Abstract
We compute the Szegö kernels of the unit circle bundles of homogeneous negative line bundles over a compact Hermitian symmetric space. We prove that their logarithmic terms vanish in all cases and, further, that the circle bundles are not diffeomorphic to the unit sphere in \({\mathbb C^n}\) for Grassmannian manifolds of higher ranks. In particular, they provide an infinite family of smoothly bounded strictly pseudoconvex domains on complex manifolds for which the logarithmic term in the Fefferman expansion of the Szegö kernel vanishes but whose boundary is not diffeomorphic to the sphere (in fact, it is not even locally spherical). The analogous results for the Bergman kernel are also obtained.
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Research supported by the Swedish Science Council (VR), GA ČR grant 201/06/0128, and Czech Ministry of Education research plan MSM4781305904.
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Engliš, M., Zhang, G. Ramadanov conjecture and line bundles over compact Hermitian symmetric spaces. Math. Z. 264, 901–912 (2010). https://doi.org/10.1007/s00209-009-0495-x
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DOI: https://doi.org/10.1007/s00209-009-0495-x