Article
Physics, Particles & Fields
Shao-Kai Jian, Brian Swingle
Summary: In this study, the entanglement transition in monitored Brownian SYK chains in the large-N limit is investigated. The steady state n-th Renyi entropy is found to saturate to the Page value in the n -> 1 limit without measurement. In the presence of measurements, the analytical continuation n -> 1 is performed using the cyclic symmetric solution. The result shows a continuous von Neumann entanglement entropy transition from volume-law to area-law occurs at the point of replica symmetry unbreaking as the monitoring rate increases.
JOURNAL OF HIGH ENERGY PHYSICS
(2023)
Article
Physics, Particles & Fields
Gaston Giordano, Nicolas Grandi, Adrian Lugo
Summary: The study investigates instabilities in strongly coupled metallic systems using a modified Pomeranchuk technique applied to weakly coupled fermions in a curved AdS bulk. The resulting unstable modes correspond to instabilities in the dual holographic metal. By exploring the phase diagram at zero temperature with varying couplings, the researchers find a wide region where the system is stable and localized around the origin of coupling space.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Ki-Seok Kim, Shinsei Ryu
Summary: By applying recursive renormalization group transformations to a scalar field theory, an effective quantum gravity theory with an emergent extra dimension is obtained. Dynamics of dual order-parameter field and metric tensor field originate from different effective interactions in the Gaussian level approximation. In the large N limit, quantum fluctuations of dynamical metric and dual scalar fields are suppressed, leading to a classical field theory in (D+1)-spacetime dimensions.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Jinwei Chu, Feiyu Deng, Yang Zhou
Summary: The study defines defect extremal surface by minimizing the Ryu-Takayanagi surface corrected by the quantum theory localized on the defect, and extends the results to higher dimensions. It is found that the entropy computed from bulk defect extremal surface is generally less than that from island formula in boundary low energy effective theory, suggesting a smaller entropy from the UV completion of island formula.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Feiyu Deng, Yu-Sen An, Yang Zhou
Summary: We propose a three-dimensional counterpart for Jackiw-Teitelboim gravity coupled with CFT2 bath based on partial reduction. The counterpart is classical AdS gravity with a defect brane having small fluctuation in the transverse direction. By treating the transverse fluctuation as a dilaton field, we derive the full Jackiw-Teitelboim gravity action. We demonstrate that the fine-grained entropy computed from the island formula precisely agrees with that computed from the defect extremal surface. Our construction provides a Lorentzian higher-dimensional counterpart for Jackiw-Teitelboim gravity glued to a bath, offering a framework to study problems like the black hole information paradox.
JOURNAL OF HIGH ENERGY PHYSICS
(2023)
Article
Physics, Particles & Fields
Aristomenis Donos, Christiana Pantelidou, Vaios Ziogas
Summary: In this study, holography was utilized to derive effective theories of fluctuations in spontaneously broken phases, with a focus on systems with finite temperature, chemical potential, magnetic field, and momentum relaxation where translations are broken. The hydrodynamic modes corresponding to coupled thermoelectric and density wave fluctuations were analytically constructed, revealing them to be purely diffusive in the system. Introduction of pinning for density waves resulted in some modes acquiring not only a gap, but also a finite resonance due to the presence of a magnetic field. Optical properties were studied and numerical checks of the analytical results were performed. An important outcome of the analysis was the identification of the correct current responsible for heat transport in the system.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Carlo Ewerz, Andreas Samberg, Paul Wittmer
Summary: In this study, holography was utilized to investigate the dynamics of a vortex-anti-vortex dipole in a strongly coupled superfluid in 2+1 dimensions. Numerical real-time simulations were used to track the evolution of vortices as they approached and annihilated each other. Universal trajectories of vortices were identified, while non-universal effects were attributed to numerical artifacts in vortex initialization. Additionally, the dependence of dynamics on superfluid temperature was explored.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Javier Mas, David Travieso Mayo
Summary: This article revisits the case of a real scalar field in global AdS4 under periodic driving. The authors address the issue of adiabatic preparation and deformation of a time-periodic solution corresponding to a Floquet condensate. They carefully study the case of driving close to the normal mode resonant frequencies and examine different slow protocols. The results show that traversing a normal mode frequency has different consequences depending on the sense of the frequency modulation.
