Arbitrary harmonic functions as Bose–Einstein condensates De Wilde, Michiel Seiringer, Robert ; https://orcid.org/0000-0002-6781-0521 We show that a suitable choice of boundary conditions for the Laplacian allows for the appearance of an arbitrary number of condensates, described by arbitrary harmonic functions, in the thermodynamic limit of an ideal Bose gas. AIP Publishing 2026 info:eu-repo/semantics/article doc-type:article text http://purl.org/coar/resource_type/c_2df8fbb1 https://research-explorer.ista.ac.at/record/22292 De Wilde M, Seiringer R. Arbitrary harmonic functions as Bose–Einstein condensates. <i>Journal of Mathematical Physics</i>. 2026;67(6). doi:<a href="https://doi.org/10.1063/5.0325354">10.1063/5.0325354</a> eng info:eu-repo/semantics/altIdentifier/doi/10.1063/5.0325354 info:eu-repo/semantics/altIdentifier/issn/0022-2488 info:eu-repo/semantics/altIdentifier/e-issn/1089-7658 info:eu-repo/semantics/altIdentifier/arxiv/2601.22883 info:eu-repo/semantics/openAccess