Curves in ${\mathbb P}^n$ of analytic spread at most $n$

We study closed subschemes $X$ in ${ \mathbb P}^n$ of dimension one, locally defined at any point by at most $n$ equations such that the analytic spread of $I_{ \mathfrak{ m}}$ is at most $n$, where $I \subseteq \Bbbk[x_0, \ldots, x_n] $ is the defining ideal of $X$ and ${ \mathfrak{ m}} = (x_0, \ldots, x_n)$. In this situation, we show that, under mild conditions, all the powers of $I_{ \mathfrak{ m}}$ have positive depth, hence the limit depth of $I_{ \mathfrak{ m}}$ is $1$ unless $I$ is a complete intersection. Moreover, the regularity of the Rees ring is at most one and the fiber cone is Cohen-Macaulay. This applies to every ideal defining a monomial curve in ${ \mathbb P}^3$.

Categories: math.AC