{"id":44473,"date":"2016-06-03T17:30:16","date_gmt":"2016-06-03T14:30:16","guid":{"rendered":"http:\/\/www.lovendal.ro\/wp52\/?p=44473"},"modified":"2016-06-03T17:32:00","modified_gmt":"2016-06-03T14:32:00","slug":"un-nou-studiu-socant-al-fizicienilor-arata-ca-gaurile-negre-asa-cum-noi-ni-le-am-imaginat-pana-acum-sunt-doar-o-holograma-gaura-neagra-ar-putea-fi-una-bidimensionala-si-nu-tridimensionala","status":"publish","type":"post","link":"https:\/\/www.lovendal.ro\/wp52\/un-nou-studiu-socant-al-fizicienilor-arata-ca-gaurile-negre-asa-cum-noi-ni-le-am-imaginat-pana-acum-sunt-doar-o-holograma-gaura-neagra-ar-putea-fi-una-bidimensionala-si-nu-tridimensionala\/","title":{"rendered":"Un nou studiu \u015focant al fizicienilor arat\u0103 c\u0103 g\u0103urile negre, a\u015fa cum noi ni le-am imaginat p\u00e2n\u0103 acum, sunt doar o hologram\u0103! Gaura neagr\u0103 ar putea fi una bidimensional\u0103, \u015fi nu tridimensional\u0103&#8230;"},"content":{"rendered":"<p><a href=\"https:\/\/www.lovendal.ro\/wp52\/un-nou-studiu-socant-al-fizicienilor-arata-ca-gaurile-negre-asa-cum-noi-ni-le-am-imaginat-pana-acum-sunt-doar-o-holograma-gaura-neagra-ar-putea-fi-una-bidimensionala-si-nu-tridimensionala\/gaura-neagra-6\/\" rel=\"attachment wp-att-44474\"><img loading=\"lazy\" decoding=\"async\" class=\"alignleft size-full wp-image-44474\" src=\"https:\/\/www.lovendal.ro\/wp52\/wp-content\/uploads\/2016\/06\/gaura-neagra.jpg\" alt=\"gaura neagra\" width=\"333\" height=\"231\" srcset=\"https:\/\/www.lovendal.ro\/wp52\/wp-content\/uploads\/2016\/06\/gaura-neagra.jpg 333w, https:\/\/www.lovendal.ro\/wp52\/wp-content\/uploads\/2016\/06\/gaura-neagra-300x208.jpg 300w, https:\/\/www.lovendal.ro\/wp52\/wp-content\/uploads\/2016\/06\/gaura-neagra-20x14.jpg 20w\" sizes=\"auto, (max-width: 333px) 100vw, 333px\" \/><\/a>Lucrurile despre care \u015ftim cu adev\u0103rat cel mai pu\u0163in \u00een acest Univers sunt g\u0103urile negre. Noi nu le putem vedea pentru c\u0103 nici m\u0103car lumina nu poate sc\u0103pa atrac\u0163iei lor gravita\u021bionale; nu avem nicio idee despre ele, adic\u0103 din ce sunt f\u0103cute, iar tot ce ajunge \u00eentr-o gaur\u0103 neagr\u0103, e mort.<\/p>\n<p>Fizicienii nici m\u0103car nu se pot pune de acord dac\u0103 g\u0103urile negre sunt ni\u015fte &#8222;mon\u015ftri&#8221; masivi, tridimensionali sau doar suprafe\u021be bidimensionale, care sunt proiectate \u00een 3D, la fel ca o hologram\u0103. Dar sunt g\u0103urile negre doar ni\u015fte holograme? Un nou studiu arat\u0103 faptul c\u0103 aceste enigme gigantice ale Universului nu sunt altceva dec\u00e2t&#8230; iluzii optice!<\/p>\n<p>Fizicianul Leonard Susskind a demonstrat \u00een anii 1990 c\u0103, matematic vorbind, Universul are nevoie de doar dou\u0103 dimensiuni &#8211; nu trei &#8211; pentru ca legile fizicii \u0219i gravita\u0163ia s\u0103 func\u0163ioneze a\u0219a cum ar trebui. Pentru noi, \u00eens\u0103, totul apare ca o imagine tridimensional\u0103 a dou\u0103 procese dimensionale proiectate pe un orizont cosmic imens. Acest lucru ar putea p\u0103rea ca un paradox, dar ar putea rezolva, de fapt, unele contradic\u021bii mari \u00eentre teoria relativit\u0103\u021bii \u0219i a mecanicii cuantice a lui Einstein, adic\u0103 nimic nu poate sc\u0103pa de o gaur\u0103 neagr\u0103, dar materia nu poate fi distrus\u0103 complet.