there are three smooth spherical Fano threefolds overNover\(\overline{{\mathbb {Q}}}\)that are neither horospherical nor equivariant compactifications of\({\mathbb {G}}_\textrm{a}^3\); we construct split models\(X_1,X_2,X_3\)over\({\mathbb {Q}}\)as in Table1. ...
Compactification of moduli of parabolic sheaves and moduli of parabolic Higgs sheaves ABSTRACT Let f:X→S be a smooth, projective, geometrically integral morphism of locally noetherian schemes, D be an effective relative Cartier divisor on ......