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.
The ESQPT analysis is then extended to systems with an arbitrary number of constraints or integrals of motion by adopting the method of Lagrange multipliers
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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.