{"id":52683,"date":"2017-08-24T18:38:08","date_gmt":"2017-08-24T15:38:08","guid":{"rendered":"http:\/\/www.lovendal.ro\/wp52\/?p=52683"},"modified":"2017-08-24T18:38:08","modified_gmt":"2017-08-24T15:38:08","slug":"este-posibila-calatoria-cu-viteze-mai-mari-decat-cea-luminii-daca-da-putea-calatori-trecut","status":"publish","type":"post","link":"https:\/\/www.lovendal.ro\/wp52\/este-posibila-calatoria-cu-viteze-mai-mari-decat-cea-luminii-daca-da-putea-calatori-trecut\/","title":{"rendered":"Este posibil\u0103 c\u0103l\u0103toria cu viteze mai mari dec\u00e2t cea a luminii? Dac\u0103 da, am putea c\u0103l\u0103tori \u00een trecut&#8230;"},"content":{"rendered":"<p><a href=\"https:\/\/www.lovendal.ro\/wp52\/wp-content\/uploads\/2017\/08\/mai-mare-decat-viteza-luminii.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"alignleft size-full wp-image-52685\" src=\"https:\/\/www.lovendal.ro\/wp52\/wp-content\/uploads\/2017\/08\/mai-mare-decat-viteza-luminii.jpg\" alt=\"\" width=\"334\" height=\"200\" \/><\/a>C\u0103l\u0103toria cu vitez\u0103 mai mare dec\u00e2t viteza luminii este un subiect interesant \u0219i controversat. Conform relativit\u0103\u021bii speciale, orice lucru care ar putea c\u0103l\u0103tori mai repede dec\u00e2t lumina s-ar mi\u0219ca \u00eenapoi \u00een timp. \u00cen acela\u0219i timp, relativitatea special\u0103 afirm\u0103 c\u0103 acest lucru ar necesita o energie infinit\u0103.<\/p>\n<p>Comunic\u0103rile \u0219i c\u0103l\u0103toriile mai rapide dec\u00e2t lumina (superluminice sau FTL) se refer\u0103 la propagarea informa\u021biilor sau materiei mai rapid\u0103 dec\u00e2t viteza luminii. \u00cen teoria special\u0103 a relativit\u0103\u021bii, o particul\u0103 (care are o mas\u0103) cu vitez\u0103 subluminal\u0103 are nevoie de o energie infinit\u0103 pentru a accelera la viteza luminii, de\u0219i relativitatea special\u0103 nu interzice existen\u021ba particulelor care c\u0103l\u0103toresc mai repede dec\u00e2t lumina \u00een orice moment. Pe de alt\u0103 parte, ceea ce unii fizicieni se refer\u0103 la FTL &#8222;aparent&#8221; sau &#8222;eficient&#8221; este ipoteza c\u0103 regiuni neobi\u0219nuite distorsionate ale timpului \u015fi spa\u021biului ar putea permite materiei s\u0103 ajung\u0103 \u00een loca\u021bii \u00eendep\u0103rtate mai repede dec\u00e2t i-ar lua luminii un traseu &#8222;normal&#8221;.<\/p>\n<p>\u00cen aparen\u0163\u0103, FTL nu este exclus \u00een relativitatea general\u0103. Exemple de propuneri pentru FTL sunt unit\u0103\u0163ile Alcubierre \u0219i gaura de vierme traversabil\u0103, de\u0219i plauzibilitatea fizic\u0103 a acestor solu\u021bii este incert\u0103.<\/p>\n<p>Caracteristicile cheie ale c\u0103l\u0103toriei cu viteza mai mare dec\u00e2t cea a luminii sunt prezentate mai jos:<br \/>\n* posibilitatea de a c\u0103l\u0103tori \u00een viitor \u015fi \u00een trecut;<br \/>\n* posibilitatea transportului materiei \u015fi informa\u0163iei.<\/p>\n<p>FTL \u00eenseamn\u0103 transmiterea de informa\u021bii sau materie mai repede dec\u00e2t c, o constant\u0103 egal\u0103 cu viteza luminii \u00eentr-un vid, adic\u0103 299.792.458 de metri pe secund\u0103 sau aproximativ 300.000 km pe secund\u0103. Acest lucru nu este acela\u0219i lucru cu c\u0103l\u0103toria mai rapid\u0103 dec\u00e2t lumina, deoarece:<br \/>\n&#8211; unele procese se propag\u0103 mai repede dec\u00e2t c, dar nu pot transporta informa\u021bii;<br \/>\n&#8211; lumina se deplaseaz\u0103 la viteza c\/n c\u00e2nd nu se afl\u0103 \u00een vid, ci c\u00e2nd se afl\u0103 \u00eentr-un mediu cu indicele de refrac\u021bie = n (care provoac\u0103 refrac\u021bia), iar \u00een unele materiale alte particule pot c\u0103l\u0103tori mai repede dec\u00e2t c\/n (dar mai lent dec\u00e2t c), rezult\u00e2nd radia\u021bia Cherenkov.