TY  - JOUR
PB  - SciPost Foundation
DO  - 10.21468/SciPostPhys.17.2.033
TI  - Large deviations in the symmetric simple exclusion process with slow boundaries: A hydrodynamic perspective
PY  - 2024/08/05
UR  - https://scipost.org/SciPostPhys.17.2.033
JF  - SciPost Physics
JA  - SciPost Phys.
VL  - 17
IS  - 2
SP  - 033
A1  - Saha, Soumyabrata
AU  - Sadhu, Tridib
AB  - We revisit the one-dimensional model of the symmetric simple exclusion process slowly coupled with two unequal reservoirs at the boundaries. In its non-equilibrium stationary state, the large deviations functions of density and current have been recently derived using exact microscopic analysis by Derrida, Hirschberg and Sadhu in [J. Stat. Phys. 182, 15 (2021)]. We present an independent derivation using the hydrodynamic approach of the macroscopic fluctuation theory (MFT). The slow coupling introduces additional boundary terms in the MFT-Action, which modifies the spatial boundary conditions for the associated variational problem. For the density large deviations, we explicitly solve the corresponding Euler-Lagrange equations using a simple local transformation of the optimal fields. For the current large deviations, our solution is obtained using the additivity principle. In addition to recovering the expression of the large deviations functions, our solution describes the most probable path for these rare fluctuations.
ER  -

@Article{10.21468/SciPostPhys.17.2.033,
	title={{Large deviations in the symmetric simple exclusion process with slow boundaries: A hydrodynamic perspective}},
	author={Soumyabrata Saha and Tridib Sadhu},
	journal={SciPost Phys.},
	volume={17},
	pages={033},
	year={2024},
	publisher={SciPost},
	doi={10.21468/SciPostPhys.17.2.033},
	url={https://scipost.org/10.21468/SciPostPhys.17.2.033},
}