JOURNAL OF HIGH ENERGY PHYSICS
(2023)
Article
Physics, Particles & Fields
Nicolas Grandi, Vladimir Juricic, Ignacio Salazar Landea, Rodrigo Soto-Garrido
Summary: Researchers constructed a holographic model that simulates the symmetry breaking pattern of a simple Dirac fermion model at zero chemical potential, and found that such a geometry is unstable towards a nematic phase, exhibiting an anomalous Hall effect and a Drude-like shift of its spectral weight.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Toan T. Nguyen, Tran Huu Phat
Summary: Within the framework of AdS/CFT duality, excited states of the conformal field in four-dimensional spacetime Einstein gravity are analytically investigated. The threshold chemical potential for excited condensate states is found to be discrete with equal spacing at T -> 0. This behavior holds even for low excited states, and is especially significant in the liquid phase of the black hole van der Waals-like phase transition. The continuous spectrum of excited states is missed in previous studies and should be carefully considered in AdS/CFT duality studies.
JOURNAL OF HIGH ENERGY PHYSICS
(2022)
Article
Physics, Particles & Fields
Yan Liu, Xin-Meng Wu
Summary: This study investigates the breakdown of diffusive hydrodynamics in holographic systems dual to neutral dilatonic black holes with extremal near horizon geometries conformal to AdS(2) x R-2. The research shows that by tuning the effective gauge coupling constant at low temperatures, different scaling behaviors of local equilibrium scales can be achieved, and the upper bound for the charge diffusion constant is always satisfied using the velocity and timescale of local equilibration from the pole collision.
JOURNAL OF HIGH ENERGY PHYSICS
(2022)
Article
Physics, Particles & Fields
Andrea Amoretti, Daniel Arean, Daniel K. Brattan, Luca Martinoia
Summary: Hydrodynamics and gauge/gravity are utilized to investigate magneto-transport in phases where translations are spontaneously broken. Analytic expressions and holographic models are provided to determine relevant transport coefficients and DC conductivities, with an excellent agreement between the two methodologies observed, demonstrating the effectiveness of holographic models in studying magneto-phonons.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Sergei Khlebnikov, Akhil Sheoran
Summary: This article investigates the relationship between the theory of N free Dirac fermions with a uniformly winding mass in two spacetime dimensions and the entanglement entropy in high-spin gravity.
JOURNAL OF HIGH ENERGY PHYSICS
(2022)
Article
Physics, Particles & Fields
Stefan Eccles, Willy Fischler, Tyler Guglielmo, Juan F. Pedraza, Sarah Racz
Summary: The study found that introducing mild nonlocality into otherwise local and chaotic quantum systems can increase the rate of information spreading, but in some cases these rates may be suppressed.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Aristomenis Donos, Polydoros Kailidis, Christiana Pantelidou
Summary: In this study, dissipation in holographic superfluids at finite temperature and zero chemical potential is investigated. By using analytic techniques, constitutive relations including the first non-trivial dissipative terms are derived, and transport coefficients are determined based on thermodynamic quantities and black hole horizon data. The breakdown of the hydrodynamic expansion is explicitly demonstrated by analyzing the behavior of these coefficients near the phase transition. Additionally, the resonant frequency and decay rate of the pseudo-Goldstone mode induced by introducing a perturbative symmetry breaking source are determined.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Mark Mezei, Silviu S. Pufu, Yifan Wang
JOURNAL OF HIGH ENERGY PHYSICS
(2019)
Article
Physics, Particles & Fields
Mark Mezei, Gabor Sarosi
JOURNAL OF HIGH ENERGY PHYSICS
(2020)
Article
Physics, Particles & Fields
Mark Mezei, Julio Virrueta
JOURNAL OF HIGH ENERGY PHYSICS
(2020)
Article
Physics, Multidisciplinary
Mark Mezei, Wilke van der Schee
PHYSICAL REVIEW LETTERS
(2020)
Article
Physics, Particles & Fields
Changha Choi, Mark Mezei, Gabor Sarosi
Summary: Pole skipping is a recently discovered subtle effect in the thermal energy density, determined by the stress tensor contribution to many-body chaos. In non-maximally chaotic theories, the true butterfly velocity is uB, and there exists a universal bound u(B) <= uB.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Changha Choi, Mark Mezei, Gabor Sarosi
Summary: Motivated by understanding quantum systems away from maximal chaos, the note derives a simple closed form expression for the fermion four point function of the large q SYK model valid at arbitrary temperatures and to leading order in 1/N. The result captures both large temperature, weakly coupled regime, and low temperature, nearly conformal, maximally chaotic regime. The derivation involves Sommerfeld-Watson resummation of an infinite series, recasting the four point function as a sum of three Regge poles, with the location determining the Lyapunov exponent that interpolates between zero and the maximal value as the temperature decreases.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Zohar Komargodski, Mark Mezei, Sridip Pal, Avia Raviv-Moshe
