Abstract
We study extremal two-charge fuzzball geometries, with attention to the use of the proper duality frame. For zero angular momentum there is an onion-like structure, and the smooth D1-D5 geometries are not valid for typical states. Rather, these geometries are best approximated by geometries with stringy sources, or by a free CFT. For non-zero angular momentum we find a regime where smooth fuzzball solutions are the correct description. Our analysis rests on the comparison of three radii: the typical fuzzball radius, the entropy radius determined by the microscopic theory, and the breakdown radius where the curvature becomes large. We attempt to draw more general lessons.
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Chen, F., Michel, B., Polchinski, J. et al. Journey to the center of the fuzzball. J. High Energ. Phys. 2015, 81 (2015). https://doi.org/10.1007/JHEP02(2015)081
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DOI: https://doi.org/10.1007/JHEP02(2015)081