Fano-Mori contractions of high length on projective varieties with terminal singularities

Abstract

Let X be a projective variety with terminal singularities and let L be an ample Cartier divisor on X. We prove that if f is a birational contraction associated to an extremal ray $R\subset \overline{NE(X)}$ such that R.(K_X+(n-2)L)<0, then f is a weighted blow-up of a smooth point. We then classify divisorial contractions associated to extremal rays R such that R.(K_X+rL)<0, where r is a non-negative rational number, and the fibres of f have dimension less or equal to r+1.

12 pages. We fixed some lemmas and improved the exposition. To appear in the Bulletin of the London Mathematical Society

References in corpus (1)

• Divisorial contractions in dimension three which contract divisors to smooth points

Cited by in corpus (1)

• Divisorial contractions to codimension three orbits