Article
Physics, Particles & Fields
Andreas Karch, Zhu-Xi Luo, Hao-Yu Sun
Summary: This study explores entanglement entropy in 1+1 dimensional conformal field theories with interfaces from a holographic perspective, revealing that the location of the interface can affect the entanglement entropy, showing new patterns and universal relationships.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Francesco Bigazzi, Alessio Caddeo, Aldo L. Cotrone, Angel Paredes
Summary: The spectra of stochastic gravitational waves generated in cosmological first-order phase transitions are computed within strongly correlated theories with a dual holographic description. The study considers bubble collisions and sound waves arising from two types of first-order phase transitions and finds that the gravitational wave spectra may be within the sensitivity range of ground-based and space-based interferometers, as well as Pulsar Timing Arrays, depending on the model parameters. The research also explores characteristic spectra with double frequency peaks when two phase transitions occur at different critical temperatures.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Yue-Zhou Li, H. Lu, Liang Ma
Summary: In this paper, the holographic central charges and OPE coefficients in four-dimensional CFTs are derived using AdS gravity as an effective field theory, with a focus on their invariance under metric field redefinition and a hidden relation among the OPE coefficients. Furthermore, it is proven that a specific relation holds for massless AdS gravity constructed from the most general Riemann tensor invariants, demonstrating the consistency of the derived results.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Mike Blake, Hong Liu
Summary: This paper presents evidence for the hydrodynamic origin of chaos in maximally chaotic systems and discusses the hallmarks of such systems, including the suppression of exponential growth in commutator squares of generic few-body operators. The study suggests that the nature of operator scrambling in maximally chaotic systems is fundamentally different from non-maximally chaotic systems. Additionally, the paper explores a scenario for the existence of a maximally chaotic regime in non-maximally chaotic systems at sufficiently large distances.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Meer Ashwinkumar, Matthew Dodelson, Abhiram Kidambi, Jacob M. Leedom, Masahito Yamazaki
Summary: In this paper, we discuss ensemble averages of two-dimensional conformal field theories associated with an arbitrary indefinite lattice with integral quadratic form Q, and provide evidence that the holographic dual after the ensemble average is the three-dimensional Abelian Chern-Simons theory with kinetic term determined by Q. The resulting partition function can be written as a modular form expressed as a sum over the partition functions of Chern-Simons theories on lens spaces. For odd lattices, the dual bulk theory is a spin Chern-Simons theory, and several novel phenomena in this case are identified. The holographic duality prior to averaging is also discussed in terms of Maxwell-Chern-Simons theories.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Molly Kaplan, Donald Marolf
Summary: We study the action of Hubeny-Rangamani-Takayanagi (HRT) area operators on the covariant phase space and give a sharp argument for a precise result in a general theory of Einstein-Hilbert gravity coupled to matter. We find that this transformation is singular in the deep UV when the HRT surface is anchored to an asymptotically AdS boundary.
JOURNAL OF HIGH ENERGY PHYSICS
(2022)
Article
Physics, Particles & Fields
Pablo A. Cano, Angel J. Murcia, Alberto Rivadulla Sanchez, Xuao Zhang
Summary: We have conducted an extensive study on the holographic aspects of higher-derivative Einstein-Maxwell theories in any dimension. By introducing electromagnetic quasitopological gravities and imposing various physical constraints, we have analyzed charged black hole solutions, thermodynamic properties at finite chemical potential, shear viscosity to entropy density ratio, and charged Renyi entropies. Our results show the possibility of achieving zero viscosity to entropy density ratio and preserving the usual properties of Renyi entropies while satisfying the physical constraints.
JOURNAL OF HIGH ENERGY PHYSICS
(2022)
Article
Physics, Particles & Fields
Giorgos Anastasiou, Ignacio J. Araya, Robert B. Mann, Rodrigo Olea
Summary: In this study, the renormalization of Entanglement Entropy in holographic CFTs dual to Lovelock gravity is investigated. A new renormalization prescription for the Jacobson-Myers functional is proposed through the Kounterterm renormalization procedure, which effectively cancels divergences in the EE for spherical entangling surfaces. This method provides C-function candidates for odd and even dimensional CFTs dual to Lovelock gravity without requiring limiting Einstein behavior of the theory.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Xi Dong, Donald Marolf, Pratik Rath, Amirhossein Tajdini, Zhencheng Wang
Summary: This paper explores the Lorentz-signature spacetime geometry intrinsic to fixed-area states. It analyzes the general features of fixed-area state geometries, constructs explicit examples, and finds that the classical metrics are real at real times and have no conical singularities. However, at the quantum level, quantum fields in fixed-area states feature stronger divergences.
