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Upper bounds for the number of resonances on geometrically finite hyperbolic manifolds

David BorthwickColin Guillarmou — 2016

Journal of the European Mathematical Society

On geometrically finite hyperbolic manifolds Γ d , including those with non-maximal rank cusps, we give upper bounds on the number N ( R ) of resonances of the Laplacian in disks of size R as R . In particular, if the parabolic subgroups of Γ satisfy a certain Diophantine condition, the bound is N ( R ) = 𝒪 ( R d ( log R ) d + 1 ) .

Semiclassical spectral estimates for Toeplitz operators

David BorthwickThierry PaulAlejandro Uribe — 1998

Annales de l'institut Fourier

Let X be a compact Kähler manifold with integral Kähler class and L X a holomorphic Hermitian line bundle whose curvature is the symplectic form of X . Let H C ( X , ) be a Hamiltonian, and let T k be the Toeplitz operator with multiplier H acting on the space k = H 0 ( X , L k ) . We obtain estimates on the eigenvalues and eigensections of T k as k , in terms of the classical Hamilton flow of H . We study in some detail the case when X is an integral coadjoint orbit of a Lie group.

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