{"id":294313,"date":"2026-06-22T23:16:55","date_gmt":"2026-06-22T23:16:55","guid":{"rendered":"http:\/\/6a3570669f34d67ddfa7012b"},"modified":"2026-06-22T23:16:55","modified_gmt":"2026-06-22T23:16:55","slug":"el-tiempo-es-una-ilusion-este-experimento-con-un-miniuniverso-profundiza-en-ello","status":"publish","type":"post","link":"https:\/\/sarmiento24h.com\/?p=294313","title":{"rendered":"\u00bfEl tiempo es una ilusi\u00f3n? Este experimento con un \u201cminiuniverso\u201d profundiza en ello"},"content":{"rendered":"<p>Un f\u00edsico construy\u00f3 un peque\u00f1o universo de laboratorio para investigar una de las preguntas m\u00e1s inquietantes acerca de la gravedad cu\u00e1ntica: si el tiempo es una propiedad fundamental de la realidad o una consecuencia de los cambios que ocurren dentro de ella.<\/p>\n<p>El experimento de Giovanni Barontini, profesor de F\u00edsica de la Universidad de Birmingham, muestra que un sistema aislado puede ordenarse con un reloj que surge de sus propios cambios internos. El resultado ofrece una plataforma experimental para poner a prueba algunas de las ideas m\u00e1s influyentes sobre el origen del tiempo en gravedad cu\u00e1ntica.<\/p>\n<h2>Dos clases de tiempo y ninguno es el que crees<\/h2>\n<p>Para la mayor\u00eda de las personas, el tiempo es evidente. Es una corriente en la que fluimos y que siempre avanza de <a href=\"https:\/\/es.wired.com\/articulos\/ayer-y-manana-son-lo-mismo-para-la-fisica-y-acaban-de-encontrar-otra-prueba-de-ello\">ayer hacia ma\u00f1ana<\/a>, como una flecha en l\u00ednea recta. Lo percibimos constantemente porque marca fen\u00f3menos irreversibles, como la vida y la muerte. Este tiempo es, ante todo, una experiencia mental.<\/p>\n<p>En f\u00edsica, el tiempo resulta mucho m\u00e1s extra\u00f1o. A escala c\u00f3smica, forma parte de la estructura misma de la realidad. Seg\u00fan la teor\u00eda de la relatividad, convive con el espacio y, al igual que \u00e9l, se deforma bajo la influencia de la materia y la energ\u00eda. Act\u00faa como el marco que ordena los acontecimientos y permite distinguir qu\u00e9 ocurri\u00f3 antes y qu\u00e9 ocurri\u00f3 despu\u00e9s.<\/p>\n<p>Sin embargo, cuando los f\u00edsicos intentan describir el universo completo mediante <a href=\"https:\/\/es.wired.com\/articulos\/crean-la-superposicion-cuantica-mas-grande-jamas-observada-miles-de-atomos-desafian-el-limite-entre-lo-grande-y-lo-pequeno\">teor\u00edas cu\u00e1nticas<\/a> de la gravedad, el tiempo parece desaparecer de las ecuaciones. Los cambios siguen ocurriendo, pero ning\u00fan reloj externo indica cu\u00e1ndo suceden. Algunos investigadores incluso proponen que la evoluci\u00f3n de la entrop\u00eda podr\u00eda ordenar esos cambios.<\/p>\n<p>Ambas visiones parecen contradictorias y, aun as\u00ed, describen con gran precisi\u00f3n los fen\u00f3menos que observamos. Esta tensi\u00f3n entre lo cu\u00e1ntico y lo relativista ha llevado a algunos f\u00edsicos a plantear la inquietante posibilidad de que <strong>quiz\u00e1 el tiempo no sea una propiedad fundamental del universo, sino una consecuencia de c\u00f3mo cambian las cosas.