Application of Betti Splittings to the Regularity of Binomial Edge Ideals

Abstract

Let $G$ be a simple graph on $[n]$ vertices and $J_G$ denote the corresponding binomial edge ideal in $S=k[x_1,\dots ,x_n,y_1,\dots ,y_n]$, where $k$ is a field. In this paper, we provide an upper bound for the regularity of binomial edge ideals of trees. Our approach leverages the recently developed framework of Betti splittings of binomial edge ideals, a powerful technique for studying homological invariants via decompositions into simpler ideals. We also give a lower bound for the same. As a consequence, we explicitly compute the regularity of binomial edge ideals of trees under certain conditions.

17 pages, comments are welcome