Daudé, Thierry; Helffer, Bernard; Nicoleau, François Exponential localization of Steklov eigenfunctions on warped product manifolds: the flea on the elephant phenomenon. (English. French summary) Zbl 07755373 Ann. Math. Qué. 47, No. 2, 295-330 (2023). Reviewer: Denis Borisov (Ufa) MSC: 35P15 58J50 35J25 PDFBibTeX XMLCite \textit{T. Daudé} et al., Ann. Math. Qué. 47, No. 2, 295--330 (2023; Zbl 07755373) Full Text: DOI arXiv
Gittins, K.; Helffer, B. Courant-sharp Robin eigenvalues for the square: the case with small Robin parameter. (English. French summary) Zbl 1434.35025 Ann. Math. Qué. 44, No. 1, 91-123 (2020). MSC: 35P05 35J05 58J50 58J37 PDFBibTeX XMLCite \textit{K. Gittins} and \textit{B. Helffer}, Ann. Math. Qué. 44, No. 1, 91--123 (2020; Zbl 1434.35025) Full Text: DOI arXiv
Charron, Philippe; Helffer, Bernard; Hoffmann-Ostenhof, Thomas Pleijel’s theorem for Schrödinger operators with radial potentials. (English. French summary) Zbl 1384.35048 Ann. Math. Qué. 42, No. 1, 7-29 (2018). MSC: 35P20 PDFBibTeX XMLCite \textit{P. Charron} et al., Ann. Math. Qué. 42, No. 1, 7--29 (2018; Zbl 1384.35048) Full Text: DOI arXiv
Helffer, Bernard Lower bound for the number of critical points of minimal spectral \(k\)-partitions for \(k\) large. (English. French summary) Zbl 1370.35223 Ann. Math. Qué. 41, No. 1, 111-118 (2017). MSC: 35P05 PDFBibTeX XMLCite \textit{B. Helffer}, Ann. Math. Qué. 41, No. 1, 111--118 (2017; Zbl 1370.35223) Full Text: DOI arXiv