{"id":80470,"date":"2022-06-06T20:14:03","date_gmt":"2022-06-06T17:14:03","guid":{"rendered":"https:\/\/www.lovendal.ro\/wp52\/?p=80470"},"modified":"2022-06-06T20:14:03","modified_gmt":"2022-06-06T17:14:03","slug":"un-univers-oglinda-e-posibil-sa-existe-alaturi-de-universul-nostru-spune-un-nou-studiu-stiintific-ne-am-putea-gasi-acolo-dublura-din-lumea-noastra","status":"publish","type":"post","link":"https:\/\/www.lovendal.ro\/wp52\/un-univers-oglinda-e-posibil-sa-existe-alaturi-de-universul-nostru-spune-un-nou-studiu-stiintific-ne-am-putea-gasi-acolo-dublura-din-lumea-noastra\/","title":{"rendered":"Un Univers-oglind\u0103 e posibil s\u0103 existe al\u0103turi de Universul nostru &#8211; spune un nou studiu \u015ftiin\u0163ific. Ne-am putea g\u0103si acolo dublura din lumea noastr\u0103?"},"content":{"rendered":"<figure id=\"attachment_80471\" aria-describedby=\"caption-attachment-80471\" style=\"width: 348px\" class=\"wp-caption alignleft\"><a href=\"https:\/\/www.lovendal.ro\/wp52\/wp-content\/uploads\/2022\/06\/Univers-oglinda.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-80471\" src=\"https:\/\/www.lovendal.ro\/wp52\/wp-content\/uploads\/2022\/06\/Univers-oglinda.jpg\" alt=\"\" width=\"358\" height=\"247\" \/><\/a><figcaption id=\"caption-attachment-80471\" class=\"wp-caption-text\"><strong>Imagine:<\/strong> <a href=\"https:\/\/pixabay.com\/ro\/photos\/lume-paralel%c4%83-univers-paralel-3488497\/\" target=\"_blank\" rel=\"noopener\"><strong>pixabay.com<\/strong><\/a> (Commons Creative &#8211; free)<\/figcaption><\/figure>\n<p>Ideea unui Univers-oglind\u0103 este \u00eent\u00e2lnit\u0103 \u00een literatura SF. O lume asem\u0103n\u0103toare cu a noastr\u0103, \u00een care ne-am putea g\u0103si &#8222;doppelganger-ul&#8221; (adic\u0103 dublura) sau o versiune a noastr\u0103 este o idee fascinant\u0103. Dar conceptul de Univers-oglind\u0103 a fost adesea studiat \u00een cosmologia teoretic\u0103 \u0219i, a\u0219a cum arat\u0103 un nou studiu, ne-ar putea ajuta s\u0103 rezolv\u0103m problemele cu constanta cosmologic\u0103.<\/p>\n<p>Constanta Hubble, sau parametrul Hubble, este o m\u0103sur\u0103 a ratei cu care Universul nostru se extinde. Aceast\u0103 expansiune a fost demonstrat\u0103 pentru prima dat\u0103 de astronomul Edwin Hubble. \u00cen urm\u0103toarele decenii, m\u0103sur\u0103torile acestei expansiuni au fost evaluate la o rat\u0103 de aproximativ 70 km\/sec\/Mpc. Astronomii s-au g\u00e2ndit c\u0103, pe m\u0103sur\u0103 ce m\u0103sur\u0103torile noastre deveneau mai precise, diferitele metode se vor stabili o valoare comun\u0103, dar asta nu s-a \u00eent\u00e2mplat. De fapt, \u00een ultimii c\u00e2\u021biva ani m\u0103sur\u0103torile au devenit at\u00e2t de precise \u00eenc\u00e2t nu sunt de acord \u00eentre ele.<\/p>\n<p>\u00cen acest moment, valorile observate ale constantei Hubble se grupeaz\u0103 \u00een dou\u0103 grupuri. M\u0103sur\u0103torile fluctua\u021biilor \u00een fondul cosmic cu microunde indic\u0103 o valoare mai mic\u0103, \u00een jur de 67 km\/sec\/Mpc, \u00een timp ce observa\u021biile unor obiecte precum supernovele \u00eendep\u0103rtate dau o valoare mai mare \u00een jur de 73 km\/sec\/Mpc. \u00cen mod clar, ceva nu se potrive\u0219te, iar fizicienii teoreticieni \u00eencearc\u0103 s\u0103-\u0219i dea seama de ce. Aici ar putea intra Universul-oglind\u0103.<\/p>\n<p>Ideea Universului-oglind\u0103 a fost studiat\u0103 \u00een fizic\u0103 \u00eenc\u0103 din anii &#8217;90, ca o modalitate de a trata problema simetriei materie-antimaterie. Putem crea particule de materie \u00een laborator, dar atunci c\u00e2nd facem, cre\u0103m \u0219i particule de antimaterie. \u00centotdeauna vin \u00een perechi. Deci, c\u00e2nd particulele s-au format \u00een Universul timpuriu, unde s-au dus to\u021bi fra\u021bii lor de antimaterie? O idee a fost c\u0103 Universul \u00eensu\u0219i s-a format ca o pereche: Universul nostru materie \u0219i un Univers similar de antimaterie. Problema rezolvat\u0103. Ideea a disp\u0103rut din diverse motive, dar acest nou studiu analizeaz\u0103 modul \u00een care s-ar putea rezolva problema constantei Hubble.