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arXiv 0903.4399math.AG
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齐次主丛与稳定性

Homogeneous principal bundles and stability

Indranil Biswas

摘要:

设G/P是有理齐次簇,其中P是定义在特征为零的代数闭域上的单连通线性代数群G的抛物子群. G/P上的齐次主丛是半稳定的(多稳定的)当且仅当它是等变半稳定的(多稳定的)。一个稳定的齐次主H丛(E_H,ρ)是等变稳定的,但一般情况下反之则不成立。若齐次主H-丛(E_H,ρ)不是等变稳定的,但也不是稳定的,则E_H允许G的作用ρ'使得(E_H,ρ')是一个非等变稳定的齐次主H-丛.

英文摘要:

Let G/P be a rational homogeneous variety, where P is a parabolic subgroup of a simple and simply connected linear algebraic group G defined over an algebraically closed field of characteristic zero. A homogeneous principal bundle over G/P is semistable (respectively, polystable) if and only if it is equivariantly semistable (respectively, equivariantly polystable). A stable homogeneous principal H-bundle (E_H ,ρ) is equivariantly stable, but the converse is not true in general. If a homogeneous principal H-bundle (E_H ,ρ) is not equivariantly stable but not stable, then E_H admits an action ρ' of G such that the pair (E_H ,ρ') is a homogeneous principal H-bundle which is not equivariantly stable.

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