{"id":90579,"date":"2024-05-05T22:41:25","date_gmt":"2024-05-05T19:41:25","guid":{"rendered":"https:\/\/www.lovendal.ro\/wp52\/?p=90579"},"modified":"2024-05-05T22:41:25","modified_gmt":"2024-05-05T19:41:25","slug":"ar-putea-extraterestrii-sa-creeze-masa-negativa-si-sa-calatoreasca-in-trecut-cea-este-curba-inchisa-a-timpului","status":"publish","type":"post","link":"https:\/\/www.lovendal.ro\/wp52\/ar-putea-extraterestrii-sa-creeze-masa-negativa-si-sa-calatoreasca-in-trecut-cea-este-curba-inchisa-a-timpului\/","title":{"rendered":"Ar putea extratere\u0219trii s\u0103 creeze mas\u0103 negativ\u0103 \u0219i s\u0103 c\u0103l\u0103toreasc\u0103 \u00een trecut? Cea este &#8222;Curba \u00eenchis\u0103 a timpului&#8221;?"},"content":{"rendered":"<figure id=\"attachment_90580\" aria-describedby=\"caption-attachment-90580\" style=\"width: 346px\" class=\"wp-caption alignleft\"><a href=\"https:\/\/www.lovendal.ro\/wp52\/wp-content\/uploads\/2024\/05\/masina-timpului-extraterestri.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-90580\" src=\"https:\/\/www.lovendal.ro\/wp52\/wp-content\/uploads\/2024\/05\/masina-timpului-extraterestri.jpg\" alt=\"\" width=\"356\" height=\"266\" srcset=\"https:\/\/www.lovendal.ro\/wp52\/wp-content\/uploads\/2024\/05\/masina-timpului-extraterestri.jpg 356w, https:\/\/www.lovendal.ro\/wp52\/wp-content\/uploads\/2024\/05\/masina-timpului-extraterestri-300x224.jpg 300w, https:\/\/www.lovendal.ro\/wp52\/wp-content\/uploads\/2024\/05\/masina-timpului-extraterestri-200x150.jpg 200w\" sizes=\"auto, (max-width: 356px) 100vw, 356px\" \/><\/a><figcaption id=\"caption-attachment-90580\" class=\"wp-caption-text\"><strong>Imagine:<\/strong> <a href=\"https:\/\/pixabay.com\/ro\/illustrations\/ai-generat-inele-ma%C8%99ina-timpului-8269486\/\" target=\"_blank\" rel=\"noopener\"><strong>pixabay.com<\/strong><\/a> (Commons Creative &#8211; free)<\/figcaption><\/figure>\n<p>\u00cen 1957, astrofizicianul Hermann Bondi a scris o lucrare care ia \u00een considerare posibila existen\u021b\u0103 a masei negative \u00een teoria gravita\u021biei a lui Albert Einstein. O mas\u0103 negativ\u0103 ar respinge o mas\u0103 pozitiv\u0103. Astfel, o pereche de mase pozitive \u0219i negative ar putea accelera \u00eempreun\u0103 la viteza luminii. Masa negativ\u0103 ar \u00eempinge masa pozitiv\u0103, care la r\u00e2ndul ei ar trage masa negativ\u0103. Perechea care fuge ar accelera la infinit, f\u0103r\u0103 a fi nevoie de combustibil sau de un sistem de propulsie. Conservarea energiei nu ar fi \u00eenc\u0103lcat\u0103 deoarece suma celor dou\u0103 mase este zero.<\/p>\n<p>Existen\u021ba masei negative \u00een natur\u0103 ar permite o ma\u0219in\u0103 a timpului \u00een care s\u0103 putem vizita trecutul. Motivul este simplu. O mas\u0103 pozitiv\u0103 \u00eent\u00e2rzie sosirea luminii care trece \u00een apropierea ei, a\u0219a cum a stabilit Irwin Shapiro, care a inventat conceptul de &#8222;decalajul temporal Shapiro&#8221;.\u00a0Acesta, l\u00e2ng\u0103 o mas\u0103 pozitiv\u0103 inverseaz\u0103 semnul \u0219i se transform\u0103 \u00eentr-un &#8222;avans \u00een timp Shapiro&#8221; l\u00e2ng\u0103 o mas\u0103 negativ\u0103. Dac\u0103 expeditorul se mi\u0219c\u0103 suficient de aproape de viteza luminii, avansul \u00een timp Shapiro ar \u00eensemna c\u0103 un semnal luminos poate fi reflectat de o oglind\u0103 \u0219i poate ajunge \u00eenapoi la expeditor atunci c\u00e2nd ceasul expeditorului arat\u0103 cu o or\u0103 mai devreme dec\u00e2t timpul de transmisie ini\u021bial al acelasi semnal. \u00cen mod efectiv, avansul \u00een timp Shapiro este echivalent cu comunicarea cu o particul\u0103 mai rapid\u0103 dec\u00e2t lumina, care \u00eencalc\u0103 cauzalitatea.