Particles from ‘empty’ space observed
Researchers reported observing particles emerging from vacuum fluctuations — essentially seeing something appear from a region previously considered ‘empty’ — which teams say is the strongest evidence yet linking these effects to how mass arises. (x.com) If confirmed, that strengthens experimental access to fundamental questions about mass generation and quantum fields. (x.com)
What physicists call “empty space” is not a blank box. In quantum theory, space behaves more like a restless surface, with tiny energy ripples that can briefly produce particle pairs before they vanish again. (nature.com) Those short-lived pairs are called virtual particles. They are not directly counted by detectors, because they disappear too fast to fly out as ordinary matter. (bnl.gov) The force involved here is the strong force, the one that glues quarks together inside protons and neutrons. Its rule is backwards from gravity in one important way: when quarks are pulled apart, the force between them gets stronger, not weaker. (nature.com) That matters because a lot of the mass in ordinary matter does not come from the bare masses of quarks alone. In quantum chromodynamics, the theory of the strong force, mass also emerges from the energy stored in this violent vacuum and in the confinement of quarks. (nature.com) The new result came from the STAR experiment at the Relativistic Heavy Ion Collider at Brookhaven National Laboratory in New York. The team studied proton-proton collisions and traced what happened to strange quarks produced in the wreckage. (bnl.gov) They did not watch particles pop out of literal nothing in a camera. They measured a fingerprint called spin correlation, which is a shared alignment in the internal angular momentum of two particles, like two coins somehow landing with linked orientations. (bnl.gov) The particles they focused on were Lambda and anti-Lambda hyperons. Those are useful because the spin of a Lambda hyperon closely tracks the spin of its strange quark, which lets the detector read out what the quark pair was doing earlier. (nature.com) In the Nature paper, the STAR collaboration reported evidence that these Lambda and anti-Lambda pairs inherited spin correlations from strange quark and antiquark pairs that existed first as vacuum fluctuations. The measured relative polarization signal was about 18 percent, with an uncertainty of 4 percent. (nature.com) (arxiv.org) The pattern weakened when the two hyperons were far apart in angle. That is exactly what you would expect if the original quantum link fades as the system decoheres during the messy process that turns quarks into detectable particles. (arxiv.org) So the claim is not that physicists made matter from absolutely nothing. The claim is that collisions at the collider gave enough energy to promote quark-antiquark pairs already flickering in the quantum vacuum into real, detectable matter, while preserving a telltale spin pattern from their vacuum origin. (bnl.gov) (phys.org) Nature’s accompanying news article called this one of the clearest experimental routes yet for studying how matter forms from the quantum vacuum. If later measurements confirm it, the result gives physicists a new handle on confinement, the quark condensate, and the part of mass that comes from strong-force dynamics rather than from the Higgs field alone. (nature.com)