<\/p>\n<p>Fizicienii au sugerat c\u0103 motivul pentru care nu ne putem da seama ce se \u00eent\u00e2mpl\u0103 odat\u0103 ce se trece de orizontul evenimentului \u00eentr-o gaur\u0103 neagr\u0103 se datoreaz\u0103 faptului c\u0103 nu exist\u0103 niciun &#8222;interior&#8221;. O echip\u0103 condus\u0103 de fizicianul Daniele Pranzetti de la Institutul Max Planck pentru Fizic\u0103 teoretic\u0103 din Germania a venit acum cu o nou\u0103 estimare pentru cantitatea de entropie prezent\u0103 \u00eentr-o gaur\u0103 neagr\u0103, iar calculele lor sus\u021bin acest scenariu. <em>&#8222;Noi am fost capabili de a utiliza un model mai complet \u00een compara\u021bie cu ceea ce s-a f\u0103cut \u00een trecut \u0219i de a ob\u021bine un rezultat mult mai realist \u0219i robust&#8221;<\/em>, a declarat Pranzetti.<\/p>\n<p>Cercet\u0103torii s-au concentrat asupra entropiei &#8211; o proprietate fizic\u0103 care codific\u0103 modul \u00een care ceva se ordoneaz\u0103. Stephen Hawking a sugerat \u00een trecut c\u0103 entropia unei g\u0103uri negre trebuie s\u0103 fie propor\u021bional\u0103 cu suprafa\u021ba sa, dar nu \u0219i cu volumul s\u0103u, iar aceast\u0103 idee a stimulat posibilitatea ca g\u0103urile negre s\u0103 fie holografice.<\/p>\n<p>Pentru un nou mod de g\u00e2ndire cu privire la aceast\u0103 problem\u0103, Pranzetti si colegii s\u0103i au folosit o abordare teoretic\u0103 numit\u0103 &#8222;gravita\u0163ia buclei cuantice&#8221;, pentru a explica un concept cunoscut sub numele de gravita\u0163ie cuantic\u0103. \u00cen fizica teoretic\u0103, gravita\u021bia cuantic\u0103 descrie for\u021ba gravita\u021biei \u00een conformitate cu principiile mecanicii cuantice, spun\u00e2nd c\u0103 \u021bes\u0103tura de spa\u021biu-timp este alc\u0103tuit\u0103 din particule mici cunoscute sub numele de &#8222;cuante&#8221; &#8211; &#8222;atomii&#8221; spa\u021biului-timp. O colec\u0163ie a acestor cuante sunt cunoscute sub numele de &#8222;condensate&#8221;, iar echipa a constatat c\u0103, la fel cum mai mul\u0163i atomi formeaz\u0103 moleculele de ap\u0103, \u015fi o gaur\u0103 neagr\u0103 alc\u0103tuit\u0103 din aceste condensate ar avea toate acelea\u0219i propriet\u0103\u021bi, iar comportamentul lor colectiv \u0219i impactul lor gravita\u021bional ar putea fi determinat prin studierea propriet\u0103\u021bilor a doar unui atom. Asta \u00eenseamn\u0103 c\u0103, de\u015fi noi nu putem vedea sau m\u0103sura ceea ce este dincolo de orizontul unei g\u0103uri negre &#8211; adic\u0103 entropia &#8211; lucrul acesta nu mai conteaz\u0103 cu adev\u0103rat, dac\u0103 toate propriet\u0103\u021bile colective ale tuturor &#8222;atomilor&#8221; pot fi m\u0103surate \u00een doar \u00eentr-un singur atom.