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Search: authors:"Kyriakos Papadodimas"

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Quantum teleportation through time-shifted AdS wormholes

Abstract Based on the work of Gao-Jafferis-Wall and Maldacena-Stanford-Yang, we observe that the time-shifted thermofield states of two entangled CFTs can be made traversable by an appropriate coupling of the two CFTs, or alternatively by the application of a modified quantum teleportation protocol. This provides evidence for the smoothness of the horizon for a large class of...

Aspects of Berry phase in QFT

When continuous parameters in a QFT are varied adiabatically, quantum states typically undergo mixing — a phenomenon characterized by the Berry phase. We initiate a systematic analysis of the Berry phase in QFT using standard quantum mechanics methods. We show that a non-trivial Berry phase appears in many familiar QFTs. We study a variety of examples including free...

Large-N correlation functions in \( \mathcal{N} \) = 2 superconformal QCD

We study extremal correlation functions of chiral primary operators in the large-N SU(N ) \( \mathcal{N} \) = 2 superconformal QCD theory and present new results based on supersymmetric localization. We discuss extensively the basis-independent data that can be extracted from these correlators using the leading order large-N matrix model free energy given by the four-sphere...

On exact correlation functions in SU(N) \( \mathcal{N}=2 \) superconformal QCD

We consider the exact coupling constant dependence of extremal correlation functions of \( \mathcal{N}=2 \) chiral primary operators in 4d \( \mathcal{N}=2 \) superconformal gauge theories with gauge group SU(N) and N f = 2N massless fundamental hypermultiplets. The 2- and 3-point functions, viewed as functions of the exactly marginal coupling constant and theta angle, obey the...

A toy model of black hole complementarity

We consider the algebra of simple operators defined in a time band in a CFT with a holographic dual. When the band is smaller than the light crossing time of AdS, an entire causal diamond in the center of AdS is separated from the band by a horizon. We show that this algebra obeys a version of the Reeh-Schlieder theorem: the action of the algebra on the CFT vacuum can approximate...

An infalling observer in AdS/CFT

We describe the experience of an observer falling into a black hole using the AdS/CFT correspondence. In order to do this, we reconstruct the local bulk operators measured by the observer along his trajectory outside the black hole. We then extend our construction beyond the black hole horizon. We show that this is possible because of an effective doubling of the observables in...

tt * equations, localization and exact chiral rings in 4d \( \mathcal{N} \) =2 SCFTs

We compute exact 2- and 3-point functions of chiral primaries in four-dimensional \( \mathcal{N} \) = 2 superconformal field theories, including all perturbative and instanton contributions. We demonstrate that these correlation functions are nontrivial and satisfy exact differential equations with respect to the coupling constants. These equations are the analogue of the tt...

Topological anti-topological fusion in four-dimensional superconformal field theories

Kyriakos Papadodimas 0 0 Institute for Theoretical Physics, University of Amsterdam , Valckenierstraat 65, 1018 XE, Amsterdam, The Netherlands We present some new exact results for general four

Emergent spacetime and holographic CFTs

We discuss universal properties of conformal field theories with holographic duals. A central feature of these theories is the existence of a low-lying sector of operators whose correlators factorize. We demonstrate that factorization can only hold in the large central charge limit. Using conformal invariance and factorization we argue that these operators are naturally...

A non-renormalization theorem for chiral primary 3-point functions

In this note we prove a non-renormalization theorem for the 3-point functions of 1/2 BPS primaries in the four-dimensional \( \mathcal{N} = 4 \) SYM and chiral primaries in two dimensional \( \mathcal{N} = \left( {4,4} \right) \) SCFTs. Our proof is rather elementary: it is based on Ward identities and the structure of the short multiplets of the superconformal algebra and it...

Small hairy black holes in AdS 5 × S 5

We study small hairy black holes in a consistent truncation of \( \mathcal{N} \) = 8 gauged supergravity that consists of a single charged scalar field interacting with the metric and a U(1) gauge field. Small very near extremal RNAdS black holes in this system are unstable to decay by superradiant emission. The end point of this instability is a small hairy black hole that we...

Holographic neutron stars

We construct in the context of the AdS/CFT correspondence degenerate composite operators in the conformal field theory that are holographically dual to degenerate stars in anti de Sitter space. We calculate the effect of the gravitational back-reaction using the Tolman-Oppenheimer-Volkoff equations, and determine the ”Chandrasekhar limit” beyond which the star undergoes...

Degenerate stars and gravitational collapse in AdS/CFT

We construct composite CFT operators from a large number of fermionic primary fields corresponding to states that are holographically dual to a zero temperature Fermi gas in AdS space. We identify a large N regime in which the fermions behave as free particles. In the hydrodynamic limit the Fermi gas forms a degenerate star with a radius determined by the Fermi level, and a mass...