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 Aut°(X, D), the connected automorphism group of X stabilizing all elements of D. We determine a Levi subgroup A(X, D) of Aut°(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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*Partially supported by the DFG Schwerpunktprogramm 1388 — Darstellungstheorie.
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PEZZINI, G. ON REDUCTIVE AUTOMORPHISM GROUPS OF REGULAR EMBEDDINGS. Transformation Groups 20, 247–289 (2015). https://doi.org/10.1007/s00031-015-9304-2
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DOI: https://doi.org/10.1007/s00031-015-9304-2