Entropy transport in closed quantum many-body systems far from equilibrium

• URL: http://arxiv.org/abs/2510.26873v1
• Date: Thu, 30 Oct 2025 18:00:00 GMT
• Title: Entropy transport in closed quantum many-body systems far from equilibrium
• Authors: J. Marijan, H. Strobel, M. K. Oberthaler, J. Berges,
• Abstract summary: entropy transport for universal scaling phenomena in closed quantum many-body systems far from equilibrium.<n>From spatially resolved experimental data of a spinor Bose gas, we demonstrate that entropy decreases on long-distance scales while it increases at short distances.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: We investigate entropy transport for universal scaling phenomena in closed quantum many-body systems far from equilibrium. From spatially resolved experimental data of a spinor Bose gas, we demonstrate that entropy decreases on long-distance scales while it increases at short distances. A dynamical separation of scales leads to macrophysics with long-range order, which is insensitive to the highly entropic microphysical processes. Since the total von Neumann entropy is conserved on a fundamental level for the quantum system, our analysis reveals a reciprocal connection between the emergence of macroscopic structure and microscopic disorder. To illustrate the scope of this connection, we exemplify the universal phenomenon also in a relativistic quantum field theory calculation from first principles, which is relevant for particle physics and early-universe cosmology.

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