{"id":6445,"date":"2026-11-01T10:43:33","date_gmt":"2026-11-01T15:43:33","guid":{"rendered":"https:\/\/canasanta.ca\/?p=6445"},"modified":"2026-11-01T10:43:33","modified_gmt":"2026-11-01T15:43:33","slug":"una-particula-olvidada-podria-explicar-por-que-existe-el-universo","status":"publish","type":"post","link":"https:\/\/canasanta.ca\/en\/al-dia\/una-particula-olvidada-podria-explicar-por-que-existe-el-universo\/","title":{"rendered":"UNA PART\u00cdCULA OLVIDADA PODR\u00cdA EXPLICAR POR QU\u00c9 EXISTE EL UNIVERSO"},"content":{"rendered":"

Una part\u00edcula que durante a\u00f1os fue tratada como un detalle casi irrelevante de la f\u00edsica podr\u00eda haber desempe\u00f1ado un papel decisivo en una de las preguntas m\u00e1s profundas de la ciencia: por qu\u00e9 existe materia en el universo<\/strong>. Un nuevo an\u00e1lisis de investigadores de la Universidad de Southampton<\/strong> and the Instituto Indio de Tecnolog\u00eda de Kanpur<\/strong> plantea que un neutrino pesado, extremadamente d\u00e9bilmente acoplado, pudo alterar la evoluci\u00f3n del cosmos poco despu\u00e9s del Big Bang.<\/p>\n

EL PROBLEMA DE QUE EXISTA ALGO<\/strong><\/h2>\n

La f\u00edsica moderna tiene un problema inc\u00f3modo. En el universo primitivo, materia y antimateria deber\u00edan haberse producido en cantidades casi iguales. Cuando ambas se encuentran, se aniquilan. Si aquella simetr\u00eda hubiese sido perfecta, pr\u00e1cticamente toda la materia habr\u00eda desaparecido y no existir\u00edan galaxias, estrellas, planetas ni seres humanos.<\/p>\n

Sin embargo, algo rompi\u00f3 el equilibrio. Qued\u00f3 un peque\u00f1o exceso de materia y de ese residuo est\u00e1 hecho todo lo que vemos. Explicar c\u00f3mo surgi\u00f3 esa asimetr\u00eda contin\u00faa siendo uno de los grandes desaf\u00edos de la cosmolog\u00eda y de la f\u00edsica de part\u00edculas.<\/p>\n

EL NEUTRINO QUE CASI NADIE MIRABA<\/strong><\/h2>\n

El trabajo de Rishav Roshan<\/strong> y Sudipta Show<\/strong>, publicado en Physical Review Letters<\/em>, estudia un neutrino pesado de mano derecha que normalmente queda desacoplado en una versi\u00f3n m\u00ednima del llamado mecanismo seesaw<\/em>. Este marco te\u00f3rico intenta explicar por qu\u00e9 los neutrinos conocidos tienen masas extraordinariamente peque\u00f1as.<\/p>\n

Hasta ahora, ese tercer neutrino pesado pod\u00eda considerarse pr\u00e1cticamente irrelevante porque interactuar\u00eda muy poco con las part\u00edculas ordinarias. Los investigadores muestran que precisamente esa debilidad podr\u00eda haber sido su caracter\u00edstica m\u00e1s importante: al decaer extremadamente despacio, habr\u00eda sobrevivido durante suficiente tiempo como para modificar temporalmente la densidad de energ\u00eda y la velocidad de expansi\u00f3n del universo temprano.<\/p>\n

UN UNIVERSO DOMINADO TEMPORALMENTE POR MATERIA<\/strong><\/h2>\n

En el escenario calculado por los cient\u00edficos, el neutrino pesado habr\u00eda llegado a dominar durante un periodo la energ\u00eda del cosmos. Eso producir\u00eda una etapa temprana de dominaci\u00f3n de materia distinta de la historia cosmol\u00f3gica convencional, en la que se supone que el universo de aquella \u00e9poca estaba dominado principalmente por radiaci\u00f3n.<\/p>\n

El cambio no ser\u00eda meramente acad\u00e9mico. Una expansi\u00f3n diferente modifica las temperaturas a las que determinadas interacciones de part\u00edculas alcanzan el equilibrio. Entre ellas est\u00e1n las interacciones de Yukawa de los leptones cargados, relacionadas con el campo de Higgs y esenciales para calcular correctamente procesos capaces de generar la asimetr\u00eda entre materia y antimateria.<\/p>\n

En otras palabras, una part\u00edcula casi invisible podr\u00eda haber cambiado el momento en que se activaron procesos fundamentales del universo primitivo y, con ello, las condiciones bajo las cuales la materia termin\u00f3 imponi\u00e9ndose ligeramente sobre la antimateria.<\/p>\n