<\/p>\n<p>Deci, ce \u00eenseamn\u0103 asta pentru ipoteza g\u0103urii negre holograme? Ei bine, o gaur\u0103 neagr\u0103 este asemenea unui co\u0219 de baschet tridimensional; inelul co\u015fului este orizontul evenimentului, iar plasa este gaura \u00een care toat\u0103 materia cade \u0219i dispare. \u00cempinge\u0163i plasa co\u015fului \u00een sus, \u00een inel, pentru a crea un cerc plat, bidimensional \u015fi apoi imagina\u0163i-v\u0103 c\u0103 tot acest mecanism e f\u0103cut din ap\u0103. Acum, tot ce m\u0103sura\u021bi \u00een inel poate fi aplicat la ceea ce este \u00een plas\u0103.<\/p>\n<p>A\u015fadar, Pranzetti \u0219i echipa sa au acum un model concret pentru a ar\u0103ta c\u0103 natura 3D a g\u0103urilor negre ar putea fi doar o iluzie; toate informa\u021biile dintr-o gaur\u0103 neagr\u0103 ar putea fi, teoretic, con\u021binute pe o suprafa\u021b\u0103 cu dou\u0103 dimensiuni, f\u0103r\u0103 a fi nevoie pentru o &#8222;gaur\u0103&#8221; real\u0103 sau un interior.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Lucrurile despre care \u015ftim cu adev\u0103rat cel mai pu\u0163in \u00een acest Univers sunt g\u0103urile negre. Noi nu le putem vedea pentru c\u0103 nici m\u0103car lumina nu poate sc\u0103pa atrac\u0163iei lor gravita\u021bionale; nu avem nicio idee despre ele, adic\u0103 din ce &#8230; <\/p>\n<p class=\"read-more-container\"><a title=\"Un nou studiu \u015focant al fizicienilor arat\u0103 c\u0103 g\u0103urile negre, a\u015fa cum noi ni le-am imaginat p\u00e2n\u0103 acum, sunt doar o hologram\u0103! Gaura neagr\u0103 ar putea fi una bidimensional\u0103, \u015fi nu tridimensional\u0103&#8230;\" class=\"read-more button\" href=\"https:\/\/www.lovendal.ro\/wp52\/un-nou-studiu-socant-al-fizicienilor-arata-ca-gaurile-negre-asa-cum-noi-ni-le-am-imaginat-pana-acum-sunt-doar-o-holograma-gaura-neagra-ar-putea-fi-una-bidimensionala-si-nu-tridimensionala\/#more-44473\" aria-label=\"Cite\u0219te mai multe despre Un nou studiu \u015focant al fizicienilor arat\u0103 c\u0103 g\u0103urile negre, a\u015fa cum noi ni le-am imaginat p\u00e2n\u0103 acum, sunt doar o hologram\u0103! Gaura neagr\u0103 ar putea fi una bidimensional\u0103, \u015fi nu tridimensional\u0103&#8230;\">Cititi mai multe<\/a><\/p>\n","protected":false},"author":1,"featured_media":44474,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[2833,106],"tags":[601,346,3829,610,10133,348,9786,596,203,1367,4896,952,345,3595,2501,9803,789,1087],"class_list":["post-44473","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-noutati","category-stiinta","tag-apa","tag-atomi","tag-baschet","tag-einstein","tag-entropie","tag-fizica","tag-fizicieni","tag-gaura-neagra","tag-germania","tag-gravitatie","tag-hawking","tag-lumina","tag-materie","tag-molecule","tag-spatiu","tag-stiinta","tag-timp","tag-univers","resize-featured-image"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v23.3 (Yoast SEO v27.4) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Un nou studiu \u015focant al fizicienilor arat\u0103 c\u0103 g\u0103urile negre, a\u015fa cum noi ni le-am imaginat p\u00e2n\u0103 acum, sunt doar o hologram\u0103! 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