Year: 2026
Type: preprint
Abstract: We establish a volume bound for weighted graphs with positive Bakry--Émery curvature through entropy estimates for the heat flow and characterize the equality case. As a consequence, if a connected unweighted graph $G=(V,E)$ satisfies the Bakry--Émery curvature--dimension condition $CD(2,\infty)$ with respect to the unnormalized Laplacian, then $$ |V|\le 2^d, $$ where $d$ denotes the maximum degree. Equality holds if and only if $G$ is a hypercube. We also establish an analogous volume rigidity result for the normalized Laplacian.
Source: arXiv (Cornell University)
Authors: Ding, Yanlong, Liu, Shiping, Zhou, Chiyu
Language: English
Subfield: Applied Mathematics
Field: Mathematics
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W7222984725