Transformation Groups ( IF 0.7 ) Pub Date : 2021-01-08 , DOI: 10.1007/s00031-020-09635-8 D. OEH
Let (\( \mathfrak{g} \), τ) be a real simple symmetric Lie algebra and let W ⊂ \( \mathfrak{g} \) be an invariant closed convex cone which is pointed and generating with τ(W) = −W. For elements h ∈ \( \mathfrak{g} \) with τ(h) = h, we classify the Lie algebras \( \mathfrak{g} \)(W, τ, h) which are generated by the closed convex cones \( {C}_{\pm}\left(W,\tau, h\right):= \left(\pm W\right)\cap {\mathfrak{g}}_{\pm 1}^{-\tau }(h) \), where \( {\mathfrak{g}}_{\pm 1}^{-\tau }(h):= \left\{x\in \mathfrak{g}:\tau (x)=-x\left[h,x\right]=\pm x\right\} \). These cones occur naturally as the skew-symmetric parts of the Lie wedges of endomorphism semigroups of certain standard subspaces. We prove in particular that, if \( \mathfrak{g} \)(W, τ, h) is non-trivial, then it is either a hermitian simple Lie algebra of tube type or a direct sum of two Lie algebras of this type. Moreover, we give for each hermitian simple Lie algebra and each equivalence class of involutive automorphisms τ of \( \mathfrak{g} \) with τ(W) = −W a list of possible subalgebras \( \mathfrak{g} \)(W, τ, h) up to isomorphy.
中文翻译:
实简单李代数的三阶因果子代数的分类
让(\(\ mathfrak {G} \),τ)是一个真正简单的对称李代数和让W¯¯ ⊂ \(\ mathfrak {G} \)是不变的封闭凸锥是尖并产生与τ(w ^) = -W。对于元件ħ ∈ \(\ mathfrak {G} \)与τ(ħ)= ^ h,我们分类的李代数\(\ mathfrak {G} \) (w ^,τ,ħ其由闭凸锥体产生)\({C} _ {\ pm} \ left(W,\ tau,h \ right):= \ left(\ pm W \ right)\ cap {\ mathfrak {g}} _ {\ pm 1} ^ { -\ tau}(h)\),其中\({\ mathfrak {g}} _ {\ pm 1} ^ {-\ tau}(h):= \ left \ {x \ in \ mathfrak {g}: \ tau(x)=-x \ left [h,x \ right] = \ pm x \ right \} \)。这些锥体自然地作为某些标准子空间的内同态半群的Lie楔形的倾斜对称部分出现。我们特别证明,如果\(\ mathfrak {g} \)(W,τ,h)是非平凡的,则它要么是管状的Hermitian简单Lie代数,要么是该类型的两个Lie代数的直接和。类型。此外,我们给每个埃尔米特简单李代数和每个等价类对合构的τ的\(\ mathfrak {g} \)且τ(W)= − W直到同构的可能子代数\(\ mathfrak {g} \)(W,τ,h)的列表。