<\/p>\n<p>\u00cen cadrul standard al gravita\u021biei lui Einstein, termenul tehnic pentru o astfel de ma\u0219in\u0103 a timpului este &#8222;curb\u0103 \u00eenchis\u0103 a timpului&#8221;. Astfel, o mas\u0103 negativ\u0103 le-ar permite copiilor s\u0103-\u0219i \u00eempiedice p\u0103rin\u021bii s\u0103 le dea na\u0219tere, o inconsecven\u021b\u0103 logic\u0103. Ma\u0219inile timpului pot fi create \u0219i folosind g\u0103uri de vierme traversabile, care, dup\u0103 cum a recunoscut Stephen Hawking \u00eentr-un articol din 1992 <em><strong>&#8222;Protec\u021bia cronologiei&#8221;<\/strong><\/em>, necesit\u0103, de asemenea, energie negativ\u0103. Rezumatul lucr\u0103rii Hawking \u00eencepe cu propozi\u021bia: <em>&#8222;S-a sugerat c\u0103 o civiliza\u021bie avansat\u0103 ar putea avea tehnologia de a deforma spa\u021biul-timp, astfel \u00eenc\u00e2t s\u0103 apar\u0103 curbe \u00eenchise asem\u0103n\u0103toare timpului, permi\u021b\u00e2nd c\u0103l\u0103toria \u00een trecut&#8221;<\/em> \u0219i se \u00eencheie cu propozi\u021bia: <em>&#8222;Aceste rezultate sus\u021bine conjectura de protec\u021bie a cronologiei: legile fizicii nu permit apari\u021bia unor curbe \u00eenchise asem\u0103n\u0103toare timpului&#8221;.<\/em><\/p>\n<p>\u00cen gravita\u021bia lui Einstein, P\u0103m\u00e2ntul orbiteaz\u0103 \u00een jurul Soarelui, deoarece Soarele curbeaz\u0103 spa\u021biul. Curbura spa\u021biu-timp creat\u0103 de Soare \u00een loca\u021bia noastr\u0103 este caracterizat\u0103 de o scar\u0103 de lungime care este egal\u0103 cu inversul r\u0103d\u0103cinii p\u0103trate a lui <em>(GM\/r\u00b3c\u00b2)<\/em>, unde <em>G<\/em> este constanta lui Newton, <em>M<\/em> este masa Soarelui, <em>r<\/em> este distan\u0163a P\u0103m\u00e2nt-Soare, iar <em>c<\/em> este viteza luminii. Dac\u0103 se introduc cifrele corespunz\u0103toare, ob\u021binem o lungime de curbur\u0103 de 10.000 de ori mai mare dec\u00e2t distan\u021ba dintre P\u0103m\u00e2nt \u0219i Soare. O alt\u0103 modalitate de a ob\u021bine aceast\u0103 cifr\u0103 este s\u0103 recunoa\u0219tem c\u0103 viteza P\u0103m\u00e2ntului \u00een jurul Soarelui este de 10.000 de ori mai mic\u0103 dec\u00e2t viteza luminii, <em>c<\/em>.<\/p>\n<p>Alte obiecte astrofizice arat\u0103 o curbur\u0103 mai mare a spa\u021biu-timpului pe o scar\u0103 de lungime mai mic\u0103. Cele mai mari distorsiuni ale spa\u021biu-timpului sunt a\u0219teptate \u00een apropierea unei g\u0103uri negre. Limit\u00e2ndu-ne aten\u021bia la regiunea accesibil\u0103 din afara orizontului evenimentului, aceast\u0103 lungime de curbur\u0103 se scaleaz\u0103 propor\u021bional cu masa g\u0103urii negre. Cele mai masive g\u0103uri negre din Univers au o mas\u0103 de zece miliarde de mase solare \u0219i o scar\u0103 de curbur\u0103 de 1.000 de ori mai mare dec\u00e2t distan\u0163a P\u0103m\u00e2nt-Soare. Lungimea curburii este redus\u0103 de miliarde de ori \u00een cazul g\u0103urilor negre sau a stelelor neutronice formate \u00een urma pr\u0103bu\u0219irii stelelor masive.<\/p>\n<p>Care este cea mai mare curbur\u0103 a spa\u021biu-timpului pe care am observat-o p\u00e2n\u0103 acum \u00een Univers? Ea corespunde unei scale de lungime de aproximativ 24 de kilometri, de dimensiunea unui ora\u0219 mare de pe P\u0103m\u00e2nt, \u0219i se desf\u0103\u0219oar\u0103 pe suprafa\u021ba stelelor neutronice care poart\u0103 aproximativ de dou\u0103 ori masa Soarelui \u00een densitate nuclear\u0103. Aceea\u0219i curbur\u0103 a spa\u021biului-timp caracterizeaz\u0103 un nucleu atomic deoarece are aceea\u0219i densitate de materie ca o stea neutronic\u0103. Dar o lungime de curbur\u0103 de 24 de kilometri este cu 19 ordine de m\u0103rime mai mare dec\u00e2t dimensiunea unui nucleu atomic \u0219i, prin urmare, nu are nicio importan\u021b\u0103 atunci c\u00e2nd nucleele se ciocnesc \u00eentre ele la Large Hadron Collider al CERN.