The result “leaves us with the question of what is out there.”
to a record level of exactness, physicists report in the July 7That near-perfect roundness deepens the mystery behind how the universe came to be filled with matter as opposed to its counterpart, antimatter. Any asymmetry in the electron’s shape, namely the distribution of the particle’s electric charge, would point to a related asymmetry in the laws of nature, one that could explain this feature of the cosmos.
To gauge the particle’s shape, Roussy and colleagues looked at whether electrons pivoted in an electric field. If electrons weren’t round but slightly egg-shaped, an electric field would exert a torque on them, much as gravity topples an egg standing on its end. At their most basic level, electrons are pointlike particles, without a definite size and shape. But in quantum field theory, electrons can be thought of as surrounded by temporary “virtual” particles that pop in and out of existence, giving each electron a spherical halo of electric charge. If that halo were found to be just slightly egg-shaped, that could point to how the universe became lopsided toward matter.
. If those particles exist, they would also transiently appear and disappear around the electron, in such a way as to make it oblong.
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