Solution

ID: past-exam-of-the-mathematics-course-of-the-university-of-cambridge/2024/iii/paper-342/1/c/solution

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 is
The assumption for and says
For 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 gives
Therefore and reproduce the bosonic and particles, in either order, and reproduces their fermionic fusion product .

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