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1. Integer dual dimensions in scale-separated AdS3 from massive IIA

   https://doi.org/10.1007/JHEP06(2025)130  

   Farakos, Fotis; Tringas, George (June 2025, Journal of High Energy Physics)

   A<sc>bstract</sc> We study supersymmetric scale-separated AdS₃flux vacua of massive IIA on G2 orbifolds with smeared orientifold planes. We consider two types of$$ {T}^7/{Z}_2^3 $$ $T^7/Z_2^3$orbifolds which, with appropriate flux choices, yield integer dual dimensions for the operators corresponding to the closed string scalar fields in the dual CFT. As with all other known examples, the dual conformal dimensions are only parametrically close to integer values. 

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2. Janus on the brane

   https://doi.org/10.1007/JHEP07(2020)243  

   Gutperle, Michael; Uhlemann, Christoph F. (July 2020, Journal of High Energy Physics)

   null (Ed.)

   Abstract We present a non-supersymmetric deformation of probe branes describing conformal defects of codimension two in AdS/CFT. The worldvolume of the probe branes is deformed from AdS p × S 1 embedded in an AdS p +2 × ℳ D  −  p  − 2 background to an embedding of Janus form, which uses an AdS p− 1 slicing of AdS p and in which the brane bends along the slicing coordinate. In field theory terms this realizes conformal interfaces on codimension- two defects. We discuss these “Janus on the brane” solutions for AdS 3 × S 1 D3-branes in the AdS 5 × S 5 solution of Type IIB, realizing interfaces on surface defects in $$ \mathcal{N} $$ N = 4 SYM, and show that similar solutions exist for probe branes in AdS p +2 × S 9 −p vacua of M-theory and in the AdS 6 × S 4 solution of massive Type IIA. 

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3. Non-BPS bubbling geometries in AdS3

   https://doi.org/10.1007/JHEP02(2023)133  

   Bah, Ibrahima; Heidmann, Pierre (February 2023, Journal of High Energy Physics)

   A bstract We construct large classes of non-BPS smooth horizonless geometries that are asymptotic to AdS 3 × S 3 × T 4 in type IIB supergravity. These geometries are supported by electromagnetic flux corresponding to D1-D5 charges. We show that Einstein equations for systems with eight commuting Killing vectors decompose into a set of Ernst equations, thereby admitting an integrable structure. This feature, which can a priori be applied to other $$ {\textrm{AdS}}_D\times \mathcal{C} $$ AdS D × C settings in supergravity, allows us to use solution-generating techniques associated with the Ernst formalism. We explicitly derive solutions by applying the charged Weyl formalism that we have previously developed. These are sourced internally by a chain of bolts that correspond to regions where the orbits of the commuting Killing vectors collapse smoothly. We show that these geometries can be interpreted as non-BPS T 4 and S 3 deformations on global AdS 3 × S 3 × T 4 that are located at the center of AdS 3 . These non-BPS deformations can be made arbitrarily small and should therefore correspond to non-supersymmetric operators in the D1-D5 CFT. Finally, we also construct interesting bound states of non-extremal BTZ black holes connected by regular bolts. 

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4. AdS bulk locality from sharp CFT bounds

   https://doi.org/10.1007/JHEP11(2021)164  

   Caron-Huot, Simon; Mazáč, Dalimil; Rastelli, Leonardo; Simmons-Duffin, David (November 2021, Journal of High Energy Physics)

   A bstract It is a long-standing conjecture that any CFT with a large central charge and a large gap ∆ gap in the spectrum of higher-spin single-trace operators must be dual to a local effective field theory in AdS. We prove a sharp form of this conjecture by deriving numerical bounds on bulk Wilson coefficients in terms of ∆ gap using the conformal bootstrap. Our bounds exhibit the scaling in ∆ gap expected from dimensional analysis in the bulk. Our main tools are dispersive sum rules that provide a dictionary between CFT dispersion relations and S-matrix dispersion relations in appropriate limits. This dictionary allows us to apply recently-developed flat-space methods to construct positive CFT functionals. We show how AdS 4 naturally resolves the infrared divergences present in 4D flat-space bounds. Our results imply the validity of twice-subtracted dispersion relations for any S-matrix arising from the flat-space limit of AdS/CFT. 

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5. Non-invertible symmetries in SN orbifold CFTs and holography

   https://doi.org/10.1007/JHEP09(2024)110  

   Gutperle, Michael; Li, Yan-Yan; Rathore, Dikshant; Roumpedakis, Konstantinos (September 2024, Journal of High Energy Physics)

   We study non-invertible defects in two-dimensionalS_Norbifold CFTs. We construct universal defects which do not depend on the details of the seed CFT and hence exist in any orbifold CFT. Additionally, we investigate non-universal defects arising from the topological defects of the seed CFT. We argue that there exist universal defects that are non-trivial in the large-Nlimit, making them relevant for the AdS₃/CFT₂correspondence. We then focus on AdS₃×S³×$$ {\mathcal{M}}_4 $$ $M_4$with one unit of NS-NS flux and propose an explicit realization of these defects on the worldsheet. 

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