Asymptotic behaviour of integral closures, quintasymptotic primes and ideal topologies (1708.04635v1)

Abstract: Let $R$ be a commutative Noetherian ring, $N$ a finitely generated $R$-module and $I$ an ideal of $R$. The set $\bar{Q^*}(I, N)$, the quintasymptotic primes of $I$ with respect to $N$, was originally introduced by McAdam \cite{Mc2}. Also, the ideal $I_a^{(N)}$, the integral closure of $I$ with respect to $N$, was introduced by R.Y. Sharp et al. in \cite{STY}. The purpose of this paper is to show that, whenever $S$ is a multiplicatively closed subset of $R$ then the topologies defined by ${(I^n)a^{(N)}}{n\geq1}$ and ${S((I^n)a^{(N)})}{n\geq1}$ are equivalent if and only if $S$ is disjoint from the quintasymptotic primes of $I$ with respect to $N$. In addition, using this result, we also show that, if $(R, \mathfrak{m})$ is local and $N$ is quasi-unmixed, then the local cohomology module $H^{\dim N}I(N)$ vanishes if and only if there exists a multiplicatively closed subset $S$ of $R$ such that $\mathfrak{m} \cap S \neq \emptyset$ and the topologies induced by ${(I^n)_a^{(N)}}{n\geq1}$ and ${S((I^n)a^{(N)})}{n\geq1}$ are equivalent. As a special of this characterization we obtain the main result of Marti-Farre \cite{MF}.