Thermal boundary conditions in fractional superdiffusion of energy
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| Format: | Preprint |
| Published: |
2025
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| author | Komorowski, Tomasz Olla, Stefano |
| author_facet | Komorowski, Tomasz Olla, Stefano |
| contents | We study heat conduction in a one-dimensional {finite},
unpinned chain of atoms
perturbed by stochastic momentum exchange and coupled to Langevin
heat baths at {possibly} distinct temperatures placed at the
endpoints of the chain.
While infinite systems without boundaries are known to exhibit
superdiffusive energy transport described by a fractional heat
equation with the generator $-|Δ|^{3/4}$,
the corresponding boundary conditions induced by heat baths
remain less understood.
We establish the hydrodynamic limit for a finite chain with $n+1$
atoms connected to thermostats at the endpoints,
deriving the macroscopic evolution of the averaged energy profile.
The limiting equation is governed by a non-local Lévy-type operator,
with boundary terms determined by explicit interaction kernels
that encode absorption, reflection, and transmission of long-wavelength
phonons at the baths. Our results provide the first rigorous identification
of boundary conditions for fractional superdiffusion arising directly
from microscopic dynamics with local interactions,
highlighting their distinction from both diffusive and pinned-chain settings |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2505_06952 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Thermal boundary conditions in fractional superdiffusion of energy Komorowski, Tomasz Olla, Stefano Mathematical Physics 82C70, 60K35 We study heat conduction in a one-dimensional {finite}, unpinned chain of atoms perturbed by stochastic momentum exchange and coupled to Langevin heat baths at {possibly} distinct temperatures placed at the endpoints of the chain. While infinite systems without boundaries are known to exhibit superdiffusive energy transport described by a fractional heat equation with the generator $-|Δ|^{3/4}$, the corresponding boundary conditions induced by heat baths remain less understood. We establish the hydrodynamic limit for a finite chain with $n+1$ atoms connected to thermostats at the endpoints, deriving the macroscopic evolution of the averaged energy profile. The limiting equation is governed by a non-local Lévy-type operator, with boundary terms determined by explicit interaction kernels that encode absorption, reflection, and transmission of long-wavelength phonons at the baths. Our results provide the first rigorous identification of boundary conditions for fractional superdiffusion arising directly from microscopic dynamics with local interactions, highlighting their distinction from both diffusive and pinned-chain settings |
| title | Thermal boundary conditions in fractional superdiffusion of energy |
| topic | Mathematical Physics 82C70, 60K35 |
| url | https://arxiv.org/abs/2505.06952 |