Article
Astronomy & Astrophysics
Horatiu Nastase, Jacob Sonnenschein
Summary: In this paper, we study T(T) over bar deformations in pp waves obtained from gravity duals. We find that the deformation of AdS(5) x S-5 must correspond to some dipole theory, and we also obtain the spin chain Hamiltonian for the deformed world sheet string in AdS(5) x S-5 pp wave. Furthermore, we discover that the deformed spin chain Hamiltonian corresponds to an equivalent Berenstein-Maldacena-Nastase (BMN) sector of N = 4 super Yang-Mills.
Article
Astronomy & Astrophysics
Alex May, David Wakeham
Summary: The research argues that quantum computations with inputs and outputs distributed in spacetime impose constraints on entanglement in holographic theories, leading to the connected wedge theorem. By extending this work to AdS/BCFT context with an end-of-the-world brane, a new connected wedge theorem is discovered. This theorem is applied to brane models of black holes, showing the relationship between formation of islands in the Ryu-Takayanagi formula and causal features of the ambient spacetime.
CLASSICAL AND QUANTUM GRAVITY
(2021)
Article
Multidisciplinary Sciences
Stephan Rosswog, Peter Diener, Francesco Torsello
Summary: Gravitational wave observation has become an important part of astronomy, and numerical relativity simulations are essential for interpreting such observations. Our recently developed numerical relativity code SPHINCS_BSSN is capable of simulating neutron star mergers and has shown noticeable effects of varying exponents on gravitational wave amplitude and dynamic ejecta. High-velocity ejecta components have been observed, suggesting their potential role in early precursor and afterglow of kilonova emission.
Article
Physics, Multidisciplinary
Anastasia A. Golubtsova, Marina K. Usova
Summary: In this study, we investigate holographic RG flows in a 3d supergravity model using the methods of dynamical system theory. By reducing the gravity equations of motion to an autonomous dynamical system, we identify equilibrium points and analyze their stability. We also reconstruct asymptotic solutions near critical points, which consist of two types: asymptotically AdS metrics and hyperscaling violating metrics. Furthermore, we describe possible RG flows between an unstable (saddle) UV fixed point and a stable (stable node) IR fixed point, as well as analyze bifurcations in the model.
EUROPEAN PHYSICAL JOURNAL PLUS
(2023)
Article
Physics, Particles & Fields
Yan-Qing Zhao, Song He, Defu Hou, Li Li, Zhibin Li
Summary: We study the rotation effects of hot and dense QCD matter using the gauge/gravity duality. By introducing angular velocity, we investigate the thermodynamic quantities for the rotating system and observe that the critical temperature and baryon chemical potential decrease with increasing angular velocity. We construct a 3-dimensional phase diagram of the QCD matter in terms of temperature, baryon chemical potential, and angular velocity, and also consider the gravitational model of the SU(3) pure gluon system with rotation.
JOURNAL OF HIGH ENERGY PHYSICS
(2023)
Article
Physics, Particles & Fields
Xin Jiang, Peng Wang, Houwen Wu, Haitang Yang
Summary: In the context of dS3/CFT2, a timelike entanglement entropy defined by the renormalization group flow is proposed and found to match exactly with the length of a timelike geodesic in dS3. The counterpart of this timelike entanglement entropy in AdS(3) is a spacelike one that extends into the bulk of AdS(3). This discovery indicates the existence of precisely three entanglement entropies in both AdS(3)/CFT2 and dS(3)/CFT2, providing sufficient information to reconstruct the three-dimensional bulk geometry.
JOURNAL OF HIGH ENERGY PHYSICS
(2023)
Article
Physics, Particles & Fields
Chanyong Park, Gitae Kim, Ji-seong Chae, Jae-Hyuk Oh
Summary: In this study, we investigate the holographic entanglement entropy in 5-dimensional charged black brane geometry derived from Einstein-SU(2)Yang-Mills theory in asymptotically AdS space. The system undergoes a second order phase transition near the critical point, where a spatial component of the Yang-Mills fields appears. We obtain analytic solutions of holographic entanglement entropies for wide and thin slabs and a cylinder. The entanglement entropies near the critical point exhibit scaling behavior and we propose a new order parameter based on the difference between entanglement entropies in isotropic and anisotropic phases.
JOURNAL OF HIGH ENERGY PHYSICS
(2023)
Article
Physics, Particles & Fields
Matteo Baggioli, Sera Cremonini, Laura Early, Li Li, Hao-Tian Sun
Summary: We investigate the impact of rotational symmetry breaking on the computation of the shear viscosity to entropy ratio in a holographic p-wave superfluid model. By studying the interplay between explicit and spontaneous symmetry breaking, we derive a horizon formula for η/s that is applicable even in the presence of rotational breaking and agrees well with numerical data. Despite the competition between explicit and spontaneous symmetry breaking, η/s always reaches a constant value at zero temperature, which is above the Kovtun-Son-Starinets (KSS) bound. This contrasts with previous holographic anisotropic models exhibiting a power-law vanishing of η/s at small temperatures due to different near-horizon geometry properties in the extremal limit.
