Full action of two deformation operators in the D1D5 CFT

119

String theory dynamics on certain fivebrane supertube backgrounds is described by an exactly solvable null-gauged WZW model. We use this description to compute the spectrum of closed string excitations on the three-charge nonsupersymmetric solution found by Jejjala, Madden, Ross and Titchener, as well as its supersymmetric limit. The low-lying spectrum matches that of supergravity modes in the effective geometry and exhibits an underlying group-theoretic structure. Winding sectors describe strings carrying the same charges as the background; processes whereby strings turn into flux or vice-versa are mediated by large gauge transformations on the worldsheet. The S-matrix of such wound strings probes microstructure of the fivebrane source that is hidden in the supergravity approximation. arXiv:1803.08505v1 [hep-th]

Section: Holographic Descriptionmentioning

confidence: 99%

String dynamics in NS5-F1-P geometries

Martinec

Massai

Turton

2018

119

“…This gives extra incentive for understanding twist operators, beyond their dominance at high energy. There has been a large body of work studying the effects of twist operators on states in this CFT [12,13,14,15,16,17,18,19,20].…”

Section: Introductionmentioning

confidence: 99%

The OPE of bare twist operators in bosonic SN orbifold CFTs at large N

Burrington

Jardine

Peet

2018

In this work, we explore the twist operator OPEs of a generic bosonic symmetric product (S N ) orbifold CFT. We conjecture that at large N the OPE of bare twist operators contains only bare twists and excitations of bare twists with fractional Virasoro modes. These fractionally excited operators are the only ones that depend exclusively on the lengths of the twists and the central charge, agreeing with the general structure of correlators of bare twists found in the literature. To provide evidence for this, we study the coincidence limit of a four point function of bare twist operators to several non-leading orders. We show how the coefficients of these powers can be reproduced by considering bare twist operators excited by fractional Virasoro modes in the exchange channels.

“…This is accomplished by one of the marginal operators in the theory, the deformation operator [26]. The deformation operator has been studied in a wide range of contexts [27][28][29][30][31][32][33][34][35][36][37][38]. This operator belongs to the twisted sector of the theory, and is the primary motivation for our current investigation.…”

Section: Introductionmentioning

confidence: 99%

Operator mixing in deformed D1D5 CFT and the OPE on the cover

Burrington

Jardine

Peet

2017

We consider the D1D5 CFT near the orbifold point and develop methods for computing the mixing of untwisted operators to first order by using the OPE on the covering surface. We argue that the OPE on the cover encodes both the structure constants for the orbifold CFT and the explicit form of the mixing operators. We show this explicitly for some example operators. We start by considering a family of operators dual to supergravity modes, and show that the OPE implies that there is no shift in the anomalous dimension to first order, as expected. We specialize to the operator dual to the dilaton, and show that the leading order singularity in the OPE reproduces the correct structure constant. Finally, we consider an unprotected operator of conformal dimension (2,2), and show that the leading order singularity and one of the subleading singularities both reproduce the correct structure constant. We check that the operator produced at subleading order using the OPE method is correct by calculating a number of three point functions using a Mathematica package we developed. Further development of this OPE technique should lead to more efficient calculations for the D1D5 CFT perturbed away from the orbifold point.