Necessary and sufficient conditions for the discreteness of the Laplacian on a noncompact Riemannian manifold M are established in terms of the isocapacitary function of M. The relevant capacity takes a different form according to whether M has finite or infinite volume. Conditions involving the more standard isoperimetric function of M can also be derived, but they are only sufficient in general, as we demonstrate by concrete examples.
机构:
Nanjing Normal Univ, Inst Math, Sch Math Sci, Nanjing 210023, Peoples R ChinaNanjing Normal Univ, Inst Math, Sch Math Sci, Nanjing 210023, Peoples R China
He, Yue
Pu, Shiyun
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机构:
Nanjing Normal Univ, Inst Math, Sch Math Sci, Nanjing 210023, Peoples R ChinaNanjing Normal Univ, Inst Math, Sch Math Sci, Nanjing 210023, Peoples R China