JOURNAL OF HIGH ENERGY PHYSICS
(2022)
Article
Physics, Particles & Fields
Qiang Wen
Summary: In this article, we introduce a new information theoretical quantity called balanced partial entanglement (BPE) for any bipartite mixed state. We discuss its relation with purifications and find that in holographic CFT2, BPE equals the area of the entanglement wedge cross section divided by 4G.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Alex May, Mark Van Raamsdonk
Summary: The paper explains approximating states of a holographic CFT by states of non-interacting BCFTs and reintroducing couplings to make wormholes traversable, creating an intermediate class of geometries.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Mohsen Alishahiha, Amin Faraji Astaneh, Ali Naseh
Summary: By employing the extended island formula, we computed the entanglement entropy of Hawking radiation for black hole solutions of certain gravitational models containing higher derivative terms. Our results showed that despite the non-unitarity of the corresponding gravitational models, the entropy followed the Page curve, thanks to the contribution of the island.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Laura Rado, Victor O. Rivelles, Renato Sanchez
Summary: In this work, we construct string backgrounds for Yang-Baxter deformations of the AdS4 x CP3 superstring generated by r-matrices satisfying the classical Yang-Baxter equation. The metric and NSNS two-form of the gravity dual corresponding to noncommutative and dipole deformations of ABJM theory, as well as a deformed background with Schrodinger symmetry, are obtained. The first two backgrounds can also be obtained by TsT transformations, while the last background leads to a new family of non-relativistic ABJM theories with Schrodinger symmetry.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Simon Caron-Huot
Summary: We investigated four-point correlators in an excited quantum state of a field theory and found that a Fourier transform can produce high-quality images of point-like bulk particles in holographic theories. The images reveal the geometry of their movement. For translation-invariant states, the bulk Einstein's equations can be described as local differential equations on correlator data. In non-holographic theories or states, the images are too blurry to extract bulk geometry. We confirmed this by applying formulas from conformal Regge theory to gauge theories at different couplings and the 3D Ising model.
JOURNAL OF HIGH ENERGY PHYSICS
(2023)
Article
Physics, Particles & Fields
Warren Carlson, Robert de Mello Koch, Minkyoo Kim
Summary: This paper constructs generating functions for operators dual to systems of giant gravitons with open strings attached. These operators have a bare dimension of order N, which makes the usual methods used to solve the planar limit not applicable. The generating functions are given as integrals over auxiliary variables, which symmetrize and antisymmetrize the indices of the fields. Our generating functions provide a simple construction of the Gauss graph operators previously obtained using a Fourier transform on a double coset, and they also offer a starting point for a systematic (1)(N) expansion and the action of the dilatation operator on these operators through a saddle point evaluation of the integral representation.
JOURNAL OF HIGH ENERGY PHYSICS
(2023)
Article
Astronomy & Astrophysics
Aaron Poole, Kostas Skenderis, Marika Taylor
CLASSICAL AND QUANTUM GRAVITY
(2019)
Article
Physics, Multidisciplinary
Georgios Katsianis, Ioannis Papadimitriou, Kostas Skenderis, Marika Taylor
PHYSICAL REVIEW LETTERS
(2019)
Article
Physics, Multidisciplinary
Adam Bzowski, Paul McFadden, Kostas Skenderis
PHYSICAL REVIEW LETTERS
(2020)
Article
Physics, Particles & Fields
Claudio Coriano, Luigi Delle Rose, Kostas Skenderis
Summary: Theories with generalised conformal structure exhibit similar properties to conformal field theories in lower dimensions, where the standard normalization constant is replaced by a function of the effective coupling constant g constructed from dimensionful parameters and the separation of operators. These theories play a role in holographic dualities involving non-conformal branes, and the phi(6) coupling, while irrelevant in the context of generalised conformal structure, has effects in the UV regime.
EUROPEAN PHYSICAL JOURNAL C
(2021)
Article
Physics, Particles & Fields
Georgios Katsianis, Ioannis Papadimitriou, Kostas Skenderis, Marika Taylor
Summary: The study provides a comprehensive analysis of supersymmetry anomalies in the Wess-Zumino model, discussing the anomalies and symmetry breaking caused by different multiplets of conserved currents. The research confirms the anomaly in Q-supersymmetry appearing in 4-point functions through explicit calculations and the action of regulators.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Multidisciplinary
Guido Cossu, Luigi Del Debbio, Andreas Juettner, Ben Kitching-Morley, Joseph K. L. Lee, Antonin Portelli, Henrique Bergallo Rocha, Kostas Skenderis
Summary: The study shows that superrenormalizable theories are nonperturbatively IR finite, with the coupling constant acting as an IR regulator. By a combination of methods including Markov Chain Monte Carlo simulations, frequentist and Bayesian data analysis, and considerations of an effective theory, evidence supporting this conclusion is gathered.
