Morse inequalities for Fourier components of Kohn-Rossi cohomology of CR covering manifolds with $S^1$-action

Abstract

Let $X$ be a compact connected CR manifold of dimension $2n+1,n\ge 1$. Let $\tilde{X}$ be a paracompact CR manifold with a transversal CR $S^1$-action, such that there is a discrete group $\Gamma$ acting freely on $\tilde{X}$ having $X=\tilde{X}/\Gamma$. Based on an asymptotic formula for the Fourier components of the heat kernel with respect to the $S^1$-action, we establish the Morse inequalities for Fourier components of reduced $L^2$-Kohn-Rossi cohomology with values in a rigid CR vector bundle over $\tilde{X}$. As a corollary, we obtain the Morse inequalities for Fourier components of Kohn-Rossi cohomology on $X$ which were obtained by Hsiao-Li by using Szegö kernel method.

arXiv comment18 pages. arXiv admin note: text overlap with arXiv:1605.07507, arXiv:1706.01078

References in corpus (1)

• Szegö kernel asymptotics and Morse inequalities on CR manifolds