Differential forms on varieties with pre-$k$-rational singularities

Abstract

Let $X$ be a complex algebraic variety. With $\mathbb{Q}$-coefficients, the compactly supported cohomology groups $H_c^i(X,\mathbb{Q})$ and the compactly supported intersection cohomology groups $I{H}_c^i(X,\mathbb{Q})$ have mixed Hodge structures. We compare these two mixed Hodge structures for varieties with pre-$k$-rational singularities. We then study various notions of differential forms on varieties with pre-$k$-rational singularities. In particular, we investigate the depth of the complex ${\underline{\Omega }}_X^p$, where ${\underline{\Omega }}_X^p$ is the $p^{th}$-graded piece of the Du Bois complex.

arXiv commentv3: Exposition have been improved and corrected typos. Comments welcome!