Journey to the Center of the Fuzzball

Understand

We study 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, they 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.