Local supersymmetry enhancement and the entropy of three-charge black holes

Abstract: In string theory, black holes can be realised as bound states of branes and strings. The branes and the strings preserve a set of global supersymmetries, which imposes the geometry of the near-horizon region. However, there exists a whole moduli space of brane systems that preserve those same global supersymmetries, but whose number of local supersymmetries is enhanced. Such brane configuration should describe some microstates of the black hole; but how much of the black-hole entropy can these configurations account for?

In this talk, I will first present this formalism based on local supersymmetries that identifies the ingredients needed to describe the microstates of a supersymmetric black hole. Then, I will illustrate the local supersymmetry enhancement mechanism with the three-charge F1-NS5-P black hole in Type IIA. The black-hole entropy is accounted by the fractionation, due to the presence of the five-branes, of the fundamental strings into many ‘little strings’ which act as independent momentum carriers. I will apply the supersymmetric enhancement mechanism to these brane systems, and show it gives rise to a new class of black-hole microstate solutions which preserve the rotational symmetry of the black-hole horizon. Finally, I will explain why one could expect their supergravity description to be horizonless in the M-theory frame, and how our results point towards a change of strategy in the fuzzball programme in the endeavour of constructing horizonless black-hole microstates.

cosmology and nongalactic astrophysicsgeneral relativity and quantum cosmologyHEP - phenomenologyHEP - theorymathematical physics

Audience: researchers in the discipline

AnLy Strings and Fields online seminars