We investigate several geometrical and physical properties of the recently found $W$-soliton solution (neutral case). We discuss both the genuine five-dimensional solution and its reduction to four dimensions and highlight similarities and differences. In both cases, we study scattering processes of massless and massive particles in the background, reconstructing the gauge-invariant scattering angle, either with exact expressions or with large-angular momentum expansion expressions, which we show how to resum in a useful form. Finally, we analyze the propagation of a test scalar field in the $W$-soliton background and compute the spectrum of quasinormal modes in the case of (non)minimal coupling and the radiated energy in the case of minimal coupling. Our result for the energy loss is fully analytic and presented in a post-Newtonian expansion, following the approach termed gravitational self-force.

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• General relativity
• Gravitational waves