Summary: The paper discusses the constraints of spontaneously broken boost and dilatation symmetries in heavy states in Conformal Field Theories (CFTs), pointing out the existence of new low-lying primaries required by broken boost symmetries, and demonstrating these ideas in various states.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Gabriel Cuomo, Zohar Komargodski, Mark Mezei
Summary: In this study, we investigate the critical O(N) model under the influence of a localized external magnetic field. This model has the potential to be realized in quantum simulators and in certain liquid mixtures. We find that the external field triggers a defect Renormalization Group (RG) flow, resulting in a stable nontrivial defect Conformal Field Theory (DCFT) with g < 1 at long distances, in accordance with the g-theorem. Using the epsilon expansion and the large N limit, we make several predictions for the corresponding DCFT data. The analysis of the large N limit involves a new saddle point and recent advancements in AdS loop diagrams enable the study of fluctuations around it. Our results are consistent with Monte Carlo simulations and we propose several predictions that can be tested in the future.
JOURNAL OF HIGH ENERGY PHYSICS
(2022)
Article
Physics, Particles & Fields
Gabriel Cuomo, Mark Mezei, Avia Raviv-Moshe
Summary: In the study of operators with large internal charge in BCFTs with internal symmetries, a non-trivial relation between the scaling dimension of the lowest dimensional CFT and charged operators in BCFTs was found. Additionally, a superfluid effective field theory was constructed to systematically calculate the BCFT spectrum, and predictions from the EFT analysis were explicitly verified in specific examples. Furthermore, a systematic background field approach towards Ward identities in general boundary and defect conformal field theories was discussed, along with its relation to Noether's theorem in perturbative theories.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Cesar A. Agon, Mark Mezei
Summary: An effective membrane theory has been proposed to describe the hydrodynamic regime of entanglement dynamics for chaotic systems. By reformulating the membrane theory as a max flow problem, a max flow-min cut theorem is proved. In the context of holography, the relation between the max flow program dual to the membrane theory and the program dual to the holographic surface extremization prescription is explained, providing an explicit map from the membrane to the bulk.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Gabriel Cuomo, Zohar Komargodski, Mark Mezei, Avia Raviv-Moshe
Summary: This paper studies line defects with large quantum numbers in conformal field theories. It first considers spin impurities in a free scalar triplet and the Wilson-Fisher O(3) model and reveals a rich phase diagram. A new semiclassical approach is developed to obtain these results. For the Wilson-Fisher model, an alternative description is proposed to study large spin impurities. Additionally, the paper also investigates Wilson lines in large representations of N = 2 superconformal field theories.
JOURNAL OF HIGH ENERGY PHYSICS
(2022)
Article
Physics, Particles & Fields
Luca V. Iliesiu, Mark Mezei, Gabor Sarosi
Summary: Understanding the fate of semi-classical black hole solutions at very late times is an important open question in quantum gravity. In this paper, the authors provide a path integral definition of the volume of the black hole interior and study its evolution at arbitrarily late times. They find that, after a linear growth, the length of the interior saturates at a time and value that is exponentially large in the entropy of the black hole, which supports the complexity equals volume proposal.
JOURNAL OF HIGH ENERGY PHYSICS
(2022)
Article
Physics, Multidisciplinary
Ofer Aharony, Gabriel Cuomo, Zohar Komargodski, Mark Mezei, Avia Raviv-Moshe
Summary: We study the low-energy behavior of Wilson lines in conformal gauge theories and find that certain defect operators can become marginal, leading to interesting renormalization group flows and screening effects by charged fields. This screening phenomenon is universal in large enough representations of Wilson lines. We observe that fixed-point mergers are associated with the onset of the screening instability. By studying various applications, we show that the screening of Wilson lines can occur through dimensional transmutation or generation of large scales.
PHYSICAL REVIEW LETTERS
(2023)
Article
Physics, Multidisciplinary
Bruno Le Floch, Mark Mezei
Article
Astronomy & Astrophysics
Mark Mezei