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We probe D1D5 micro-state geometries with massless particles, waves andstrings. To this end, we study geodetic motion, Klein-Gordon equation andstring scattering in the resulting gravitational background. Due to the reducedrotational symmetry, even in the simple case of a circular fuzzball, the systemcannot be integrated elementarily. Yet, for motion in the plane of the stringprofile or in the orthogonal plane to it, one can compute the deflection angleor the phase shift and identify the critical impact parameter, at which even amassless probe is captured by the fuzzball if its internal momentum is properlytuned. We find agreement among the three approaches, thus giving furthersupport to the fuzzball proposal at the dynamical level.

Probing Fuzzballs with Particles, Waves and Strings