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Hollow sphere: a flexible multimode gravitational wave antenna

Hollow spheres have the same theoretical capabilities as the usual solid ones, since they share identical symmetries. The hollow sphere is, however, more flexible, as thickness is an additional parameter one can vary to approach given specifications. I will briefly discuss the more relevant properties of the hollow sphere as a GW detector (frequencies, cross-sections), and suggest some scenarios where it can generate significant astrophysical information.