Chern--Simons flux attachment 2026-09-28
In an Abelian Chern--Simons theory, the equation of motion ties a quasiparticle's gauge charge to gauge flux . A quasiparticle of charge encircling it therefore acquires the Aharonov--Bohm phase .
Past exam of the mathematics course of the University of Cambridge 2023 iii Paper 342 1 a Solution 2026-09-28
Represent quasiparticle worldlines by conserved currents and add the minimal-coupling termUp to the corresponding sign convention for charge, variation of the Abelian Chern--Simons theory givesFor a static quasiparticle of integer gauge-charge vector , integration over a small surrounding disk yields the Chern--Simons flux attachment relationA quasiparticle of charge carried once around this flux acquires the Aharonov--Bohm phaseso
Past exam of the mathematics course of the University of Cambridge 2024 iii Paper 342 1 c Solution 2026-09-28
In the charge-flux composite model, particle acquires the Aharonov-Bohm effect phase when it circles the flux of particle . The reciprocal Aharonov-Casher effect contributes . Thus the full braid isThe assumption for and saysFor any allowed particle , the full braid with is ; similarly every particle braids trivially with . Under the stated operational identification,For , exchanging two identical composites is half their full braid and givesTherefore and reproduce the bosonic and particles, in either order, and reproduces their fermionic fusion product .