Hair-brane Ideas on the Horizon

TL;DR

This paper explores microstate geometries involving branes in deepening throats, linking gravitational entropy with dual CFT descriptions and proposing a horizon-based perspective on black hole microstates.

Contribution

It introduces a quiver quantum mechanical model of wrapped branes that captures a significant portion of black hole entropy and connects horizon microstates to dual CFT long strings.

Findings

The model reproduces the correct scaling of entropy with charges.

Long strings in the CFT correspond to branes at the horizon.

Results support a horizon-based microstate picture for BPS black holes.

Abstract

We continue an examination of the microstate geometries program begun in arXiv:1409.6017, focussing on the role of branes that wrap the cycles which degenerate when a throat in the geometry deepens and a horizon forms. An associated quiver quantum mechanical model of minimally wrapped branes exhibits a non-negligible fraction of the gravitational entropy, which scales correctly as a function of the charges. The results suggest a picture of AdS_3/CFT_2 duality wherein the long string that accounts for BTZ black hole entropy in the CFT description, can also be seen to inhabit the horizon of BPS black holes on the gravity side.