<\/p>\n<p>\u00cen concluzie, pe baza a tot ceea ce \u0219tim din observa\u021bii sau teorie \u00een cadrul modelului standard al fizicii, masele negative sunt interzise din acela\u0219i motiv pentru care ma\u0219inile timpului nu sunt permise. Dac\u0103 extratere\u0219trii ar fi fost capabili s\u0103 creeze mase negative \u0219i s\u0103 le foloseasc\u0103 pentru a c\u0103l\u0103tori, atunci ar fi putut \u0219i ei s\u0103 c\u0103l\u0103toreasc\u0103 \u00een timp. Dac\u0103 c\u0103l\u0103toria \u00een timp ar fi fost fezabil\u0103, atunci genera\u021biile viitoare de fizicieni gravita\u021biei cuantice ar fi putut s\u0103 viziteze P\u0103m\u00e2ntul \u0219i s\u0103 ne rescrie istoria dup\u0103 bunul plac. De exemplu, ar fi putut s\u0103-l elimine pe Adolf Hitler \u0219i s\u0103 permit\u0103 \u0219ase milioane de evrei s\u0103 prospere \u00een Europa \u00eentre 1939 \u0219i 1945. Faptul c\u0103 acest lucru nu s-a \u00eent\u00e2mplat niciodat\u0103 sugereaz\u0103 c\u0103 fie ma\u0219inile timpului nu vor fi construite niciodat\u0103 \u00een viitorul nostru, fie creatorii lor n-au niciun interes \u00een a salva vie\u021bi omene\u0219ti.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u00cen 1957, astrofizicianul Hermann Bondi a scris o lucrare care ia \u00een considerare posibila existen\u021b\u0103 a masei negative \u00een teoria gravita\u021biei a lui Albert Einstein. O mas\u0103 negativ\u0103 ar respinge o mas\u0103 pozitiv\u0103. Astfel, o pereche de mase pozitive \u0219i &#8230; <\/p>\n<p class=\"read-more-container\"><a title=\"Ar putea extratere\u0219trii s\u0103 creeze mas\u0103 negativ\u0103 \u0219i s\u0103 c\u0103l\u0103toreasc\u0103 \u00een trecut? Cea este &#8222;Curba \u00eenchis\u0103 a timpului&#8221;?\" class=\"read-more button\" href=\"https:\/\/www.lovendal.ro\/wp52\/ar-putea-extraterestrii-sa-creeze-masa-negativa-si-sa-calatoreasca-in-trecut-cea-este-curba-inchisa-a-timpului\/#more-90579\" aria-label=\"Cite\u0219te mai multe despre Ar putea extratere\u0219trii s\u0103 creeze mas\u0103 negativ\u0103 \u0219i s\u0103 c\u0103l\u0103toreasc\u0103 \u00een trecut? Cea este &#8222;Curba \u00eenchis\u0103 a timpului&#8221;?\">Cititi mai multe<\/a><\/p>\n","protected":false},"author":1,"featured_media":90580,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[11042],"tags":[5636,6826,4573,610,66,341,218,51,348,11043,3510,1367,4896,85,3486,952,1225,345,8421,105,865,2501,3443,3175,789,1084,2916],"class_list":["post-90579","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-fizica-chimie","tag-astrofizician","tag-calatorie-in-timp","tag-cern","tag-einstein","tag-energie","tag-europa","tag-evrei","tag-extraterestri","tag-fizica","tag-fizica-chimie","tag-gaura-de-vierme","tag-gravitatie","tag-hawking","tag-hitler","tag-lhc","tag-lumina","tag-masina-timpului","tag-materie","tag-nucleu","tag-pamant","tag-soare","tag-spatiu","tag-stea-neutronica","tag-stele","tag-timp","tag-trecut","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>Ar putea extratere\u0219trii s\u0103 creeze mas\u0103 negativ\u0103 \u0219i s\u0103 c\u0103l\u0103toreasc\u0103 \u00een trecut? 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