NO ES TODAV\u00cdA UNA RESPUESTA DEFINITIVA<\/strong><\/h2>\n

El resultado debe interpretarse con cautela. Los investigadores no han descubierto experimentalmente una nueva part\u00edcula ni han demostrado que este mecanismo sea la explicaci\u00f3n definitiva de nuestra existencia. Se trata de un modelo te\u00f3rico<\/strong> que demuestra que una pieza normalmente descartada del mecanismo seesaw<\/em> puede tener consecuencias cosmol\u00f3gicas mucho mayores de lo que se supon\u00eda.<\/p>\n

La importancia del trabajo est\u00e1 precisamente en que abre una posibilidad comprobable. El escenario afecta no solo a la generaci\u00f3n de la asimetr\u00eda materia-antimateria, sino tambi\u00e9n a la producci\u00f3n de materia oscura y a la evoluci\u00f3n de ondas gravitacionales primordiales.<\/p>\n

LAS ONDAS GRAVITACIONALES PODR\u00cdAN DELATARLO<\/strong><\/h2>\n

Una etapa an\u00f3mala en la expansi\u00f3n del universo temprano podr\u00eda haber dejado huellas en el espectro de ondas gravitacionales primordiales<\/strong>. Los autores se\u00f1alan que futuras observaciones de estas se\u00f1ales, combinadas con mediciones de oscilaciones de neutrinos, podr\u00edan poner a prueba partes del escenario.<\/p>\n

Eso convierte la propuesta en algo m\u00e1s interesante que una simple especulaci\u00f3n filos\u00f3fica. La pregunta \u00ab\u00bfpor qu\u00e9 existe algo en lugar de nada?\u00bb contin\u00faa siendo enorme, pero aqu\u00ed adquiere una formulaci\u00f3n f\u00edsica concreta: qu\u00e9 ocurri\u00f3 con las part\u00edculas y la expansi\u00f3n del cosmos cuando el universo era extremadamente joven.<\/p>\n

UNA PIEZA PEQUE\u00d1A PARA UNA PREGUNTA ENORME<\/strong><\/h2>\n

La paradoja resulta fascinante. Una part\u00edcula hipot\u00e9tica ignorada precisamente porque casi no interact\u00faa con nada podr\u00eda haber tenido tiempo suficiente para dominar una etapa de la historia c\u00f3smica. Y esa breve intervenci\u00f3n habr\u00eda podido alterar el mecanismo que permiti\u00f3 que sobreviviera la materia.<\/p>\n

No sabemos todav\u00eda si ese neutrino pesado existi\u00f3 en las condiciones propuestas. Pero el estudio recuerda algo fundamental de la ciencia: a veces lo que parece demasiado d\u00e9bil para importar puede cambiar por completo la historia cuando se le concede suficiente tiempo.<\/p>","protected":false},"excerpt":{"rendered":"

Una part\u00edcula que durante a\u00f1os fue tratada como un detalle casi irrelevante de la f\u00edsica podr\u00eda haber desempe\u00f1ado un papel decisivo en una de las preguntas m\u00e1s profundas de la ciencia: por qu\u00e9 existe materia en el universo. Un nuevo an\u00e1lisis de investigadores de la Universidad de Southampton y el Instituto Indio de Tecnolog\u00eda de […]<\/p>\n","protected":false},"author":284226809,"featured_media":6446,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_wpcom_ai_launchpad_first_post":false,"_jetpack_hide_featured_image":false,"_jetpack_featured_image_duplicate_dismissed":0,"_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":[33205457,3213,33205423],"tags":[33205475,33208253,33206677,33205989,33207452,33208252,33206716,33208251],"class_list":["post-6445","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-al-dia","category-ciencia","category-cosmos","tag-antimateria","tag-asimetria-materia-antimateria","tag-big-bang","tag-cosmologia","tag-materia-oscura","tag-neutrino-pesado","tag-neutrinos","tag-ondas-gravitacionales-primordiales"],"acf":{"introduccion":"","fuentes_y_referencias":"University of Southampton \/ ScienceDaily \u2014 Scientists say a forgotten particle may explain why the universe exists (1 noviembre 2026): https:\/\/www.sciencedaily.com\/releases\/2026\/10\/261031221201.htm\\nPhysical Review Letters \u2014 Rishav Roshan y Sudipta Show, Delayed Charged Lepton Yukawa Equilibration in Minimal Seesaw, Vol. 137, 111802 (8 septiembre 2026): https:\/\/doi.org\/10.1103\/nfkx-q6z7\\nPubMed \u2014 Delayed Charged Lepton Yukawa Equilibration in Minimal Seesaw, PMID 42789908: https:\/\/pubmed.ncbi.nlm.nih.gov\/42789908\/\\nImagen destacada: Time Projection Chamber (TPC) del experimento T2K. Autora: Marina Cavazza \/ CERN. Licencia CC BY 4.0. 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