{"id":79980,"date":"2022-04-28T23:54:51","date_gmt":"2022-04-28T20:54:51","guid":{"rendered":"https:\/\/www.lovendal.ro\/wp52\/?p=79980"},"modified":"2022-04-28T23:54:51","modified_gmt":"2022-04-28T20:54:51","slug":"un-fizician-ne-ofera-o-teorie-fascinanta-calatoria-in-timp-este-posibila-doar-in-linii-temporale-paralele","status":"publish","type":"post","link":"https:\/\/www.lovendal.ro\/wp52\/un-fizician-ne-ofera-o-teorie-fascinanta-calatoria-in-timp-este-posibila-doar-in-linii-temporale-paralele\/","title":{"rendered":"Un fizician ne ofer\u0103 o teorie fascinant\u0103: c\u0103l\u0103toria \u00een timp este posibil\u0103, doar \u00een linii temporale paralele"},"content":{"rendered":"
\"\"<\/a>
Imagine:<\/strong> pixabay.com<\/strong><\/a> (Commons Creative – free)<\/figcaption><\/figure>\n

Fizicianul Barak Shoshany exploreaz\u0103 posibilitatea c\u0103 \u00eentr-o zi s\u0103 putem c\u0103l\u0103tori \u00een timp. Iat\u0103 ideile sale principale de pe site-ul The Conversation<\/strong><\/a>:<\/p>\n

* Ai f\u0103cut vreodat\u0103 o gre\u0219eal\u0103 pe care ai vrea s\u0103 o po\u021bi anula? Corectarea gre\u0219elilor din trecut este unul dintre motivele pentru care consider\u0103m conceptul de c\u0103l\u0103torie \u00een timp at\u00e2t de fascinant. A\u0219a cum \u00eent\u00e2lnim \u00een SF, cu o ma\u0219in\u0103 a timpului, nimic nu mai este permanent – po\u021bi oric\u00e2nd s\u0103 te \u00eentorci \u0219i s\u0103 schimbi un anumit lucru. Dar este c\u0103l\u0103toria \u00een timp cu adev\u0103rat posibil\u0103 \u00een universul nostru sau este doar fic\u021biune?<\/p>\n

* \u00cen\u021belegerea noastr\u0103 modern\u0103 a timpului \u0219i a cauzalit\u0103\u021bii provine din relativitatea general\u0103. Teoria lui Einstein combin\u0103 spa\u021biul \u0219i timpul \u00eentr-o singur\u0103 entitate – „spa\u021biu-timp” – \u0219i ofer\u0103 o explica\u021bie remarcabil de complicat\u0103 a modului \u00een care func\u021bioneaz\u0103 ambele, la un nivel neegalat de nicio alt\u0103 teorie consacrat\u0103. Aceast\u0103 teorie exist\u0103 de mai bine de 100 de ani \u0219i a fost verificat\u0103 experimental cu o precizie extrem de ridicat\u0103, a\u0219a c\u0103 fizicienii sunt destul de siguri c\u0103 ofer\u0103 o descriere precis\u0103 a structurii cauzale a Universului nostru.<\/p>\n

* De zeci de ani, fizicienii au \u00eencercat s\u0103 foloseasc\u0103 relativitatea general\u0103 pentru a-\u0219i da seama dac\u0103 c\u0103l\u0103toria \u00een timp este posibil\u0103. Se pare c\u0103 pute\u021bi scrie ecua\u021bii care descriu c\u0103l\u0103toria \u00een timp \u0219i sunt pe deplin compatibile \u0219i consecvente cu relativitatea. Dar fizica nu este matematic\u0103, iar ecua\u021biile sunt lipsite de sens dac\u0103 nu corespund cu nimic \u00een realitate.<\/p>\n

* Exist\u0103 dou\u0103 probleme principale care ne fac s\u0103 credem c\u0103 aceste ecua\u021bii pot fi nerealiste. Prima problem\u0103 este una practic\u0103: construirea unei ma\u0219ini a timpului pare s\u0103 necesite materie exotic\u0103, care este materie cu energie negativ\u0103. Toat\u0103 materia pe care o vedem \u00een via\u021ba noastr\u0103 de zi cu zi are energie pozitiv\u0103 – materia cu energie negativ\u0103 nu este ceva pe care s\u0103-l g\u0103se\u0219ti \u00een preajm\u0103. Din mecanica cuantic\u0103, \u0219tim c\u0103 o astfel de materie poate fi creat\u0103 teoretic, dar \u00een cantit\u0103\u021bi prea mici \u0219i pentru timpi prea scurti. Cu toate acestea, nu exist\u0103 nicio dovad\u0103 c\u0103 este imposibil s\u0103 se creeze materie exotic\u0103 \u00een cantit\u0103\u021bi suficiente. Mai mult, pot fi descoperite \u0219i alte ecua\u021bii care permit c\u0103l\u0103toria \u00een timp f\u0103r\u0103 a necesita materie exotic\u0103. Prin urmare, aceast\u0103 problem\u0103 poate fi doar o limitare a tehnologiei noastre actuale sau a \u00een\u021belegerii mecanicii cuantice.<\/p>\n

