Entropy transport in closed quantum many-body systems far from equilibrium
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arXiv
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| Hauptverfasser: | , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866908621146685440 |
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| author | Marijan, J. Strobel, H. Oberthaler, M. K. Berges, J. |
| author_facet | Marijan, J. Strobel, H. Oberthaler, M. K. Berges, J. |
| contents | 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2510_26873 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Entropy transport in closed quantum many-body systems far from equilibrium Marijan, J. Strobel, H. Oberthaler, M. K. Berges, J. Quantum Gases High Energy Physics - Theory Quantum Physics 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. |
| title | Entropy transport in closed quantum many-body systems far from equilibrium |
| topic | Quantum Gases High Energy Physics - Theory Quantum Physics |
| url | https://arxiv.org/abs/2510.26873 |