JOURNAL OF HIGH ENERGY PHYSICS
(2023)
Article
Physics, Particles & Fields
R. Loganayagam, Mukund Rangamani, Julio Virrueta
Summary: We analyze real-time thermal correlation functions of conserved currents in holographic field theories using the grSK geometry and demonstrate its efficacy by carefully analyzing the wave equations in AdS black hole backgrounds. We identify the branch points of the solutions and show that the appearance of apparent singular points does not correspond to any interesting physical features in higher-point functions. We also argue that the Schwinger-Keldysh collapse and KMS conditions continue to hold even in the presence of such singularities.
JOURNAL OF HIGH ENERGY PHYSICS
(2023)
Article
Physics, Multidisciplinary
Tamas Gombor
Summary: This article highlights the significance of long-range spin chains in the gauge-string duality and generalizes the transfer matrices of integrable medium-range spin chains to long-range models. The introduced transfer matrices define conserved charges for each length of the spin chain, providing a definition for integrable finite-size long-range spin chains with the inclusion of wrapping corrections in their spectrum.
PHYSICAL REVIEW LETTERS
(2022)
Article
Physics, Particles & Fields
A. Moradpouri, S. A. Jafari, Mahdi Torabian
Summary: We propose a gravity dual for a quantum material with a tilted Dirac cone in 2+1 dimensions. The electrons in this many-body system are strongly coupled, forming a Dirac fluid, and can be described hydrodynamically. Holographic techniques are used to compute the thermodynamic variables and hydrodynamic transports of a fluid on the boundary of an asymptotically anti de Sitter spacetime with a boosted black hole in the bulk. We find deviations from the normal Dirac fluid in these materials due to the tilt of the Dirac cone, including a reduced shear viscosity to entropy density ratio and violation of the KSS bound. This prediction can be experimentally tested in two-dimensional quantum materials with tilted Dirac cone, such as organic α-(BEDT-TTF)(2)I-3 and 8Pmmn borophene.
JOURNAL OF HIGH ENERGY PHYSICS
(2023)
Article
Physics, Particles & Fields
Aristomenis Donos, Polydoros Kailidis
Summary: In this paper, we study the nearly critical behaviour of holographic superfluids at finite temperature and chemical potential in their probe limit. By using analytic techniques in the bulk, we derive an effective theory for the long wavelength limit of the gapless and pseudo-gapped modes, and compute the complex dissipative kinetic transport coefficient in terms of thermodynamics and black hole horizon data. We analyze the corresponding modes and argue that the dispersion relations are discontinuous between the normal and the broken phase at finite density. We compare and contrast our results with earlier numerical work.
JOURNAL OF HIGH ENERGY PHYSICS
(2022)
Article
Physics, Particles & Fields
Aristomenis Donos, Polydoros Kailidis
Summary: This article derives the leading dissipative corrections of holographic superfluids at finite temperature and chemical potential by employing newly developed techniques to study dissipative effects in the hydrodynamic limit of holographic theories. The results show that all three bulk viscosities exhibit singular behavior close to the critical point.
JOURNAL OF HIGH ENERGY PHYSICS
(2022)
Article
Physics, Particles & Fields
Markus A. G. Amano, Mike Blake, Casey Cartwright, Matthias Kaminski, Anthony P. Thompson
Summary: We investigate the connection between many-body quantum chaos and energy dynamics in holographic quantum field theory states associated with the Myers-Perry-AdS(5) black hole. By exploiting the enhanced symmetry of these black holes, we provide a more straightforward analysis of pole-skipping compared to previous studies on the Kerr-AdS(4) solution. We prove the existence of pole-skipping in the energy density Green's function of the dual quantum field theory when the spatial profile of energy fluctuations satisfies the shockwave equation governing the form of the out-of-time-ordered correlator (OTOC). We also establish the relationship between the Lyapunov exponent, butterfly velocity, and the locations of pole-skipping points in the energy response for operator configurations on Hopf circles in the large black hole limit. Furthermore, we demonstrate numerically that the dispersion relations of sound modes in the energy response pass through these pole-skipping locations.
JOURNAL OF HIGH ENERGY PHYSICS
(2023)
Article
Physics, Particles & Fields
Aristomenis Donos, Christiana Pantelidou
Summary: Second order phase transitions are driven by an order parameter that becomes trivial at the critical point. At the same time, collective excitations involving the amplitude of the order parameter develop a gap that smoothly closes to zero at criticality. We develop analytical techniques to study the Higgs mode in holographic systems undergoing continuous phase transitions at finite temperature and chemical potential, allowing us to examine the linear response of the system at energy scales of the order of the gap. We express the Green's functions of scalar operators in terms of thermodynamic quantities and a single transport coefficient determined by the black hole horizon data.
