{"id":100963,"date":"2025-12-09T18:49:24","date_gmt":"2025-12-09T16:49:24","guid":{"rendered":"https:\/\/www.lovendal.ro\/wp52\/?p=100963"},"modified":"2025-12-09T18:49:24","modified_gmt":"2025-12-09T16:49:24","slug":"cat-va-mai-exista-aceasta-lume-o-noua-cercetare-sustine-ca-ea-se-va-sfarsi-mai-devreme-decat-am-crezut","status":"publish","type":"post","link":"https:\/\/www.lovendal.ro\/wp52\/cat-va-mai-exista-aceasta-lume-o-noua-cercetare-sustine-ca-ea-se-va-sfarsi-mai-devreme-decat-am-crezut\/","title":{"rendered":"C\u00e2t va mai exista aceast\u0103 lume? O nou\u0103 cercetare sus\u0163ine c\u0103 ea se va sf\u00e2r\u015fi mai devreme dec\u00e2t am crezut"},"content":{"rendered":"<p><a href=\"https:\/\/www.lovendal.ro\/wp52\/wp-content\/uploads\/2025\/12\/sfarsitul-lumii.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"alignleft size-full wp-image-100964\" src=\"https:\/\/www.lovendal.ro\/wp52\/wp-content\/uploads\/2025\/12\/sfarsitul-lumii.jpg\" alt=\"\" width=\"369\" height=\"234\" srcset=\"https:\/\/www.lovendal.ro\/wp52\/wp-content\/uploads\/2025\/12\/sfarsitul-lumii.jpg 369w, https:\/\/www.lovendal.ro\/wp52\/wp-content\/uploads\/2025\/12\/sfarsitul-lumii-300x190.jpg 300w\" sizes=\"auto, (max-width: 369px) 100vw, 369px\" \/><\/a>\u00cen viitorul \u00eendep\u0103rtat, mult dup\u0103 ce stelele vor \u00eenceta s\u0103 str\u0103luceasc\u0103, Universul nu va con\u021bine nimic altceva dec\u00e2t r\u0103m\u0103\u0219i\u021bele lor: g\u0103uri negre, stele neutronice, pitice albe \u0219i gaze rare. \u00centrebarea va fi: oare vreo parte din aceast\u0103 materie dureaz\u0103 pentru totdeauna sau Universul \u0219terge chiar \u0219i cele mai rezistente obiecte ale sale? Un nou studiu teoretic ia aceast\u0103 \u00eentrebare \u00een serios. Se \u00eentreab\u0103 ce se \u00eent\u00e2mpl\u0103 atunci c\u00e2nd gravita\u021bia curbeaz\u0103 spa\u021biu-timpul, a\u0219a cum se \u00eent\u00e2mpl\u0103 \u00een relativitatea general\u0103, \u0219i c\u00e2nd c\u00e2mpurile cuantice sunt urm\u0103rite pe perioade foarte lungi. Efecte minuscule care ast\u0103zi par inofensive ar putea decide \u00een lini\u0219te soarta a tot ceea ce este alc\u0103tuit din materie.<\/p>\n<p>Studiul a fost realizat de trei cercet\u0103tori de la Universitatea Radboud din Nijmegen, Olanda: expertul \u00een g\u0103uri negre <strong>Heino Falcke<\/strong>, fizicianul cuantic <strong>Michael Wondrak<\/strong> \u0219i matematicianul <strong>Walter van Suijlekom<\/strong>. Ei au sus\u021binut c\u0103 g\u0103urile negre, dar \u0219i stelele dense precum stelele neutronice, pot pierde mas\u0103 printr-un proces de evaporare de tip Hawking, iar mul\u021bi oameni au \u00eentrebat c\u00e2t ar dura un astfel de proces.<\/p>\n<p>Pentru a le urm\u0103ri munca, este util s\u0103 ne amintim ideea de baz\u0103 din spatele <strong>radia\u021biei Hawking<\/strong>. \u00cen aceast\u0103 predic\u021bie, efectele cuantice din apropierea orizontului evenimentelor unei g\u0103uri negre o determin\u0103 s\u0103 emit\u0103 un flux slab de particule \u0219i s\u0103 piard\u0103 treptat mas\u0103, astfel \u00eenc\u00e2t nici m\u0103car o gaur\u0103 neagr\u0103 nu este permanent\u0103. Studiul se \u00eentreab\u0103 ce se \u00eent\u00e2mpl\u0103 atunci c\u00e2nd nu exist\u0103 deloc un orizont al evenimentelor. O stea neutronic\u0103 sau o stea pitic\u0103 alb\u0103 poate \u00eencadra o cantitate imens\u0103 de mas\u0103 \u00eentr-un volum mic \u0219i poate curba puternic spa\u021biu-timpul, f\u0103r\u0103 a deveni totu\u0219i o gaur\u0103 neagr\u0103. Autorii au investigat dac\u0103 aceast\u0103 curbur\u0103, \u00een sine, poate crea particule \u0219i absorbi energie dintr-un astfel de obiect. Ei au tratat aceste r\u0103m\u0103\u0219i\u021be compacte ca puncte finale ale evolu\u021biei stelare, concentr\u00e2ndu-se asupra modului \u00een care se comport\u0103 c\u00e2mpurile cuantice \u00een jurul lor atunci c\u00e2nd alte complica\u021bii astrofizice au disp\u0103rut.