<\/p>\n<p>Comunicarea mai rapid\u0103 dec\u00e2t lumina este, prin teoria relativit\u0103\u021bii lui Einstein, echivalent\u0103 cu c\u0103l\u0103toria \u00een timp. Conform teoriei lui Einstein a relativit\u0103\u021bii speciale, ceea ce m\u0103sur\u0103m ca viteza luminii \u00eentr-un vid este de fapt constanta fizic\u0103 fundamental\u0103 c. Aceasta \u00eenseamn\u0103 c\u0103 to\u021bi observatorii, indiferent de viteza lor relativ\u0103, vor m\u0103sura \u00eentotdeauna particule de mas\u0103 zero, cum ar fi fotonii care se deplaseaz\u0103 cu c \u00een vid. Acest rezultat \u00eenseamn\u0103 c\u0103 m\u0103sur\u0103torile de timp \u0219i de vitez\u0103 \u00een diferite cadre nu mai sunt legate pur \u0219i simplu de schimb\u0103rile constante, ci sunt \u00een schimb legate de transform\u0103rile Poincar\u00e9. Aceste transform\u0103ri au implica\u021bii importante:<br \/>\n&#8211; impulsul relativist al unei particule masive ar cre\u0219te cu viteza \u00eentr-un asemenea mod \u00eenc\u00e2t la viteza luminii un obiect ar avea un impuls infinit;<br \/>\n&#8211; pentru a accelera un obiect de mas\u0103 non-zero la c, ar necesita un timp infinit cu o accelerare finit\u0103 sau accelerare infinit\u0103 pentru o perioad\u0103 finit\u0103 de timp;<br \/>\n&#8211; \u00een orice caz, o astfel de accelerare necesit\u0103 o energie infinit\u0103. Dep\u0103\u0219ind viteza luminii \u00eentr-un spa\u021biu omogen ar necesita mai mult dec\u00e2t energie infinit\u0103, care, \u00een general, nu este considerat\u0103 o no\u021biune sensibil\u0103.<\/p>\n<p>Orice c\u0103l\u0103torie mai rapid\u0103 dec\u00e2t lumina va fi v\u0103zut\u0103 ca o c\u0103l\u0103torie \u00eenapoi \u00een timp. O op\u021biune foarte interesant\u0103 este aceea de a presupune existen\u021ba unui alt t\u0103r\u00e2m (hiperspa\u021biu, subspa\u021biu sau spa\u021biu liber), accesibil din acest Univers, \u00een care legile relativit\u0103\u021bii sunt de obicei distorsionate, \u00eendoite sau inexistente, facilit\u00e2nd rapid transportul \u00eentre puncte \u00eendep\u0103rtate din acest Univers, uneori cu diferen\u021be de accelera\u021bie &#8211; adic\u0103 nu necesit\u0103 mai mult\u0103 energie pentru a merge mai repede. Pentru a realiza transportul rapid \u00eentre punctele din hiperspa\u021biu \/ subspa\u021biu, se presupune c\u0103 relativitatea special\u0103 nu se aplic\u0103 \u00een acest alt t\u0103r\u00e2m sau c\u0103 viteza luminii este mai mare.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>C\u0103l\u0103toria cu vitez\u0103 mai mare dec\u00e2t viteza luminii este un subiect interesant \u0219i controversat. Conform relativit\u0103\u021bii speciale, orice lucru care ar putea c\u0103l\u0103tori mai repede dec\u00e2t lumina s-ar mi\u0219ca \u00eenapoi \u00een timp. \u00cen acela\u0219i timp, relativitatea special\u0103 afirm\u0103 c\u0103 acest &#8230; <\/p>\n<p class=\"read-more-container\"><a title=\"Este posibil\u0103 c\u0103l\u0103toria cu viteze mai mari dec\u00e2t cea a luminii? Dac\u0103 da, am putea c\u0103l\u0103tori \u00een trecut&#8230;\" class=\"read-more button\" href=\"https:\/\/www.lovendal.ro\/wp52\/este-posibila-calatoria-cu-viteze-mai-mari-decat-cea-luminii-daca-da-putea-calatori-trecut\/#more-52683\" aria-label=\"Cite\u0219te mai multe despre Este posibil\u0103 c\u0103l\u0103toria cu viteze mai mari dec\u00e2t cea a luminii? Dac\u0103 da, am putea c\u0103l\u0103tori \u00een trecut&#8230;\">Cititi mai multe<\/a><\/p>\n","protected":false},"author":1,"featured_media":52685,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[11042,2833],"tags":[5633,6826,610,66,11043,4752,3510,4526,952,436,345,3204,2501,1104,789,1084,1087,3629,2108,2916],"class_list":["post-52683","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-fizica-chimie","category-noutati","tag-acceleratie","tag-calatorie-in-timp","tag-einstein","tag-energie","tag-fizica-chimie","tag-fotoni","tag-gaura-de-vierme","tag-hiperspatiu","tag-lumina","tag-masa","tag-materie","tag-radiatii","tag-spatiu","tag-teoria-relativitatii","tag-timp","tag-trecut","tag-univers","tag-vid","tag-viitor","tag-viteza-luminii","resize-featured-image"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v23.3 (Yoast SEO v24.2) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Este posibil\u0103 c\u0103l\u0103toria cu viteze mai mari dec\u00e2t cea a luminii? 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