The dark side of fuzzball geometries

Geodesic probes in certain horizonless microstate geometries experience extreme tidal forces long before reaching the region where these geometries differ significantly from the extremal BTZ black hole. The purpose of this paper is to show that this behavior is a universal feature of all geometries that have a long BTZ throat that terminates in a cap, regardless of the details of this cap. Hence, incoming probes will scramble into the microstate structure before they encounter the region where the charges of the solution are sourced, and the reason for this premature scrambling is the amplification of tiny geometrical deviations by the relativistic speeds of the probes. To illustrate the phenomenon, we construct a new family of smooth horizonless superstratum microstate geometries, dual to D1-D5 CFT states whose momentum charge is carried by excitations on CFT strands of length k. We also show that, in the large-k limit, these new superstrata resemble a blackened supertube solution everywhere except in the near-supertube region. Thus they resolve the singularity caused by the naive back-reaction of modes with non-linear instabilities near evanescent ergosurfaces.

Section: Discussionmentioning

confidence: 99%

Early scrambling and capped BTZ geometries

Bena

Martinec

Walker

et al. 2019

“…In a recent series of papers [48,49,50] 8 , Bianchi et al have studied geodesic motion and properties of scalar scattering from fuzzballs closely related to the one studied above. They have computed impact parameters at which the massless particle moving on geodesics is captured by the fuzzball.…”

Section: Conclusion and Discussionmentioning

confidence: 99%

Quasinormal modes of supersymmetric microstate geometries from the D1-D5 CFT

Chakrabarty

Ghosh

Virmani

2019

We revisit the study of the probe scalar quasinormal modes of a class of three-charge supersymmetric microstate geometries. We compute the real and imaginary parts of the quasinormal modes and show that in the parameter range when the geometries have large AdS region, the spectrum is precisely reproduced from a D1-D5 orbifold CFT analysis. The spectrum includes the slow decaying modes pointed out by Eperon, Reall, and Santos. We analyse in detail the nature of the quasinormal modes by studying the scalar wavefunction. We show that these modes correspond to slow leakage of excitation from AdS throat to infinity.

“…These solutions include sub-classes whose proposed dual CFT states display momentum fractionation [32], and include solutions that have parametrically long AdS 2 throats (in full, the throats are approximately AdS 2 ×S 1 ×S 3 ×T 4 ) [33,36], which have potentially important implications for AdS 2 holography [37]. Some special sub-families have the remarkable property of having completely integrable null geodesics [35]; for some recent studies of superstrata, see [55,56,39,57].…”

Section: Precision Holographic Tests Of Superstratamentioning

confidence: 99%

AdS3 holography at dimension two

Giusto

Rawash

Turton

2019

108

Holography can provide a microscopic interpretation of a gravitational solution as corresponding to a particular CFT state: the asymptotic expansion in gravity encodes the expectation values of operators in the dual CFT state. Such a correspondence is particularly valuable in black hole physics. We study supersymmetric D1-D5-P black holes, for which recently constructed microstate solutions known as "superstrata" provide strong motivation to derive the explicit D1-D5 holographic dictionary for CFT operators of total dimension two. In this work we derive the explicit map between one-point functions of scalar chiral primaries of dimension (1,1) and the asymptotic expansions of families of asymptotically AdS 3 × S 3 × M supergravity solutions, with M either T 4 or K3. We include all possible mixings between single-trace and multi-trace operators. We perform several tests of the holographic map, including new precision holographic tests of superstrata, that provide strong supporting evidence for the proposed dual CFT states.