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Emergence of a renormalized 1/N expansion in quenched critical many-body systems

DOI to cite this document:
Geiger, Benjamin ; Urbina, Juan Diego ; Richter, Klaus
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Date of publication of this fulltext: 22 Oct 2020 04:35


We consider the fate of 1/N expansions when a many-body quantum system is quenched across criticality and show the emergence of exp(2λt)/N as renormalized parameter ruling the quantum-classical transition and accounting non-perturbatively for the local divergence rate λ of mean-field solutions. In terms of exp(2λt)/N, quasiclassical expansions of paradigmatic examples of criticality like the ...


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