* Cealalt\u0103 problem\u0103 principal\u0103 este mai pu\u021bin practic\u0103, dar mai semnificativ\u0103: c\u0103l\u0103toria \u00een timp pare s\u0103 contrazic\u0103 logica, sub forma paradoxurilor c\u0103l\u0103toriei \u00een timp. Exist\u0103 mai multe tipuri de astfel de paradoxuri, dar cele mai problematice sunt paradoxurile de consisten\u021b\u0103. Paradoxurile consisten\u021bei se \u00eent\u00e2mpl\u0103 ori de c\u00e2te ori exist\u0103 un anumit eveniment care duce la schimbarea trecutului, dar schimbarea \u00een sine \u00eempiedic\u0103 acest eveniment s\u0103 se \u00eent\u00e2mple! De exemplu, un scenariu ar fi acesta: intru \u00eentr-o ma\u015fin\u0103 a timpului, o folosesc pentru a reveni \u00een timp \u00een urm\u0103 cu 5 minute \u0219i distrug ma\u0219ina de \u00eendat\u0103 ce ajung \u00een trecut. Acum, c\u0103 am distrus ma\u0219ina timpului, mi-ar fi imposibil s\u0103 o folosesc 5 minute mai t\u00e2rziu. Dar, dac\u0103 nu pot folosi ma\u0219ina timpului, atunci nu pot s\u0103 m\u0103 \u00eentorc \u00een timp \u0219i s\u0103 o distrug. Prin urmare, nu este distrus, a\u0219a c\u0103 pot s\u0103 m\u0103 \u00eentorc \u00een timp \u0219i s\u0103-l distrug. Cu alte cuvinte, ma\u0219ina timpului este distrus\u0103 dac\u0103 \u0219i numai dac\u0103 nu este distrus\u0103. Deoarece nu poate fi at\u00e2t distrus, c\u00e2t \u0219i nedistrus simultan, acest scenariu este inconsecvent \u0219i paradoxal.<\/p>\n

* Exist\u0103 o concep\u021bie gre\u0219it\u0103 comun\u0103 \u00een SF, \u015fi anume c\u0103 paradoxurile pot fi „create”. C\u0103l\u0103torii \u00een timp sunt de obicei avertiza\u021bi s\u0103 nu fac\u0103 schimb\u0103ri semnificative \u00een trecut \u0219i s\u0103 evite s\u0103-\u0219i \u00eent\u00e2lneasc\u0103 sinele trecut, tocmai din acest motiv. Exemple \u00een acest sens pot fi g\u0103site \u00een multe filme SF de c\u0103l\u0103torie \u00een timp, cum ar fi trilogia „\u00cenapoi \u00een viitor”<\/em> („Back to the Future”<\/em>).<\/p>\n

* Dar, \u00een fizic\u0103 un paradox nu este un eveniment care se poate \u00eent\u00e2mpla – este un concept pur teoretic care indic\u0103 o inconsecven\u021b\u0103 \u00een teoria \u00eens\u0103\u0219i. Cu alte cuvinte, paradoxurile consisten\u021bei nu implic\u0103 doar c\u0103 aceast\u0103 c\u0103l\u0103torie \u00een timp este o activitate periculoas\u0103, ci \u00eenseamn\u0103 c\u0103 pur \u0219i simplu nu poate fi posibil\u0103. Aceasta a fost una dintre motiva\u021biile pentru care fizicianul Stephen Hawking a spus c\u0103 aceast\u0103 c\u0103l\u0103torie \u00een timp ar trebui s\u0103 fie imposibil\u0103. Cu toate acestea, p\u00e2n\u0103 acum aceast\u0103 presupunere r\u0103m\u00e2ne nedovedit\u0103. \u00cen plus, Universul ar fi un loc mult mai interesant dac\u0103 \u00een loc s\u0103 elimin\u0103m c\u0103l\u0103toria \u00een timp din cauza paradoxurilor, am putea elimina paradoxurile \u00een sine.<\/p>\n

* O \u00eencercare de a rezolva paradoxurile c\u0103l\u0103toriei \u00een timp este conjectura de autoconsisten\u021b\u0103 a fizicianului teoretician Igor D. Novikov, care afirm\u0103 \u00een esen\u021b\u0103 c\u0103 po\u021bi c\u0103l\u0103tori \u00een trecut, dar nu \u00eel po\u021bi schimba. Potrivit lui Novikov, dac\u0103 a\u0219 \u00eencerca s\u0103-mi distrug ma\u0219ina timpului, f\u0103c\u00e2nd o c\u0103l\u0103torie de 5 minute \u00een trecut, a\u0219 descoperi c\u0103 este imposibil s\u0103 o fac. Legile fizicii ar conspira cumva pentru a p\u0103stra consisten\u021ba.<\/p>\n