<\/strong><\/p>\n<hr>\n<div class=\"ContentCardEmbedWrapper-hkvhYu kMYDit content-card-embed content-card-embed--stacked\" data-testid=\"ContentCardEmbedWrapper\" readability=\"19.55625\">\n<div class=\"ContentCardEmbedImage-bqahne fjmzkP content-card-embed__image\" data-testid=\"ContentCardEmbedImage\"><span class=\"SpanWrapper-kFnjvc eKnjjD responsive-asset\"><picture class=\"ResponsiveImagePicture-jKunQM gjCCFj responsive-image\"><img decoding=\"async\" alt=\"universo\" loading=\"lazy\" class=\"ResponsiveImageContainer-dkeESL cQPiWi responsive-image__image\" srcset=\"https:\/\/media.es.wired.com\/photos\/6a2c5bda281f3ad4e5a57265\/master\/w_120,c_limit\/Hubble_NGC7722_potm2601b.jpeg 120w, https:\/\/media.es.wired.com\/photos\/6a2c5bda281f3ad4e5a57265\/master\/w_240,c_limit\/Hubble_NGC7722_potm2601b.jpeg 240w, https:\/\/media.es.wired.com\/photos\/6a2c5bda281f3ad4e5a57265\/master\/w_320,c_limit\/Hubble_NGC7722_potm2601b.jpeg 320w, https:\/\/media.es.wired.com\/photos\/6a2c5bda281f3ad4e5a57265\/master\/w_640,c_limit\/Hubble_NGC7722_potm2601b.jpeg 640w\" sizes=\"100vw\" src=\"https:\/\/media.es.wired.com\/photos\/6a2c5bda281f3ad4e5a57265\/master\/w_775%2Cc_limit\/Hubble_NGC7722_potm2601b.jpeg\"><\/picture><\/span><\/div>\n<div class=\"ContentCardEmbedInfo-buyHWH gWLOee\" readability=\"20.4875\">\n<div class=\"BaseText-fEwdHD ContentCardEmbedHed-kDKGDs fUtEc dlHXUJ content-card-embed__hed\" data-testid=\"ContentCardEmbedHed\"><a class=\"BaseLink-haTOKm ContentCardEmbedHedLink-iBZsco gAoKdC hhUFQU content-card-embed__hed-link link\" href=\"https:\/\/es.wired.com\/articulos\/el-universo-no-esta-desacelerando-breve-historia-de-una-crisis-nerviosa-entre-cosmologos\" data-testid=\"ContentCardEmbedHedLink\">El universo no est\u00e1 desacelerando: breve historia de una crisis nerviosa entre cosm\u00f3logos<\/a><\/div>\n<p>La idea de que la expansi\u00f3n del universo podr\u00eda estar fren\u00e1ndose provoc\u00f3 alarma entre los cosm\u00f3logos. Un nuevo estudio concluye que no era as\u00ed.<\/p>\n<\/div>\n<\/div>\n<hr>\n<h2>Un reloj hecho de entrop\u00eda<\/h2>\n<p>Para poner a prueba esa idea, Barontini cre\u00f3 una especie de universo en miniatura utilizando un condensado de Bose-Einstein formado por 24,000 \u00e1tomos ultrafr\u00edos. En este peculiar estado de la materia, los \u00e1tomos act\u00faan como una \u00fanica entidad cu\u00e1ntica. Los investigadores describen el sistema como un \u201cminiuniverso\u201d porque permanece pr\u00e1cticamente aislado, evoluciona por s\u00ed mismo y se divide en una regi\u00f3n observable y otra oculta.<\/p>\n<figure class=\"AssetEmbedWrapper-iJvQnD cOWUYC asset-embed\">\n<div class=\"AssetEmbedAssetContainer-fnduJP iaVSwI asset-embed__asset-container\"><span class=\"SpanWrapper-kFnjvc eKnjjD responsive-asset AssetEmbedResponsiveAsset-gaAbQ hXaxHA asset-embed__responsive-asset\"><picture class=\"ResponsiveImagePicture-jKunQM gjCCFj AssetEmbedResponsiveAsset-gaAbQ hXaxHA asset-embed__responsive-asset responsive-image\"><img decoding=\"async\" alt=\"En este peque\u00f1o instrumento est el miniuniverso con 24000 tomos ultrafr\u00edos.