$\mathbf{F}$-jumping numbers can be irrational

Abstract

Let $k$ be an $F$-finite and infinite field of characteristic $p>2$. We show, there exist infinitely many $F$-finite local domains $(R,\mathfrak{m})$ which are not $\mathbb{Q}$-Gorenstein and $τ_{\mathrm{b}}(R;\mathfrak{m}^t)$ has all but finitely many \emph{irrational} $F$-jumping numbers.