{"id":101167,"date":"2025-12-28T11:37:39","date_gmt":"2025-12-28T09:37:39","guid":{"rendered":"https:\/\/www.lovendal.ro\/wp52\/?p=101167"},"modified":"2025-12-28T11:37:39","modified_gmt":"2025-12-28T09:37:39","slug":"cercetatorii-au-inversat-undele-electromagnetice-in-timp-nu-este-sf-ci-un-experiment-real-care-pune-la-indoiala-ceea-ce-stim-despre-fizica","status":"publish","type":"post","link":"https:\/\/www.lovendal.ro\/wp52\/cercetatorii-au-inversat-undele-electromagnetice-in-timp-nu-este-sf-ci-un-experiment-real-care-pune-la-indoiala-ceea-ce-stim-despre-fizica\/","title":{"rendered":"Cercet\u0103torii au inversat undele electromagnetice \u00een timp: nu este SF, ci un experiment real care pune la \u00eendoial\u0103 ceea ce \u0219tim despre fizic\u0103"},"content":{"rendered":"<p><a href=\"https:\/\/www.lovendal.ro\/wp52\/wp-content\/uploads\/2025\/12\/unde-electromagnetice.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"alignleft size-full wp-image-101168\" src=\"https:\/\/www.lovendal.ro\/wp52\/wp-content\/uploads\/2025\/12\/unde-electromagnetice.jpg\" alt=\"\" width=\"362\" height=\"240\" srcset=\"https:\/\/www.lovendal.ro\/wp52\/wp-content\/uploads\/2025\/12\/unde-electromagnetice.jpg 362w, https:\/\/www.lovendal.ro\/wp52\/wp-content\/uploads\/2025\/12\/unde-electromagnetice-300x199.jpg 300w\" sizes=\"auto, (max-width: 362px) 100vw, 362px\" \/><\/a>Fizicienii au inversat experimental undele electromagnetice \u00een timp, confirm\u00e2nd o predic\u021bie teoretic\u0103 care a fost valabil\u0103 timp de decenii. Procesul, cunoscut sub numele de <strong>reflexie temporal\u0103<\/strong>, face ca o und\u0103 s\u0103 \u00ee\u0219i retrag\u0103 traiectoria \u00eenapoi prin timp \u015fi nu prin spa\u021biu. Experimentul &#8211; condus de <strong>Hady Moussa<\/strong> la <strong>Centrul de Cercetare \u0218tiin\u021bific\u0103 Avansat\u0103<\/strong> (<strong>CUNY ASRC<\/strong>) al Universit\u0103\u021bii din New York, a produs prima observa\u021bie clar\u0103 \u0219i repetabil\u0103 a acestui efect. \u00cen loc s\u0103 interfereze cu timpul \u00een sine, inversarea are loc din cauza unei schimb\u0103ri bru\u0219te a condi\u021biilor fizice ale mediului undei. Atunci c\u00e2nd aceste condi\u021bii sunt controlate cu precizie, o por\u021biune a undei se reflect\u0103 \u00eenapoi \u00een timp, form\u00e2nd o copie inversat\u0103 a semnalului original.<\/p>\n<p>Pentru a realiza acest lucru, echipa de cercetare a proiectat un metamaterial pentru linie de transmisie, realizat dintr-o band\u0103 metalic\u0103 \u00eencorporat\u0103 cu comutatoare electronice de mare vitez\u0103. Aceste comutatoare au fost conectate la baterii de condensatoare \u0219i au permis modific\u0103ri aproape instantanee ale propriet\u0103\u021bilor electromagnetice ale materialului. \u00centr-un moment critic, echipa a declan\u0219at o dublare rapid\u0103 a impedan\u021bei, care se refer\u0103 la rezisten\u021ba sa la curentul electric. Aceasta a creat ceea ce cercet\u0103torii descriu ca o limit\u0103 temporal\u0103. C\u00e2nd unda a \u00eent\u00e2mpinat aceast\u0103 schimbare brusc\u0103, o parte din ea s-a inversat \u00een timp.<\/p>\n<p>Aceast\u0103 reflexie este fundamental diferit\u0103 de cea spa\u021bial\u0103 observat\u0103 \u00een oglinzi. Aici, inversarea are loc din cauza unei modific\u0103ri inginere\u0219ti a propriet\u0103\u021bilor materialului \u00een timp, nu pentru c\u0103 unda rico\u0219eaz\u0103 de o suprafa\u021b\u0103.<\/p>\n<p>Ideea reflexiei \u00een timp exist\u0103 \u00een fizica teoretic\u0103 de mai bine de o jum\u0103tate de secol. Modelele sugerau c\u0103, atunci c\u00e2nd o und\u0103 experimenteaz\u0103 o schimbare brusc\u0103 \u00een mediul s\u0103u, aceasta s-ar putea reflecta \u00een timp, mai degrab\u0103 dec\u00e2t \u00een \u200b\u200bspa\u021biu. P\u00e2n\u0103 acum, niciun experiment nu demonstrase pe deplin acest efect. O provocare major\u0103 a fost ob\u021binerea deplas\u0103rii temporale bru\u0219te \u0219i uniforme necesare pentru a produce reflexii curate. Prin coordonarea precis\u0103 a componentelor de comutare, echipa CUNY a creat un mediu \u00een care efectul putea ap\u0103rea \u00een condi\u021bii repetabile.