Rationality conjecture for varieties with Du Bois divisors

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 Du Bois divisors. Then XX has rational singularities; in particular, XX is Cohen–Macaulay. This conjecture generalizes the known result in which XDX\setminus D is assumed smooth, and is motivated by the relationship between rational and Du Bois singularities. Its resolution status is not given in the supplied text.

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Primary source

Sándor J Kovács and Karl Schwede, “Hodge theory meets the minimal model program: a survey of log canonical and Du Bois singularities”, arXiv:0909.0993 (2009).

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