A generalized coherent-state framework computes many-body density of states in irreducible sectors, supplies rigorous ground-state energy bounds, and identifies quantum and excited-state phase transitions in the LMG model and long-range Ising chains.
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Momentum-space entanglement entropy reaches ln 2 at DQPTs via exact degeneracy p=1/2 in the post-quench eigenbasis, providing a time-independent diagnostic.
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A Generalized Coherent State Framework for Many-Body Density of States
A generalized coherent-state framework computes many-body density of states in irreducible sectors, supplies rigorous ground-state energy bounds, and identifies quantum and excited-state phase transitions in the LMG model and long-range Ising chains.
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Critical Entanglement Dynamics at Dynamical Quantum Phase Transitions
Momentum-space entanglement entropy reaches ln 2 at DQPTs via exact degeneracy p=1/2 in the post-quench eigenbasis, providing a time-independent diagnostic.