<\/p>\n<p>Calculul vizeaz\u0103 durata de via\u021b\u0103 final\u0103 a unor astfel de corpuri dense, atunci c\u00e2nd doar gravita\u021bia \u0219i fizica cuantic\u0103 mai conteaz\u0103. Autorii au folosit teoria cuantic\u0103 a c\u00e2mpurilor \u00een spa\u021biu-timp curbat, un cadru care p\u0103streaz\u0103 c\u00e2mpurile cuantice, dar permite spa\u021biu-timpului s\u0103 se curbeze, a\u0219a cum relativitatea general\u0103 prezice obiecte apropiate de dense. \u00cen modelul lor, o stea compact\u0103 este o bil\u0103 sferic\u0103, nerotativ\u0103, cu densitate constant\u0103, \u00eenconjurat\u0103 de vid. Stelele neutronice reale se rotesc, au interioare complexe \u0219i pot purta c\u00e2mpuri magnetice intense, \u00eens\u0103 aceast\u0103 stea idealizat\u0103 p\u0103streaz\u0103 caracteristica cheie a curburii puternice \u00een interiorul \u0219i \u00een jurul unui corp dens.<\/p>\n<p>\u00cen cadrul acestei configura\u021bii, cei trei speciali\u015fti au calculat c\u00e2t de des spa\u021biu-timpul curbat din jurul unui astfel de obiect creeaz\u0103 perechi de particule f\u0103r\u0103 mas\u0103 din vid. O curbur\u0103 puternic\u0103 poate separa perechi de particule virtuale \u00eenainte de a se anihila, transform\u00e2ndu-le \u00een particule reale, de energie redus\u0103, cum ar fi fotonii sau gravitonii, care transport\u0103 energia. Perechile create \u00een afara stelei pot trimite una sau ambele particule la infinit sau le pot curba \u00eenapoi spre obiect, \u00een timp ce perechile create \u00een interior sunt absorbite \u0219i adaug\u0103 c\u0103ldur\u0103 stelei. Dintr-un punct de vedere exterior, aceasta duce la dou\u0103 surse de energie emis\u0103: unele particule evadeaz\u0103 direct \u00een spa\u021biu, iar altele cad mai \u00eent\u00e2i \u00eenapoi, \u00eenc\u0103lzesc u\u0219or steaua \u0219i apoi reapar sub form\u0103 de radia\u021bie termic\u0103 de la suprafa\u021ba sa.<\/p>\n<p>Pentru o stea cu suprafa\u021b\u0103, ambele canale func\u021bioneaz\u0103. Dar g\u0103urile negre nu au suprafa\u021b\u0103; ele reabsorb o parte din propria radia\u021bie, ceea ce inhib\u0103 procesul. O m\u0103rime central\u0103 \u00een analiza lor este compactitatea, care compar\u0103 raza stelei cu raza pe care ar avea-o o gaur\u0103 neagr\u0103 cu aceea\u0219i mas\u0103. Pe m\u0103sur\u0103 ce un obiect devine mai compact \u0219i raza sa se apropie de valoarea g\u0103urii negre, spa\u021biu-timpul din jurul s\u0103u se curbeaz\u0103 mai puternic, iar puterea cuantic\u0103 pe care o emite cre\u0219te. Spectrul acestei emisii se deplaseaz\u0103 spre frecven\u021be mai \u00eenalte, ca \u0219i cum obiectul ar avea o temperatur\u0103 mai ridicat\u0103.