Gluon Junction May Carry Proton’s Baryon Number
Data from the STAR detector at Brookhaven’s Relativistic Heavy Ion Collider, analyzed in a study published in Science and reported 16 August 2026, indicate that a Y-shaped junction of gluons—not the three valence quarks—primarily carries and conserves baryon number inside protons. In high-energy nuclear collisions, excess baryons appear perpendicular to the beam far more often than electric-charge measurements of stopped quarks can explain, matching predictions that the slower gluon junction stops and converts into new baryons while quarks continue forward. This challenges the textbook picture in which each valence quark holds one-third of the proton’s baryon number of +1.
The baryon junction concept dates to the 1970s as a description of how gluons bind quarks; in 1996 theorists proposed it as the actual carrier of baryon number. RHIC collisions, which convert nearly all energy into thousands of new particles, provided the first clear experimental test by comparing net baryon yields with charge redistribution across collision systems. Baryon-number conservation underpins proton stability (lifetime longer than the age of the universe) and the matter-antimatter asymmetry observed since the Big Bang.
Uncertainties remain over whether the junction fully accounts for all excess or if additional QCD effects contribute; confirmation will require independent analyses and data from future facilities such as the Electron-Ion Collider. Models must now incorporate a more dynamic gluon structure when describing proton identity under extreme conditions.
Sources: ScienceDaily, Brookhaven National Laboratory, *Science.
JWST Reveals Candidate “Black Hole Star”
Astronomers using the James Webb Space Telescope have identified an extremely bright red object in the early universe, only a few hundred million years after the Big Bang, that appears to be a new class of source: a black hole star. Reported 16 August 2026 and published in Nature, the object (MoM-BH*-1) is roughly solar-system sized yet radiates ~100 billion times more energy than any ordinary star can produce via fusion, consistent with a central black hole of about 100,000 solar masses embedded in a dense hydrogen envelope.
The source was found in the “Mirage or Miracle” survey targeting the earliest galaxies. Its spectrum shows an exceptionally deep Balmer break, almost pure hydrogen-helium composition, and no dust signature that would normally redden light. Simulations matching the observed brightness and spectral features favor an accreting black hole powering a star-like gas cocoon rather than a conventional galaxy or star.
Key open questions include whether this object is unique or representative of the numerous “little red dots” seen across JWST deep fields, and how such systems evolve or disappear by the present day. Further spectroscopy and multi-wavelength follow-up are needed to confirm the black-hole mass and envelope dynamics and to test if black hole stars explain a significant fraction of early-universe luminosity.
Sources: Phys.org, MIT, *Nature.
Cavendish Test Proposed for Millicharged Particles
Theoretical work published in Physical Review Letters and covered 16 August 2026 shows that a modern version of the centuries-old Cavendish experiment could detect or tightly constrain millicharged particles—hypothetical particles carrying a tiny fraction of the electron’s charge. Researchers at Fermilab, Stanford and the University of Delaware project that an oscillating Faraday-cage setup could reach sensitivities more than three orders of magnitude beyond current or planned accelerator searches in the MeV–GeV range, and could probe millicharged dark-matter fractions below one part in a trillion.
Millicharged particles are among the simplest Standard Model extensions and could form a dark-matter subcomponent or accumulate from cosmic-ray production. In the proposed apparatus, such particles would penetrate the conductive shell and generate a detectable oscillating electric field when the cage potential is driven, violating Gauss’s law in a manner distinguishable from ordinary charges. The same geometry historically limited the photon mass.
Practical realization depends on achieving sufficiently low backgrounds and precise field measurements; a prototype is under discussion. If successful, the method would open a low-cost, table-top route complementary to colliders for a long-elusive sector of particle physics.
Sources: Phys.org, *Physical Review Letters.