JOURNAL OF HIGH ENERGY PHYSICS
(2022)
Article
Physics, Multidisciplinary
Christopher Herzog, Kuo-Wei Huang, Kristan Jensen
PHYSICAL REVIEW LETTERS
(2018)
Article
Physics, Particles & Fields
Christopher P. Herzog, Youngshin Kim
JOURNAL OF HIGH ENERGY PHYSICS
(2018)
Article
Physics, Particles & Fields
Jorge Casalderrey-Solana, Christopher P. Herzog, Ben Meiring
JOURNAL OF HIGH ENERGY PHYSICS
(2019)
Article
Physics, Particles & Fields
Christopher P. Herzog, Itamar Shamir
JOURNAL OF HIGH ENERGY PHYSICS
(2019)
Article
Physics, Multidisciplinary
Christopher P. Herzog, Itamar Shamir
PHYSICAL REVIEW LETTERS
(2020)
Article
Physics, Particles & Fields
Rajesh Kumar Gupta, Christopher P. Herzog, Imtak Jeon
JOURNAL OF HIGH ENERGY PHYSICS
(2020)
Article
Physics, Particles & Fields
Christopher P. Herzog, Nozomu Kobayashi
JOURNAL OF HIGH ENERGY PHYSICS
(2020)
Article
Physics, Particles & Fields
Christopher P. Herzog, Kuo-Wei Huang, Dmitri V. Vassilevich
JOURNAL OF HIGH ENERGY PHYSICS
(2020)
Review
Physics, Multidisciplinary
Roberto Emparan, Christopher P. Herzog
REVIEWS OF MODERN PHYSICS
(2020)
Article
Physics, Particles & Fields
Christopher P. Herzog, Abhay Shrestha
Summary: This paper introduces a practical tool for investigating two-point correlation functions in defect conformal field theory and provides an alternative method for dealing with complex tensor situations. The paper also includes examples and analyzes constraints arising from conservation and equations of motion.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Christopher P. Herzog, Itamar Shamir
Summary: This study delves into the two point functions of marginal operators with the stress tensor and displacement operator in three dimensions, revealing the boundary anomaly and confirming agreement with the anomaly effective action. It also presents the anomaly effective action linking the Euler density term to the one point function anomaly for a higher dimensional conformal field theory with a four dimensional defect, extending previous results for two dimensional defects.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Christopher P. Herzog, Vladimir Schaub
Summary: In the context of boundary conformal field theory, a sum rule is derived that relates the two and three point functions of the displacement operator. For four dimensional conformal field theory with a three-dimensional boundary, this sum rule further relates the two boundary contributions to the anomaly in the trace of the stress tensor.
JOURNAL OF HIGH ENERGY PHYSICS
(2022)
Article
Physics, Particles & Fields
Adam Chalabi, Christopher P. Herzog, Andy O'Bannon, Brandon Robinson, Jacopo Sisti
Summary: Motivated by quantum information and classification of quantum field theories, this study examines Conformal Field Theories (CFTs) in spacetime dimension d >= 5 with conformally-invariant spatial boundaries (BCFTs) or 4-dimensional conformal defects (DCFTs). The boundary or defect contributions to the Weyl anomaly are determined using a standard algorithm, and the central charges characterizing the BCFTs or DCFTs are calculated. In addition, several parity-even and parity-odd terms are discovered, and the impact of the parity-even central charges on physical observables are demonstrated.
JOURNAL OF HIGH ENERGY PHYSICS
(2022)
Article
Physics, Particles & Fields
Christopher P. Herzog, Abhay Shrestha
Summary: In this paper, we consider a free Maxwell field in four dimensions in the presence of a codimension two defect. We find that only generalized free fields can appear in the defect operator product expansion of the bulk Maxwell field, and the correlation functions of these defect operators can be evaluated using Wick's Theorem.
JOURNAL OF HIGH ENERGY PHYSICS
(2022)
Article
Materials Science, Multidisciplinary
Vir B. Bulchandani, Benjamin Hsu, Christopher P. Herzog, S. L. Sondhi
Summary: Quantum spin liquids are topological states of matter that emerge in frustrated quantum magnets at low temperatures, exhibiting emergent gauge fields and fractionalized quasiparticles, with enhanced global symmetries. The study shows that the emergent gauge and symmetry structure in spin liquids result in a variety of additional hydrodynamic modes compared to high-temperature paramagnetic phases. A hydrodynamic regime for the internal U(1) gauge field common to both states is identified, characterized by slow diffusion of the internal transverse photon.