* Dar atunci, ce rost mai are s\u0103 te \u00eentorci \u00een timp dac\u0103 nu po\u021bi schimba trecutul? Dar, exist\u0103 paradoxuri de c\u0103l\u0103torie \u00een timp pe care conjectura lui Novikov nu le poate rezolva. Acest lucru ne duce \u00eenapoi la punctul ini\u0163ial, deoarece dac\u0103 chiar \u0219i un singur paradox nu poate fi eliminat, c\u0103l\u0103toria \u00een timp r\u0103m\u00e2ne logic imposibil\u0103.<\/p>\n

* A\u015fadar, c\u0103l\u0103toria \u00een timp este imposibil\u0103? Nu chiar. Permiterea unor istorii multiple (sau, \u00een termeni mai familiari, linii temporale paralele) poate rezolva paradoxurile pe care conjectura lui Novikov nu le poate rezolva. De fapt, poate rezolva orice paradox pe care l-a\u0163i g\u00e2ndi.<\/p>\n

* Ideea este foarte simpl\u0103. C\u00e2nd ies din ma\u0219ina timpului, ies \u00eentr-o linie temporal\u0103 diferit\u0103. \u00cen acea cronologie, pot face tot ce vreau, inclusiv distrugerea ma\u0219inii timpului, f\u0103r\u0103 a schimba nimic din cronologia original\u0103 din care am venit. Deoarece nu pot distruge ma\u0219ina timpului \u00een cronologia original\u0103, care este cea pe care obi\u0219nuiam s\u0103 c\u0103l\u0103toresc \u00eenapoi \u00een timp, nu exist\u0103 paradox.<\/p>\n

* A\u015fadar, c\u0103l\u0103toria \u00een timp ar putea fi posibil\u0103, dar numai dac\u0103 Universul nostru poate permite mai multor istorii s\u0103 coexiste. Deci, se poate?<\/p>\n

* C\u0103l\u0103toria \u00een timp \u0219i liniile temporale paralele merg aproape \u00eentotdeauna m\u00e2n\u0103 \u00een m\u00e2n\u0103 \u00een SF, dar acum avem dovezi c\u0103 trebuie s\u0103 mearg\u0103 m\u00e2n\u0103 \u00een m\u00e2n\u0103 \u0219i \u00een \u0219tiin\u021ba real\u0103. Relativitatea general\u0103 \u0219i mecanica cuantic\u0103 ne spun c\u0103 c\u0103l\u0103toria \u00een timp ar putea fi posibil\u0103, dar dac\u0103 este, atunci trebuie s\u0103 fie posibile \u0219i liniile temporale paralele.<\/p>\n","protected":false},"excerpt":{"rendered":"

Fizicianul Barak Shoshany exploreaz\u0103 posibilitatea c\u0103 \u00eentr-o zi s\u0103 putem c\u0103l\u0103tori \u00een timp. Iat\u0103 ideile sale principale de pe site-ul The Conversation: * Ai f\u0103cut vreodat\u0103 o gre\u0219eal\u0103 pe care ai vrea s\u0103 o po\u021bi anula? Corectarea gre\u0219elilor din trecut … <\/p>\n

Cititi mai multe<\/a><\/p>\n","protected":false},"author":1,"featured_media":79981,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[11042],"tags":[8731,6826,610,260,348,11043,2048,4896,1225,1722,345,8649,13472,2174,2501,1104,789,1084,1087],"class_list":["post-79980","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-fizica-chimie","tag-back-to-the-future","tag-calatorie-in-timp","tag-einstein","tag-film","tag-fizica","tag-fizica-chimie","tag-fizician","tag-hawking","tag-masina-timpului","tag-matematica","tag-materie","tag-mecanica-cuantica","tag-paradox","tag-sf","tag-spatiu","tag-teoria-relativitatii","tag-timp","tag-trecut","tag-univers","resize-featured-image"],"yoast_head":"\nUn fizician ne ofer\u0103 o teorie fascinant\u0103: c\u0103l\u0103toria \u00een timp este posibil\u0103, doar \u00een linii temporale paralele - Secretele lui Lovendal<\/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.lovendal.ro\/wp52\/un-fizician-ne-ofera-o-teorie-fascinanta-calatoria-in-timp-este-posibila-doar-in-linii-temporale-paralele\/\" \/>\n<meta property=\"og:locale\" content=\"ro_RO\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Un fizician ne ofer\u0103 o teorie fascinant\u0103: c\u0103l\u0103toria \u00een timp este posibil\u0103, doar \u00een linii temporale paralele\" \/>\n<meta property=\"og:description\" content=\"Fizicianul Barak Shoshany exploreaz\u0103 posibilitatea c\u0103 \u00eentr-o zi s\u0103 putem c\u0103l\u0103tori \u00een timp. 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