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arXiv 1502.02365math.CVmath.DG
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具有$S^1$作用的CR流形上的Szegö核渐近性和Morse不等式

Szegö kernel asymptotics and Morse inequalities on CR manifolds with $S^1$ action

Chin-Yu Hsiao, Xiaoshan Li

摘要:

设$X$是维数为$2n-1, n\geq 2$的紧致连通CR流形.我们假设在$X$上存在一个横向CR局部自由$S^1$作用.令$L^k$为刚性CR线束$L$除以$X$的$k$次方。在不对$X$的Levi-形式作任何假设的情况下,得到了部分SzegIgnkernel在$(0,q)$ -形式上的标度上界,其值为$L^k$ .在积分之后,这给出了弱Morse不等式。通过精细的谱分析,我们还得到了CR背景下的强Morse不等式.我们应用强Morse不等式证明了Grauert-Riemenschneider准则在CR环境下也成立。

英文摘要:

Let $X$ be a compact connected CR manifold of dimension $2n-1, n\geq 2$. We assume that there is a transversal CR locally free $S^1$ action on $X$. Let $L^k$ be the $k$-th power of a rigid CR line bundle $L$ over $X$. Without any assumption on the Levi-form of $X$, we obtain a scaling upper-bound for the partial Szegő kernel on $(0,q)$-forms with values in $L^k$. After integration, this gives the weak Morse inequalities. By a refined spectral analysis, we also obtain the strong Morse inequalities in CR setting. We apply the strong Morse inequalities to show that the Grauert-Riemenschneider criterion is also true in the CR setting.

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