Casimir forces between point obstacles for a massless scalar field are always attractive, decompose into non-local pairwise contributions, and arise from multiple-scattering processes captured by a convergent Born series.
Strohmaier, Dimensional reduction formulae for spectral traces and Casimir energies , Lett
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Vacuum and thermal fluctuations of a scalar field with point interactions
Casimir forces between point obstacles for a massless scalar field are always attractive, decompose into non-local pairwise contributions, and arise from multiple-scattering processes captured by a convergent Born series.