<\/p>\n<p>Cercet\u0103torii au luat \u00een considerare deplasarea gravita\u021bional\u0103 spre ro\u0219u, pentru a calcula ce ar m\u0103sura un astronom aflat la distan\u021b\u0103. Apoi, s-a estimat un timp de evaporare, lu\u00e2nd energia total\u0103 a obiectului, folosind E = mc\u00b2 , \u0219i \u00eemp\u0103r\u021bind la rata de pierdere de energie. Astfel, durata de via\u021b\u0103 depinde \u00een principal de densitatea medie, dec\u00e2t de mas\u0103 \u0219i raz\u0103. \u00centr-o form\u0103 simplificat\u0103, obiectele mai dense \u00ee\u0219i pierd masa mai repede prin acest mecanism.<\/p>\n<p>Stelele neutronice ajung s\u0103 aib\u0103 durate de via\u021b\u0103 comparabile cu cele ale g\u0103urilor negre cu mas\u0103 stelar\u0103. Piticele albe se evapor\u0103 mai lent deoarece sunt mai pu\u021bin dense, iar g\u0103urile negre supermasive supravie\u021buiesc cel mai mult timp deoarece densit\u0103\u021bile lor medii sunt sc\u0103zute.<\/p>\n<p>Toate lucrurile trebuie s\u0103 se sf\u00e2r\u0219easc\u0103, chiar \u0219i Universul. \u00cen cele din urm\u0103, chiar \u0219i cele mai &#8222;permanente&#8221; p\u0103r\u021bi ale Universului sunt temporare. G\u0103urile negre, stelele neutronice, piticele albe, planetele \u0219i norii sub\u021biri de gaz pot p\u0103rea \u00eenghe\u021ba\u021bi \u0219i neschimba\u021bi pe sc\u0103rile de timp umane sau chiar galactice, dar c\u00e2mpurile cuantice din spa\u021biu-timp curbat continu\u0103 s\u0103 le erodeze \u00een lini\u0219te. \u00cen cele din urm\u0103, Universul devine un loc \u00een care gravita\u021bia \u0219i fizica cuantic\u0103 transform\u0103 \u00eencet tot ce are mas\u0103 \u00een fluxuri slabe de particule.<\/p>\n<p><strong>Sursa:<\/strong> studiul \u015ftiin\u0163ific <a href=\"https:\/\/arxiv.org\/html\/2410.14734v2\" target=\"_blank\" rel=\"noopener\"><strong>&#8222;An upper limit to the lifetime of stellar remnants from gravitational pair production&#8221; \/ arxiv.org<\/strong><\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u00cen viitorul \u00eendep\u0103rtat, mult dup\u0103 ce stelele vor \u00eenceta s\u0103 str\u0103luceasc\u0103, Universul nu va con\u021bine nimic altceva dec\u00e2t r\u0103m\u0103\u0219i\u021bele lor: g\u0103uri negre, stele neutronice, pitice albe \u0219i gaze rare. \u00centrebarea va fi: oare vreo parte din aceast\u0103 materie dureaz\u0103 pentru &#8230; <\/p>\n<p class=\"read-more-container\"><a title=\"C\u00e2t va mai exista aceast\u0103 lume? O nou\u0103 cercetare sus\u0163ine c\u0103 ea se va sf\u00e2r\u015fi mai devreme dec\u00e2t am crezut\" class=\"read-more button\" href=\"https:\/\/www.lovendal.ro\/wp52\/cat-va-mai-exista-aceasta-lume-o-noua-cercetare-sustine-ca-ea-se-va-sfarsi-mai-devreme-decat-am-crezut\/#more-100963\" aria-label=\"Cite\u0219te mai multe despre C\u00e2t va mai exista aceast\u0103 lume? O nou\u0103 cercetare sus\u0163ine c\u0103 ea se va sf\u00e2r\u015fi mai devreme dec\u00e2t am crezut\">Cititi mai multe<\/a><\/p>\n","protected":false},"author":1,"featured_media":100964,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[11039],"tags":[3063,102,2524,2048,596,1367,679,429,6790,299,13121,2501,3175,18910,2358,789,1087,2250],"class_list":["post-100963","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-astronomie","tag-astronom","tag-astronomie","tag-fizica-cuantica","tag-fizician","tag-gaura-neagra","tag-gravitatie","tag-matematician","tag-olanda","tag-particule","tag-planete","tag-radiatia-hawking","tag-spatiu","tag-stele","tag-stele-pitice","tag-temperatura","tag-timp","tag-univers","tag-universitate","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>C\u00e2t va mai exista aceast\u0103 lume? 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