The rationality conjecture for a Du Bois divisor

Let XX be a reduced scheme of finite type over a field of characteristic zero, and let DD be a Cartier divisor with Du Bois singularities. Assume that XDX\setminus D has rational singularities.

Rationality conjecture for a Du Bois divisor. Then XX has rational singularities, and in particular is Cohen–Macaulay.

This is proposed as a conjectural generalization of the result that a Du Bois Cartier divisor with smooth complement forces the ambient variety to have rational singularities. The source gives no resolution of this stronger statement.

Sources & referencesView supporting material

Primary source

Sándor J. Kovács, “Singularities of stable varieties”, arXiv:1102.1240 (2012).

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