ScalingStacks

Example 5.9 . [02EZ]

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Example 5.9.

Let V=ℂ2/±1V=\mathbb{C}^{2}/{\pm 1}. Let (x,y)(x,y) be the usual affine coordinates on ℂ2\mathbb{C}^{2}, (u,v,w)(u,v,w) those on ℂ3\mathbb{C}^{3}. The formulas u=x2,v=y2,w=x​yu=x^{2},\ v=y^{2},\ w=xy realize VV as the closed subscheme of ℂ3\mathbb{C}^{3} whose equation is u​v−w2=0uv-w^{2}=0. We have two ‘natural’Kähler metrics on VV, the first one is smooth with potential φ1=|u|2+|v|2+|w|2\varphi^{1}=|u|^{2}+|v|^{2}+|w|^{2}, induced by the euclidean Kähler metric of ℂ3\mathbb{C}^{3}, the second one is the Kähler current whose potential is φ2=|u|+|v|\varphi^{2}=|u|+|v|. On Vr​e​gV^{reg} it is the quotient of the euclidean metric restricted to ℂ2−{0}\mathbb{C}^{2}-\{0\}. Near 00, d​dc​φ2≫d​dc​φ1dd^{c}\varphi^{2}\gg dd^{c}\varphi^{1}.

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