Michel Brion: Log homogeneous pairs

Abstract : Consider a smooth complete algebraic variety X and a
reduced effective divisor D on X, with normal crossings. We say that
the pair (X,D) is log homogeneous if the logarithmic tangent sheaf
(consisting of vector fields on X which preserve D) is generated by
its global sections. The talk will discuss the structure and
classification of log homogeneous pairs; they turn out to be closely
related to spherical varieties.