Zusammenfassung
We consider the fate of 1/N expansions in unstable many-body quantum systems, as realized by a quench across criticality, and show the emergence of e(2 lambda t)/N as a renormalized parameter ruling the quantum-classical transition and accounting nonperturbatively for the local divergence rate lambda of mean-field solutions. In terms of e(2 lambda t)/N, quasiclassical expansions of paradigmatic ...
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