<\/p>\n<p>Experimentul nu implic\u0103 o inversare a timpului \u00een sine. Unda reflectat\u0103 se deplaseaz\u0103 \u00eenapoi \u00een cadrul sistemului datorit\u0103 condi\u021biilor proiectate, dar timpul din afara sistemului continu\u0103 normal. Ceea ce s-a schimbat este modul \u00een care oamenii de \u0219tiin\u021b\u0103 pot influen\u021ba direc\u021bia undei folosind modula\u021bia temporal\u0103. Aceast\u0103 tehnic\u0103 adaug\u0103 un nou instrument puternic pentru gestionarea fluxului de energie, \u00eembun\u0103t\u0103\u021birea controlului undelor \u0219i construirea de sisteme reconfigurabile. Capacitatea de a reflecta o und\u0103 \u00een timp extinde gama de comportamente posibile care pot fi integrate \u00een sistemele electromagnetice.<\/p>\n<p><strong>Sursa:<\/strong> studiul \u015ftiin\u0163ific <a href=\"https:\/\/www.nature.com\/articles\/s41567-023-01975-y\" target=\"_blank\" rel=\"noopener\"><strong>&#8222;Observation of temporal reflection and broadband frequency translation at photonic time interfaces&#8221; \/ nature.com<\/strong><\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Fizicienii au inversat experimental undele electromagnetice \u00een timp, confirm\u00e2nd o predic\u021bie teoretic\u0103 care a fost valabil\u0103 timp de decenii. Procesul, cunoscut sub numele de reflexie temporal\u0103, face ca o und\u0103 s\u0103 \u00ee\u0219i retrag\u0103 traiectoria \u00eenapoi prin timp \u015fi nu prin &#8230; <\/p>\n<p class=\"read-more-container\"><a title=\"Cercet\u0103torii au inversat undele electromagnetice \u00een timp: nu este SF, ci un experiment real care pune la \u00eendoial\u0103 ceea ce \u0219tim despre fizic\u0103\" class=\"read-more button\" href=\"https:\/\/www.lovendal.ro\/wp52\/cercetatorii-au-inversat-undele-electromagnetice-in-timp-nu-este-sf-ci-un-experiment-real-care-pune-la-indoiala-ceea-ce-stim-despre-fizica\/#more-101167\" aria-label=\"Cite\u0219te mai multe despre Cercet\u0103torii au inversat undele electromagnetice \u00een timp: nu este SF, ci un experiment real care pune la \u00eendoial\u0103 ceea ce \u0219tim despre fizic\u0103\">Cititi mai multe<\/a><\/p>\n","protected":false},"author":1,"featured_media":101168,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[11042],"tags":[11043,9786,525,2174,2501,789,10071],"class_list":["post-101167","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-fizica-chimie","tag-fizica-chimie","tag-fizicieni","tag-new-york","tag-sf","tag-spatiu","tag-timp","tag-unde-electromagnetice","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>Cercet\u0103torii au inversat undele electromagnetice \u00een timp: nu este SF, ci un experiment real care pune la \u00eendoial\u0103 ceea ce \u0219tim despre fizic\u0103 - 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\/cercetatorii-au-inversat-undele-electromagnetice-in-timp-nu-este-sf-ci-un-experiment-real-care-pune-la-indoiala-ceea-ce-stim-despre-fizica\/\" \/>\n<meta property=\"og:locale\" content=\"ro_RO\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Cercet\u0103torii au inversat undele electromagnetice \u00een timp: nu este SF, ci un experiment real care pune la \u00eendoial\u0103 ceea ce \u0219tim despre fizic\u0103\" \/>\n<meta property=\"og:description\" content=\"Fizicienii au inversat experimental undele electromagnetice \u00een timp, confirm\u00e2nd o predic\u021bie teoretic\u0103 care a fost valabil\u0103 timp de decenii. 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Procesul, cunoscut sub numele de reflexie temporal\u0103, face ca o und\u0103 s\u0103 \u00ee\u0219i retrag\u0103 traiectoria \u00eenapoi prin timp \u015fi nu prin ... 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