# (07.12.) Probing Fuzzballs with Particles, Waves and Strings

Massimo Bianchi (Rome)

07.12.2017 at 16:15

After briefly reviewing the fuzzball proposal for solving the black-hole information paradox, we describe how to probe the micro-state geometries in the case of D1/D5 bound-states. To this end, we study geodetic motion, wave scattering and string scattering in the resulting gravitational background. Due to the reduced rotational symmetry, even in the simple case of a circular fuzzball, one cannot generically integrate the system. Yet for motion in the plane of the circle or in the orthogonal plane one can compute the deflection angle or the phase shift and identify the critical impact parameter, below which even a massless probe is captured by the fuzzball. We find agreement among the three approaches, thus giving further support to the fuzzball proposal at the dynamical level.

Arnold Sommerfeld Center

Theresienstrasse 37

Room 348