre nos lembrava com os tombos que aconteciam em seu programa. Aparentemente, por\u00e9m, os cientistas que descobriram supostos neutrinos superlum\u00ednicos (mais r\u00e1pidos que a luz) n\u00e3o se lembraram dessa for\u00e7a fundamental. Segundo Alex Knapp conta em seu blog na <\/a>Forbes<\/a> <\/i>(!?)<\/span>, um novo artigo<\/a> escrito por Carlo Contaldi, do Imperial College de Londres, contesta os c\u00e1lculos que a equipe do OPERA apresentou como evid\u00eancia para a descoberta de neutrinos que quebraram a barreira da luz.<\/p>\n

Em qualquer experimento bem conduzido, rel\u00f3gios sincronizados s\u00e3o essenciais para uma marca\u00e7\u00e3o precisa do tempo. Se esses rel\u00f3gios n\u00e3o estiverem bem ajustados, mas forem usados para c\u00e1lculos de velocidade, o resultado pode ser errado. O problema b\u00e1sico com os dados do OPERA, argumenta Contaldi, \u00e9 que os rel\u00f3gios usados para medir a velocidade dos neutrinos n\u00e3o estavam adequadamente sincronizados.<\/p>\n

Os rel\u00f3gios usados no experimento eram sincronizados via GPS. No entanto, segundo o cr\u00edtico italiano, isso n\u00e3o \u00e9 suficientemente preciso. Pode haver discrepancias porque a gravidade em diferentes lugares da superf\u00edcie da Terra n\u00e3o \u00e9 constante. A gravidade no local onde fica o CERN \u2014 na fronteira franco-su\u00ed\u00e7a e n\u00e3o muito longe dos Alpes \u2014 e de onde os neutrinos sa\u00edram \u00e9 ligeiramente maior do que a gravidade de onde fica o detector OPERA \u2014 no centro da It\u00e1lia. Consequentemente, o tempo poderia parecer passar mais lentamente no CERN para quem estivesse no OPERA. Desconsiderar essa diferen\u00e7a, segundo Contaldi, significa que \u201ca medi\u00e7\u00e3o resultante da velocidade do neutrino diferente de c<\/i> n\u00e3o \u00e9 apenas pouco surpreendente, mas deveria ser esperada <\/i>nesse contexto.\u201d<\/p>\n

Evidentemente, os cientistas do OPERA ainda n\u00e3o se deram por vencidos e dizem que Contaldi n\u00e3o descreve exatamente os meios pelos quais o grupo sincronizou seus instrumentos. Mas o OPERA aceitou o desafio e pretende revisar seu artigo para esclarecer este ponto. \u00c9 uma briga das boas. Como toda boa ci\u00eancia.<\/p><\/div>\n

(via discoverynews <\/a>via tumblr<\/a>)<\/p>\n","protected":false},"excerpt":{"rendered":"

> Modelo de varia\u00e7\u00e3o gravitacional na superf\u00edcie da Terra. Quanto maior (e mais vermelha) a deforma\u00e7\u00e3o, maior a gravidade. \u201cGravidade \u2014 \u00e9 a Lei!\u201d Isso \u00e9 o que Beakman sempre nos lembrava com os tombos que aconteciam em seu programa. Aparentemente, por\u00e9m, os cientistas que descobriram supostos neutrinos superlum\u00ednicos (mais r\u00e1pidos que a luz) n\u00e3o […]<\/p>\n","protected":false},"author":486,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_eb_attr":"","_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"material-hide-sections":[],"pgc_sgb_lightbox_settings":"","_vp_format_video_url":"","_vp_image_focal_point":[],"footnotes":""},"categories":[53,86,131],"tags":[],"class_list":["post-1033","post","type-post","status-publish","format-standard","hentry","category-ciencia","category-divulgacao-cientifica","category-fisica"],"yoast_head":"\n>Um empurr\u00e3ozinho gravitacional - hypercubic<\/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:\/\/www.blogs.unicamp.br\/hypercubic\/2011\/10\/um-empurraozinho-gravitacional\/\" \/>\n<meta name=\"twitter:label1\" content=\"Escrito por\" \/>\n\t<meta name=\"twitter:data1\" content=\"Renato Pincelli\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. tempo de leitura\" \/>\n\t<meta name=\"twitter:data2\" content=\"2 minutos\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/www.blogs.unicamp.br\\\/hypercubic\\\/2011\\\/10\\\/um-empurraozinho-gravitacional\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.blogs.unicamp.br\\\/hypercubic\\\/2011\\\/10\\\/um-empurraozinho-gravitacional\\\/\"},\"author\":{\"name\":\"Renato Pincelli\",\"@id\":\"https:\\\/\\\/www.blogs.unicamp.br\\\/hypercubic\\\/#\\\/schema\\\/person\\\/c7be1e2811d061a75d3b4f4960eb53bd\"},\"headline\":\">Um empurr\u00e3ozinho gravitacional\",\"datePublished\":\"2011-10-12T18:01:00+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/www.blogs.unicamp.br\\\/hypercubic\\\/2011\\\/10\\\/um-empurraozinho-gravitacional\\\/\"},\"wordCount\":366,\"commentCount\":0,\"publisher\":{\"@id\":\"https:\\\/\\\/www.blogs.unicamp.br\\\/hypercubic\\\/#organization\"},\"image\":{\"@id\":\"https:\\\/\\\/www.blogs.unicamp.br\\\/hypercubic\\\/2011\\\/10\\\/um-empurraozinho-gravitacional\\\/#primaryimage\"},\"thumbnailUrl\":\"http:\\\/\\\/scienceblogs.com.br\\\/hypercubic\\\/files\\\/2012\\\/11\\\/tumblr_lswyyvTSN91qbh26io1_500.jpg\",\"articleSection\":[\"ci\u00eancia\",\"divulga\u00e7\u00e3o cient\u00edfica\",\"f\u00edsica\"],\"inLanguage\":\"pt-BR\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\\\/\\\/www.blogs.unicamp.br\\\/hypercubic\\\/2011\\\/10\\\/um-empurraozinho-gravitacional\\\/#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/www.blogs.unicamp.br\\\/hypercubic\\\/2011\\\/10\\\/um-empurraozinho-gravitacional\\\/\",\"url\":\"https:\\\/\\\/www.blogs.unicamp.br\\\/hypercubic\\\/2011\\\/10\\\/um-empurraozinho-gravitacional\\\/\",\"name\":\">Um empurr\u00e3ozinho gravitacional - 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