Abstract
We study the stability properties of nodal sets of Laplace eigenfunctions on compact manifolds under specific small perturbations. We prove that nodal sets are fairly stable if such perturbations are relatively small, more formally, supported at a sub-wavelength scale. We do not need any generic assumption on the topology of the nodal sets or the simplicity of the Laplace spectrum. As an indirect application, we are able to show that a certain “Payne property” concerning the second nodal set remains stable under controlled perturbations of the domain.
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Notes
We use the analyst’s sign convention, that is, \(-\Delta \) is positive semidefinite.
The heuristic that symmetry implies spectral multiplicity seems to be well-known in the community. If the symmetry group of the plate is non-commutative, then some one can bring in some representation theoretic arguments to justify the above mentioned multiplicity. For a detailed proof, see [35].
Here we have used the word “sweepout” in an intuitive sense. However, for linear combinations of eigenfunctions (not necessarily for same eigenvalue), a more precise mathematical formulation exist for this intuitive picture. See [8] for such a formulation.
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Acknowledgements
The authors are grateful to IIT Bombay for providing ideal working conditions. The second named author would like to thank the Council of Scientific and Industrial Research, India for funding which supported his research. The authors would like to acknowledge useful conversations with Bogdan Georgiev, Gopala Krishna Srinivasan and Harsha Hutridurga and the first author would like to thank Nitin Nitsure for asking him the question of sand patterns on symmetrical plates mentioned on page 2. Further, the authors are deeply indebted to Junya Takahashi for giving a detailed clarification of certain aspects of Theorem 3.4. Finally, thanks are due to the anonymous Referees, whose many insightful comments enhanced the quality of the paper appreciably.
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Mukherjee, M., Saha, S. Nodal sets of Laplace eigenfunctions under small perturbations. Math. Ann. 383, 475–491 (2022). https://doi.org/10.1007/s00208-021-02144-3
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DOI: https://doi.org/10.1007/s00208-021-02144-3