ESQPTs in constrained bosonic systems can be found from stationary points of a Lagrange function, and the boundary singularities of Holstein-Primakoff mappings disappear when a complete atlas of mappings is used.
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Excited-state quantum phase transitions in constrained systems
ESQPTs in constrained bosonic systems can be found from stationary points of a Lagrange function, and the boundary singularities of Holstein-Primakoff mappings disappear when a complete atlas of mappings is used.