String dynamics in NS5-F1-P geometries

We give a survey of the present status of the microstate geometries called superstrata. Superstrata are smooth, horizonless solutions of six-dimensional supergravity that represent some of the microstates of the D1-D5-P black hole in string theory. They are the most general microstate geometries of that sort whose CFT dual states are identified. After reviewing relevant features of the dual CFT, we discuss the construction of superstratum solutions in supergravity, based on the linear structure of the BPS equations. We also review some of recent work on generalizations of superstrata and physical properties of superstrata. Although the number of superstrata constructed so far is not enough to account for the black-hole entropy, they give us valuable insights into the microscopic physics of black holes.where J 3 0 is a generator of SU (2) L ∈ SO(4) coming from the rotational symmetry in the directions transverse to the D-branes.3 The CFT dual states of superstrata based on the five-dimensional multi-center solutions with two centers

Section: √ 2vmentioning

confidence: 99%

Counting superstrata

Shigemori

2019

“…Allowing O to be any CFT operator requires going beyond the supergravity approximation. The stringy description of black hole microstates beyond supergravity is an interesting open avenue, with recent progress [20,21], however developing a precise holographic dictionary in this more general context appears to be a formidable task. Secondly, for a typical microstates |H in a given ensemble, the deviation of the expectation values H|O i |H from the ensemble average values are expected to be exponentially suppressed in the large N limit (see e.g.…”

Section: Introductionmentioning

confidence: 99%

AdS3 holography at dimension two

Giusto

Rawash

Turton

2019

Self Cite

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.

“…In the classical GR analysis of[14] excitations can sit at the supertube locus where they cost zero energy, but as shown in[67] there is a gap in the spectrum.…”

mentioning

confidence: 99%

“…More precisely, as discussed in[67] the global structure of the gauge group is non-compact in the timelike direction and thus R L+R × U (1) L−R . The distinction, while important, will not affect our considerations here.…”

mentioning

confidence: 99%

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Little strings, long strings, and fuzzballs

Martinec

Massai

Turton

2019

Self Cite

111

At high energy densities, fivebranes are populated by a Hagedorn phase of so-called little strings, whose statistical mechanics underlies black fivebrane thermodynamics. A particular limit of this phase yields BTZ black holes in AdS 3 , leading us to the idea that in this context fuzzballs and highly excited little strings are one and the same. We explore these ideas through an analysis of D-brane probes of fivebrane supertube backgrounds. String theory dynamics on these backgrounds is described by an exactly solvable null-gauged WZW model. We develop the formalism of null gauging on worldsheets with boundaries, and find that D-branes wrapping topology at the bottom of the supertube throat are avatars of the "long string" structure that dominates the thermodynamics of the black hole regime, appearing here as excitations of supertubes lying near but slightly outside the black hole regime.