CERN dezvăluie mistere ale Universului: Ce se ascunde dincolo de Modelul Standard?

ActualitateCERN dezvăluie mistere ale Universului: Ce se ascunde dincolo de Modelul Standard?
A team of astronomers has announced the discovery of the most distant black hole ever confirmed, formed just 500 million years after the Big Bang, when the universe was only 3% of its current age. The breakthrough, led by the Cosmic Frontier Center at The University of Texas at Austin, offers a rare opportunity to study one of the most mysterious periods in the cosmos. “When looking for black holes, this is about as far back as you can practically go. We’re really pushing the boundaries of what current technology can detect,” said Anthony Taylor, a postdoctoral researcher at the Cosmic Frontier Center and lead of the team behind the discovery. The findings were published on August 6 in The Astrophysical Journal Letters. While a few potential black holes have been identified at greater distances, none have provided the crucial spectroscopic signature needed for confirmation. “While astronomers have found a few, more distant candidates,” said Steven Finkelstein, co-author and director of the Cosmic Frontier Center, “they have yet to find the distinct spectroscopic signature associated with a black hole.” Spectroscopy, a technique that splits light into its component wavelengths, is essential for identifying black holes. Researchers look for signs of fast-moving gas swirling into the black hole. Gas moving away from us appears redder, while gas moving towards us appears bluer. Taylor explains, “There aren’t many other things that create this signature. And this galaxy has it!” The team used data from the James Webb Space Telescope’s CAPERS (CANDELS-Area Prism Epoch of Reionization Survey) program, designed to expand the limits of space observation. Launched in 2021, the JWST offers unprecedented views of deep space, with CAPERS focusing on the farthest reaches of the universe. “The first goal of CAPERS is to confirm and study the most distant galaxies,” said Mark Dickinson, a co-author on the paper and the CAPERS team lead. “JWST spectroscopy is the key to confirming their distances and understanding their physical properties.” What initially appeared as a faint speck in the images, CAPERS-LRD-z9, turned out to be part of a newly identified class of galaxies dubbed “Little Red Dots.” These compact, red, and unexpectedly bright galaxies only existed during the first 1.5 billion years of the universe. “The discovery of Little Red Dots was a major surprise from early JWST data, as they looked nothing like galaxies seen with the Hubble Space Telescope,” said Finkelstein. “Now, we’re in the process of figuring out what they’re like and how they came to be.” CAPERS-LRD-z9 is crucial for understanding these peculiar galaxies. It supports growing evidence that supermassive black holes are responsible for their unusual brightness, which would typically indicate a high abundance of stars. However, this contradicts what we know about star formation in the early universe. The brightness may instead be due to intense radiation from a black hole. The galaxy’s red hue is also likely the result of a thick cloud of gas surrounding the black hole. “We’ve seen these clouds in other galaxies,” Taylor said. “When we compared this object to those other sources, it was a dead ringer.” Even more striking is the size of the black hole at the centre of CAPERS-LRD-z9, which could be as large as 300 million times the mass of our sun, making it one of the largest known black holes, especially for such an early period in the universe’s history. Its mass is so substantial that it accounts for half the total mass of stars in its galaxy. “This adds to growing evidence that early black holes grew much faster than we thought possible,” Finkelstein said. “Or they started out far more massive than our models predict.” The team is now focused on obtaining higher-resolution data from the James Webb Space Telescope to further investigate this ancient cosmic object. “This is a good test object for us,” Taylor concluded. “We haven’t been able to study early black hole evolution until recently, and we are excited to see what we can learn from this unique object.” Featuring: Artist representation of CAPERS-LRD-z9, home to the earliest confirmed black hole. The supermassive black hole at its center is believed to be surrounded by a thick cloud of gas, giving the galaxy a distinctive red colour. When: 12 Aug 2025 Credit: Erik Zumalt/The University of Texas at Austin/INSTARimages **EDITORIAL USE ONLY. MATERIALS ONLY TO BE USED IN CONJUNCTION WITH EDITORIAL STORY. THE USE OF THESE MATERIALS FOR ADVERTISING, MARKETING OR ANY OTHER COMMERCIAL PURPOSE IS STRICTLY PROHIBITED. MATERIAL COPYRIGHT REMAINS WITH STATED PHOTOGRAPHER AND/OR SUPPLIER.**,Image: 1029009612, License: Rights-managed, Restrictions: EDITORIAL USE ONLY. MATERIALS ONLY TO BE USED IN CONJUNCTION WITH EDITORIAL STORY. THE USE OF THESE MATERIALS FOR ADVERTISING, MARKETING OR ANY OTHER COMMERCIAL PURPOSE IS STRICTLY PROHIBITED. MATERIAL COPYRIGHT REMAINS WITH STATED PHOTOGRAPHER AND/OR SUPP, Model Release: no
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CERN și Descoperirea Particulelor: Ce Indicii Ne Oferă

Introducere: Fizicienii de la CERN au descoperit un comportament neobișnuit al particulelor subatomice, care ar putea indica existența unei fizici dincolo de Modelul Standard, teoria actuală a particulelor fundamentale.

Ce este / despre ce e vorba

În acceleratorul de particule de la granița dintre Elveția și Franța, cercetătorii au observat comportamente ale mezonilor B care nu se aliniază cu predicțiile Modelului Standard. Acest model explică interacțiunile fundamentale ale Universului, dar cercetătorii au identificat o abatere semnificativă în rezultatele experimentului LHCb.

De ce este important

Descoperirile de la CERN sunt relevante deoarece Modelul Standard este considerat una dintre cele mai de succes teorii ale științei. Însă, această teorie nu reușește să explice gravitația, materia întunecată și energia întunecată, care constituie 95% din Univers. Astfel, rezultatele actuale ar putea sugera existența unor forțe sau particule necunoscute, care ar putea schimba înțelegerea noastră despre univers.

Detalii și exemple

  • Analiza transformărilor rare ale mezonilor B a arătat abateri de patru deviații standard.
  • Numai unul dintr-un milion de mezoni B suferă o dezintegrare de tip „pinguin”.
  • Pentru a fi considerată o descoperire oficială, este necesară atingerea pragului de cinci sigma.

Întrebări frecvente

  • Ce înseamnă abaterile observate? Abaterile sugerează posibilele influențe ale unor particule sau forțe necunoscute.
  • Cine este implicat în aceste cercetări? Cercetătorii de la CERN, în special echipa experimentului LHCb.
  • Ce urmează în cercetările de la CERN? Continuarea măsurărilor și observațiilor pentru a verifica aceste rezultate și a atinge pragul necesar pentru o descoperire oficială.

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