<\/p>\n<p>\u00cen acest nou studiu intitulat <em>&#8222;<span dir=\"ltr\" role=\"presentation\">Symmetry of Cosmological Observables, a Mirror World Dark Sector, and the Hubble <\/span><span dir=\"ltr\" role=\"presentation\">Constant&#8221;<\/span><\/em><span dir=\"ltr\" role=\"presentation\">, autorul principal al studiului, Francis-Yan Cyr-Racine (de la Departamentul de Fizic\u0103 \u015fi Astronomie \/ Universitatea New Mexico Albuquerque, New Mexico, SUA) \u015fi colegii s\u0103i <\/span>au descoperit o invarian\u021b\u0103 \u00een ceea ce sunt cunoscu\u021bi sub numele de &#8222;parametri f\u0103r\u0103 unitate&#8221;. Cea mai cunoscut\u0103 dintre acestea este constanta de structur\u0103 fin\u0103, care are o valoare de aproximativ 1\/137. Practic, po\u021bi combina parametrii m\u0103sura\u021bi \u00een a\u0219a fel \u00eenc\u00e2t toate unit\u0103\u021bile s\u0103 se anuleze, oferindu-\u021bi acela\u0219i num\u0103r, indiferent de unit\u0103\u021bile pe care le folose\u0219ti. Echipa a descoperit c\u0103 atunci c\u00e2nd se modific\u0103 modelele cosmologice pentru a se potrivi cu ratele de expansiune observate, mai mul\u021bi parametri f\u0103r\u0103 unit\u0103\u021bi r\u0103m\u00e2n la fel, ceea ce sugereaz\u0103 o simetrie cosmic\u0103 subiacent\u0103. Dac\u0103 impune\u021bi aceast\u0103 simetrie mai larg, pute\u021bi scala rata de c\u0103dere liber\u0103 gravita\u021bional\u0103 \u0219i rata de \u00eempr\u0103\u0219tiere foton-electron, astfel \u00eenc\u00e2t diferitele metode de m\u0103surare Hubble s\u0103 fie \u00een armonie. \u0218i dac\u0103 aceast\u0103 invarian\u021b\u0103 este real\u0103, ea implic\u0103 existen\u021ba unui Univers-oglind\u0103. Unul care ar afecta Universul nostru printr-o atrac\u021bie gravita\u021bional\u0103 slab\u0103.<\/p>\n<p><strong>Sursa<\/strong> (traducerea \u015fi adaptarea proprie): studiu \u015ftiin\u0163ific de pe <a href=\"https:\/\/arxiv.org\/pdf\/2107.13000.pdf\" target=\"_blank\" rel=\"noopener\"><strong>arxiv.org<\/strong><\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Ideea unui Univers-oglind\u0103 este \u00eent\u00e2lnit\u0103 \u00een literatura SF. O lume asem\u0103n\u0103toare cu a noastr\u0103, \u00een care ne-am putea g\u0103si &#8222;doppelganger-ul&#8221; (adic\u0103 dublura) sau o versiune a noastr\u0103 este o idee fascinant\u0103. Dar conceptul de Univers-oglind\u0103 a fost adesea studiat \u00een &#8230; <\/p>\n<p class=\"read-more-container\"><a title=\"Un Univers-oglind\u0103 e posibil s\u0103 existe al\u0103turi de Universul nostru &#8211; spune un nou studiu \u015ftiin\u0163ific. Ne-am putea g\u0103si acolo dublura din lumea noastr\u0103?\" class=\"read-more button\" href=\"https:\/\/www.lovendal.ro\/wp52\/un-univers-oglinda-e-posibil-sa-existe-alaturi-de-universul-nostru-spune-un-nou-studiu-stiintific-ne-am-putea-gasi-acolo-dublura-din-lumea-noastra\/#more-80470\" aria-label=\"Cite\u0219te mai multe despre Un Univers-oglind\u0103 e posibil s\u0103 existe al\u0103turi de Universul nostru &#8211; spune un nou studiu \u015ftiin\u0163ific. Ne-am putea g\u0103si acolo dublura din lumea noastr\u0103?\">Cititi mai multe<\/a><\/p>\n","protected":false},"author":1,"featured_media":80471,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[11039],"tags":[13934,344,7396,102,4339,2973,347,2048,4752,435,4724,345,3453,6790,9228,2174,23,2317,1087,9755,2250],"class_list":["post-80470","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-astronomie","tag-albuquerque","tag-antimaterie","tag-astronomi","tag-astronomie","tag-constanta-hubble","tag-cosmologie","tag-electroni","tag-fizician","tag-fotoni","tag-hubble","tag-laborator","tag-materie","tag-new-mexico","tag-particule","tag-radiatia-cosmica-de-fond","tag-sf","tag-sua","tag-supernova","tag-univers","tag-univers-oglinda","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>Un Univers-oglind\u0103 e posibil s\u0103 existe al\u0103turi de Universul nostru - spune un nou studiu \u015ftiin\u0163ific. 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Dar conceptul de Univers-oglind\u0103 a fost adesea studiat \u00een ... 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