Kavli Affiliate: Emil J. Martinec
| First 5 Authors: Emil J. Martinec, Nicholas P. Warner, , ,
| Summary:
We consider the fate of a massless (or ultra-relativistic massive) string
probe propagating down the BTZ-like throat of a microstate geometry in the
D1-D5 system. Far down the throat, the probe encounters large tidal forces that
stretch and excite the string. The excitations are limited by the very short
transit time through the region of large tidal force, leading to a controlled
approximation to tidal stretching. We show that the amount of stretching is
proportional to the incident energy, and that it robs the probe of the kinetic
energy it would need to travel back up the throat. As a consequence, the probe
is effectively trapped far down the throat and, through repeated return passes,
scrambles into the ensemble of nearby microstates. We propose that this tidal
trapping may lead to weak gravitational echoes.
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