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Waves on Microstate Geometries

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The “fuzzball proposal” suggests that “microstate geometries” provide a classical, microscopic description of black holes. However, recent numerical and heuristic work indicates that they might be classically unstable, and this is now supported by several rigorous results. Overall, these results show that linear waves on microstate geometries behave very strangely indeed: despite avoiding the “Friedman instability”, they decay extremely slowly – even slower than could be achieved by any arrangement of mirrors in Minkowski space! Additionally, the presence of an “evanescent ergoregion” can lead to an arbitrarily large amplification of waves, despite the presence of a globally causal Killing vector field. Altogether, these results are indicative of a nonlinear instability.

This talk is part of the DAMTP Friday GR Seminar series.

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