PHYSICAL REVIEW LETTERS
(2021)
Article
Physics, Multidisciplinary
Jose Manuel Penin, Kostas Skenderis, Benjamin Withers
Summary: In this study, we investigate the properties of strongly coupled mass-deformed CFT on a fixed de Sitter spacetime using holography. We elucidate the causal structure of the four-dimensional spacetime dual to the de Sitter invariant vacuum state and compute the correlation functions of the deformed-CFT stress tensor and scalar operator at each order of the mass deformation.
Article
Physics, Particles & Fields
Adam Bzowski, Paul McFadden, Kostas Skenderis
Summary: In this paper, we present a comprehensive discussion on the tree-level holographic 4-point functions of scalar operators in momentum space. We demonstrate that each Witten diagram satisfies the conformal Ward identities independently, making it a valid conformal correlator. Furthermore, we provide explicit formulas for evaluating Witten diagrams when certain conditions are met. Renormalization is necessary for these correlators and it leads to new conformal anomalies and beta functions. We also explore the idea of weight-shifting operators to link correlators of operators with different dimensions.
JOURNAL OF HIGH ENERGY PHYSICS
(2022)
Article
Physics, Particles & Fields
Raffaele Marotta, Kostas Skenderis, Mritunjay Verma
Summary: We examined the 3-point CFT correlators involving non-conserved spinning operators in momentum space. A general expression for the conformal Ward identities defining the 3-point functions involving two generic spin s non-conserved operators and a spin 1 conserved current was derived. Explicit expressions for the 3-point function were provided when the two non-conserved operators have spins 1 and 2 and generic conformal dimensions. The divergences appearing in these 3-point functions when the conformal dimensions of the two non-conserved operators coincide were also systematically analyzed.
JOURNAL OF HIGH ENERGY PHYSICS
(2023)
Article
Astronomy & Astrophysics
Enrico Parisini, Kostas Skenderis, Benjamin Withers
Summary: We generalize the embedding space formalism to conformal field theories (CFTs) on nontrivial states and curved backgrounds using the ambient metric of Fefferman and Graham. The construction of CFT n-point functions in these settings is based on appropriate geometric invariants of the ambient space. Exact agreement with holographic computations and expectations from thermal operator product expansions (OPEs) is found for two-point functions of thermal CFT, and the method is also applied to CFTs on squashed spheres with no prior results available, demonstrating its utility.
Article
Astronomy & Astrophysics
Maximo Banados, Ernesto Bianchi, Ivan Munoz, Kostas Skenderis
Summary: We have developed a systematic procedure for renormalizing quantum field theories in anti-de Sitter spacetime. UV infinities are regulated using a geodesic point-splitting method, while IR infinities are regulated by cutting off the radial direction. We define the renormalized theory by introducing Z factors, boundary counterterm action, and renormalization conditions.
Article
Astronomy & Astrophysics
Aaron Poole, Kostas Skenderis, Marika Taylor
Summary: In this paper, we discuss the definition of conserved quantities in asymptotically locally de Sitter spacetimes. We introduce the analog of holographic charges at future and past infinity and at other Cauchy surfaces, and explain the characteristics and changes of these charges.
Article
Astronomy & Astrophysics
Luigi Del Debbio, Elizabeth Dobson, Andreas Juttner, Ben Kitching-Morley, Joseph K. L. Lee, Valentin Nourry, Antonin Portelli, Henrique Bergallo Rocha, Kostas Skenderis
Summary: A nonperturbative determination of the energy-momentum tensor is crucial in understanding strongly coupled systems. The Wilson flow method is utilized to renormalize the energy-momentum tensor for a three-dimensional massless scalar field with a phi(4) interaction in the adjoint of SU(N) on the lattice, including numerical results for the mixing coefficient in the N = 2 theory.
Article
Physics, Particles & Fields
Adam Bzowski, Paul McFadden, Kostas Skenderis
Summary: The general solution of the conformal Ward identities for scalar n-point functions in momentum space and general dimension is found, which involves integrals over (n - 1)-simplices. The correlators exhibit a recursive structure when the function of cross ratios is a monomial.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Astronomy & Astrophysics
Horatiu Nastase, Kostas Skenderis