Buchsbaumness, Macaulayfication and Castelnuovo-Mumford regularity of monomial curves

Abstract

Projective monomial curves are associated with rings generated by monomials of equal degree in two variables. In this paper, we give an infinite class of non-smooth, non Cohen-Macaulay $k$-Buchsbaum projective monomial curves for any $k\ge 1$ and find the monomial generators for the respective Macaulayfication. More generally, we demonstrate a method to find the Macaulayfication of a $k$-Buchsbaum monomial curve for any $k\ge 1$. We also discuss Castelnuovo-Mumford regularity of certain curves in terms of $k$-Buchsbaumness.

In this revised version, we have added several new results and further strengthened the manuscript. The manuscript has been accepted for publication in the Proceedings of the American Mathematical Society