Crossing into a mirror world: Particles turn to wisps of fog, and the magnetic monopole paradox dissolves
In Goethe's ballad "Erlkönig," immortalized in Schubert's fevered 1815 setting, a dying boy riding through the night sees a spectral king beckoning from the darkness. His father calms him: "Mein Sohn, es ist ein Nebelstreif"—my son, it is only a wisp of fog. In the poem, the father's reassurance proves tragically wrong. In the quantum world, however, his words acquire an uncanny new meaning.
This article explores a quantum physics phenomenon where particles appear to vanish when interacting with a magnetic monopole, but a new study demonstrates that they actually pass through the magnetic monopole and reappear as nonlocal objects. The research, conducted by physicists from Ghent University, the University of Cambridge, and the University of Oxford, resolves a longstanding puzzle in high-energy physics.
By simulating the process using a chain of quantum spins on a computer, the study shows that the particle is never reflected and instead emerges as a twisted, string-like excitation on the other side of the duality defect. This finding offers a tangible resolution to a problem that has perplexed physicists for decades, illustrating the power of quantum entanglement and topological defects in explaining seemingly paradoxical phenomena.
Brief written by urgent.news from Phys.org's own syndicated text. Machine-written — it may contain errors, so check the original before relying on it.
