Philosopher Suggests Grouping Neutrinos as States of One Entity at Physics Foundations Meeting

George Hobart of the University of Bristol presented an argument for redefining how particles are grouped in the standard model of particle physics at the Foundations of Physics conference in Irvine, California, on 17 June. Hobart said the model’s current rows and columns, organized by mass and flavor, create an inconsistency because electron neutrinos can change into muon neutrinos while electrons, muons, and taus show no such spontaneous transitions.

He proposed treating the three neutrinos as quantum states of one more fundamental entity and grouping particles into families or entire rows instead of treating each particle as a separate building block.

@NewScientist reported that Hobart presented the work as a philosophical adjustment that leaves existing physics unchanged but could guide new lines of inquiry by focusing first on what the neutrinos share. He noted that the standard model cannot predict neutrino mass through the Higgs mechanism used for other particles and that neutrinos interact only weakly through gravity or the weak nuclear force.

Noel Swanson of the University of Delaware said the standard model’s particle categories rest on idealizations still under debate among philosophers.

Swanson added that at a deeper level the entities resemble excitations of fields rather than fundamental joints of nature, making proposals like Hobart’s worth examining even if mass and flavor are unlikely to remain the most basic properties. Hobart said the discussion could help researchers decide which experimental directions to pursue next.