Black hole deconstruction

Abstract

A D4-D0 black hole can be deconstructed into a bound state of D0 branes with a D6-D6 pair containing worldvolume fluxes. The exact spacetime solution is known and resembles a D0 accretion disk surrounding a D6-D6 core. We find a scaling limit in which the disk and core drop inside an AdS 2 throat. Crossing this AdS 2 throat and the D0 accretion disk into the core, we find a second scaling region describing the D6-D6 pair. It is shown that the M-theory lift of this region is AdS 3 × S 2 . Surprisingly, time translations in the far asymptotic region reduce to global, rather than Poincaré, time translations in this core AdS 3 . We further find that the quantum mechanical ground state degeneracy reproduces the Bekenstein-Hawking entropy-area law.

Entropy Enhancement and Black Hole Microstates

“…It is also interesting to note that a similar conclusion -that deep, scaling, horizonless configurations can give a macroscopic (black-hole-like) entropy -was also reached in [18] and [19]. In [18] this was done by considering D0 branes in a background of D6 branes with world-volume fluxes, in the regime of parameters where the D0 branes do not back-react.…”

“…In [18] this was done by considering D0 branes in a background of D6 branes with world-volume fluxes, in the regime of parameters where the D0 branes do not back-react. In [19], a similar result was obtained by studying the quiver quantum mechanics of multiple D6 branes, in the regime where the branes do not back-react, but form a finite-sized configuration.…”

Hot attractors

“…Four decades after this realization, the underlying theory of statistical physics that explains the microscopic origin of entropy remains elusive. While significant progress has been made in cataloging microstates of maximally supersymmetric, extremal black holes within string theory [3][4][5][6], a similar understanding of black holes with a lower amount of symmetry is substantially less developed. Identifying the microstates relies crucially on holography [7,8] whose best studied avatar is the AdS/CFT correspondence [9][10][11].…”

Hair-brane ideas on the horizon

“…It suggests that the horizon of the BPS black hole in the M-theory duality frame is coated with a condensate of M2-branes that wrap the cycles ∆ ab , reminiscent of the analysis of [44,45], though the details here are rather different. 5 Similarly, in the type IIB frame, it seems that D3-branes wrap the horizon.…”

“…7 Thus, for M2-branes wrapping the cycles ∆ ab , the magnetic four-form flux is experienced by the center-of-mass dynamics on T 6 as an effective two-form magnetic field on T 2 (I) ⊂ T 6 of strength [44,45] 16) and Γ ab is given by the product of fluxes through the two-cycle ∆ ab [35,36], 17) which is the number of states in the lowest Landau level. The additional factors of q a,b arise from the Z q orbifold singularities at the poles of the cycle ∆ ab ; there are q a,b − 1 vanishing two-cycles at the orbifold locus, and the probe brane can wrap any of these as well as the two-cycle that stretches between the two poles, leading to q a q b independent membrane states for each choice of Landau level state.…”