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cond-mat.stat-mech2026
Observing quantum phase transitions at non-zero temperature: non-analytic behavior of order-parameter correlation times
István Csépányi, Giuseppe Del Vecchio Del Vecchio, Benjamin Doyon +1
Phase transitions occur when a macroscopic number of local degrees of freedom coherently change their behavior. In ground states of quantum many-body systems, phase transitions due…
cond-mat.stat-mech2025
Nonlinear projection for ballistic correlation functions: a formula in terms of minimal connected covers
Benjamin Doyon
In many-body systems, the dynamics is governed, at large scales of space and time, by the hydrodynamic principle of projection onto the conserved densities admitted by the model. T…
cond-mat.stat-mech2025
Rigorous bound on hydrodynamic diffusion for chaotic open spin chains
Dimitrios Ampelogiannis, Benjamin Doyon
The emergence of diffusion is one of the deepest physical phenomena observed in many-body interacting, chaotic systems. But establishing rigorously that correlation functions, say…