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How to calculate the emergent symmetry group in deconfined quantum critical point problem like $SO(3) times Z_4 to SO(5)$?

Physics Asked on July 29, 2021

In the deconfined quantum criticality literatures like https://doi.org/10.1103/PhysRevX.9.041037, some equations are usually given: $$SO(3)times Z_{4}to SO(5),U(1)times Z_{4}to O(4),SO(3)times Z_2 to O(4),$$
but how to derive such relations?

It seems like the symmetries in the left hand side of above equations represent the symmetries of the phases in both sides of the transition points, such as the first line describe Neel-VBS transition, the order parameter of Neel phase has $SO(3)$ symmetry, and the VBS has $Z_4$ symmetry.

Question: Could anyone tell me how to derive above equations, and for example $U(1)times Z_2$ ?

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