Let G be a connected reductive complex algebraic group acting on a smooth complete complex algebraic variety X. We assume that X is a regular embedding, a condition satisfied in particular by smooth toric varieties and flag varieties. For any set D of G-stable prime divisors, we study the action on X of the group AutA degrees(X, D), the connected automorphism group of X stabilizing all elements of D. We determine a Levi subgroup A(X, D) of AutA degrees(X, D), and also relevant invariants of X as a spherical A(X, D)-variety. As a byproduct, we obtain a complete description of the inclusion relation between closures of A(X, D)-orbits on X.

On reductive automorphism groups of regular embeddings / Pezzini, Guido. - In: TRANSFORMATION GROUPS. - ISSN 1083-4362. - STAMPA. - 20:1(2015), pp. 247-289.

On reductive automorphism groups of regular embeddings

PEZZINI, Guido
2015

Abstract

Let G be a connected reductive complex algebraic group acting on a smooth complete complex algebraic variety X. We assume that X is a regular embedding, a condition satisfied in particular by smooth toric varieties and flag varieties. For any set D of G-stable prime divisors, we study the action on X of the group AutA degrees(X, D), the connected automorphism group of X stabilizing all elements of D. We determine a Levi subgroup A(X, D) of AutA degrees(X, D), and also relevant invariants of X as a spherical A(X, D)-variety. As a byproduct, we obtain a complete description of the inclusion relation between closures of A(X, D)-orbits on X.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11573/968345
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