Quasi-Nambu-Goldstone modes exist universally in many-body scar models in the degenerate limit, with properties determined by the quasisymmetry of the scar tower.
For the ferromagnetic model, the quasisymmetry is SO(3), generated by usual spin gener- ators: ˆq± = ˆs±, ˆqz = ˆsz
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Quasi-Nambu-Goldstone modes in many-body scar models
Quasi-Nambu-Goldstone modes exist universally in many-body scar models in the degenerate limit, with properties determined by the quasisymmetry of the scar tower.