Unique mild solution for the ES-BGK model with the correct Prandtl number
Abstract
We prove the existence and uniqueness of mild solutions to the ellipsoidal BGK (ES-BGK) model with the correct Prandtl number, under suitable weighted bounds and a free-transport non-vacuum condition. At the correct Prandtl number, the temperature tensor is no longer uniformly comparable to the scalar temperature, so classical scalar moment estimates do not directly yield the required Gaussian bounds. We derive anisotropic velocity moment estimates by splitting velocity space along the longest principal direction of the stress tensor and using the geometry of transverse elliptical slices. These estimates yield a linear weighted L∞ bound for the ellipsoidal Gaussian. Together with uniform ellipticity and weighted L1-Lipschitz continuity under the stated assumptions, this bound allows us to construct unique mild solutions.
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BibTeX
@misc{jeong2026unique,
title = {{Unique mild solution for the ES-BGK model with the correct Prandtl number}},
author = {Hyun-Woo Jeong and Sungsu Park},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.11867},
eprint = {2610.11867},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.11867},
}
RIS
TY - UNPB
TI - Unique mild solution for the ES-BGK model with the correct Prandtl number
AU - Hyun-Woo Jeong
AU - Sungsu Park
PY - 2026
DA - 2026/10/08
PB - arXiv
DO - 10.48550/arxiv.2610.11867
UR - https://arxiv.org/abs/2610.11867
AB - We prove the existence and uniqueness of mild solutions to the ellipsoidal BGK (ES-BGK) model with the correct Prandtl number, under suitable weighted bounds and a free-transport non-vacuum condition. At the correct Prandtl number, the temperature tensor is no longer uniformly comparable to the scalar temperature, so classical scalar moment estimates do not directly yield the required Gaussian bounds. We derive anisotropic velocity moment estimates by splitting velocity space along the longest principal direction of the stress tensor and using the geometry of transverse elliptical slices. These estimates yield a linear weighted L^∞ bound for the ellipsoidal Gaussian. Together with uniform ellipticity and weighted L^1-Lipschitz continuity under the stated assumptions, this bound allows us to construct unique mild solutions.
ER -