\" loading=\"lazy\" class=\"ResponsiveImageContainer-dkeESL cQPiWi responsive-image__image\" srcset=\"https:\/\/media.es.wired.com\/photos\/6a3582d1806aa7955c872301\/master\/w_120,c_limit\/mini-universe-equipment.x63adcf03.jpg.jpg 120w, https:\/\/media.es.wired.com\/photos\/6a3582d1806aa7955c872301\/master\/w_240,c_limit\/mini-universe-equipment.x63adcf03.jpg.jpg 240w, https:\/\/media.es.wired.com\/photos\/6a3582d1806aa7955c872301\/master\/w_320,c_limit\/mini-universe-equipment.x63adcf03.jpg.jpg 320w, https:\/\/media.es.wired.com\/photos\/6a3582d1806aa7955c872301\/master\/w_640,c_limit\/mini-universe-equipment.x63adcf03.jpg.jpg 640w, https:\/\/media.es.wired.com\/photos\/6a3582d1806aa7955c872301\/master\/w_960,c_limit\/mini-universe-equipment.x63adcf03.jpg.jpg 960w, https:\/\/media.es.wired.com\/photos\/6a3582d1806aa7955c872301\/master\/w_1280,c_limit\/mini-universe-equipment.x63adcf03.jpg.jpg 1280w, https:\/\/media.es.wired.com\/photos\/6a3582d1806aa7955c872301\/master\/w_1600,c_limit\/mini-universe-equipment.x63adcf03.jpg.jpg 1600w\" sizes=\"100vw\" src=\"https:\/\/media.es.wired.com\/photos\/6a3582d1806aa7955c872301\/master\/w_1600%2Cc_limit\/mini-universe-equipment.x63adcf03.jpg.jpg\"><\/picture><\/span><\/div>\n<div class=\"CaptionWrapper-bpPcvW iDPSlt caption AssetEmbedCaption-eZIMNW gMgneI asset-embed__caption\" data-testid=\"caption-wrapper\" readability=\"6.5\"><span class=\"BaseText-fEwdHD CaptionText-cQpRdU kRTNAB hbiMYj caption__text\" readability=\"28\"><\/p>\n<p>En este peque\u00f1o instrumento est\u00e1 el miniuniverso con 24,000 \u00e1tomos ultrafr\u00edos.<\/p>\n<p><\/span><span class=\"BaseText-fEwdHD CaptionCredit-cUgOGk iQbGEh hRFzlA caption__credit\">University of Birmingham.<\/span><\/div>\n<\/figure>\n<p>Mientras los \u00e1tomos pasaban de una regi\u00f3n a otra, la entrop\u00eda tambi\u00e9n cambiaba. En lugar de medir la evoluci\u00f3n del sistema con un reloj externo, Barontini intent\u00f3 ordenar los acontecimientos utilizando \u00fanicamente esos cambios internos. El experimento mostr\u00f3 que el sistema pod\u00eda construir una noci\u00f3n coherente de tiempo a partir del intercambio de entrop\u00eda entre sus distintas regiones. A medida que los \u00e1tomos se mov\u00edan entre el sector observable y el oculto, Barontini defini\u00f3 un \u201ctiempo entr\u00f3pico\u201d a partir de los cambios en la entrop\u00eda de grano grueso del sector observable.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Un f\u00edsico construy\u00f3 un peque\u00f1o universo de&#46;&#46;&#46;<\/p>\n","protected":false},"author":1,"featured_media":294314,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_feature_clip_id":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2},"jetpack_post_was_ever_published":false},"categories":[46],"tags":[],"class_list":["post-294313","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-tecnologia"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.9 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>\u00bfEl tiempo es una ilusi\u00f3n? 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