Results for "Jian-Pin Wu"

total 22189took 0.12s
Holographic fermionic spectrum from Born-Infeld AdS black holeMay 18 2017In this letter, we systematically explore the holographic (non-)relativistic fermionic spectrum without/with dipole coupling dual to Born-Infeld anti-de Sitter (BI-AdS) black hole. For the relativistic fermionic fixed point, this holographic fermionic ... More
Transport phenomena and Weyl correction in effective holographic theory of momentum dissipationFeb 08 2019We construct a higher derivative theory involving an axionic field and the Weyl tensor in four dimensional spacetime. Up to the first order of the coupling parameters, the charged black brane solution with momentum dissipation in a perturbative manner ... More
Momentum dissipation and holographic transport without self-dualitySep 15 2016Oct 13 2016We implement the momentum dissipation introduced by spatial linear axionic fields in a holographic model without self-duality, broke by Weyl tensor coupling to Maxwell field, and study its response. It is found that for the positive Weyl coupling parameter ... More
The cosmological perturbation theory in loop cosmology with holonomy correctionsJan 08 2010May 21 2010In this paper we investigate the scalar mode of first-order metric perturbations over spatially flat FRW spacetime when the holonomy correction is taken into account in the semi-classical framework of loop quantum cosmology. By means of the Hamiltonian ... More
Thermal non-Gaussianity in holographic cosmologySep 19 2008Nov 03 2008Recently it has been shown that the thermal holographic fluctuations can give rise to an almost scale invariant spectrum of metric perturbations since in this scenario the energy is proportional to the area of the boundary rather than the volume. Here ... More
EM duality and Quasi-normal modes from higher derivatives with homogeneous disorderDec 30 2018We study the electromagnetic (EM) duality from $6$ derivative theory with homogeneous disorder. We find that with the change of the sign of the coupling parameter $\gamma_1$ of the $6$ derivative theory, the particle-vortex duality with homogeneous disorder ... More
Thermal non-Gaussianity in Near-Milne universeAug 17 2009Jan 31 2010The thermal non-Gaussianity in Near-Milne universe is investigated in this letter. Through classifying thermal fluctuations into two types, one characterized by a phase transition and the other without phase transition, we show that for fluctuations undergoing ... More
A note on entropic force and brane cosmologyJan 29 2010Feb 05 2010Recently Verlinde proposed that gravity is an entropic force caused by information changes when a material body moves away from the holographic screen. In this note we apply this argument to brane cosmology, and show that the cosmological equation can ... More
Particle motion and chaosJul 02 2018In this note, we explicitly illuminate that the velocity bound in the gravity corresponds to the chaos bound in the quantum system by studying the particle free falling in hyperscaling violating (HV) black brane. We also study the particle falling in ... More
Holographic superconductivity from higher derivative theoryOct 22 2017We construct a $6$ derivative holographic superconductor model in the $4$-dimensional bulk spacetimes, in which the normal state describes a quantum critical (QC) phase. The phase diagram $(\gamma_1,\hat{T}_c)$ and the condensation as the function of ... More
Quasi-normal modes of holographic system with Weyl correction and momentum dissipationApr 29 2018We study the charge response in complex frequency plane and the quasi-normal modes (QNMs) of the boundary quantum field theory with momentum dissipation dual to a probe generalized Maxwell system with Weyl correction. When the strength of the momentum ... More
Note on the butterfly effect in holographic superconductor modelsOct 23 2016Mar 17 2017In this note we remark that the butterfly effect can be used to diagnose the phase transition of superconductivity in a holographic framework. Specifically, we compute the butterfly velocity in a charged black hole background as well as anisotropic backgrounds ... More
Characterization of Quantum Phase Transition using Holographic Entanglement EntropyApr 17 2016Jun 19 2016The entanglement exhibits extremal or singular behavior near quantum critical points (QCPs) in many condensed matter models. These intriguing phenomena, however, still call for a widely accepted understanding. In this letter we study this issue in holographic ... More
Transport coefficients from hyperscaling violating black brane: shear viscosity and conductivityNov 10 2015Nov 16 2015We investigate two transport coefficients, shear viscosity and conductivity, in a non-relativistic boundary filed theory without hyperscaling symmetry, which is dual to a bulk charged hyperscaling violating black brane. Employing matching method, we obtain ... More
Holographic superconductors from the massive gravityApr 21 2014Sep 24 2014A holographic superconductor is constructed in the background of a massive gravity theory. In the normal state without condensation, the conductivity exhibits a Drude peak that approaches a delta function in the massless gravity limit as studied by David ... More
Holographic fermionic spectrum with Weyl correctionFeb 25 2018We study the ferminoic spectrum with Weyl correction, which exhibits the non-Fermi liquid behavior. Also, we find that both the height of the peak of the fermionic spectrum and the dispersion relation exhibit a nonlinearity with the variety of the Weyl ... More
Dynamic gap from holographic fermions in charged dilaton black branesJan 12 2012May 01 2012We report a dynamical formation of a (Mott) gap from holographic fermions. By coupling a fermion field with dipole action to the charged dilaton black branes with a Lifshitz like IR geometry and $AdS_{4}$ boundary, we find that when the dipole interaction ... More
Thermal transport and quasi-normal modes in Gauss-Bonnet-axions theoryFeb 06 2017May 03 2017We obtain the black brane solution in arbitrary dimensional Gauss-Bonnet-axions (GBA) gravity theory. And then the thermal conductivity of the boundary theory dual to this neutral black brane is explored. We find that the momentum dissipation suppresses ... More
A Novel Insulator by Holographic Q-latticesOct 19 2015Feb 19 2016We construct a bulk geometry with Q-lattice structure, which is implemented by two gauge fields and a coupling between the lattice and the Maxwell field. This gravity dual model can describe a novel insulator which exhibits some key features analogous ... More
Holographic incoherent transport in Einstein-Maxwell-dilaton GravityDec 04 2015Dec 01 2016Recent progress in the holographic approach makes it more transparent that each conductivity can be decomposed into the coherent contribution due to momentum relaxation and the incoherent contribution due to intrinsic current relaxation. In this paper ... More
Holographic Butterfly Effect at Quantum Critical PointsOct 09 2016Oct 23 2017When the Lyapunov exponent $\lambda_L$ in a quantum chaotic system saturates the bound $\lambda_L\leqslant 2\pi k_BT$, it is proposed that this system has a holographic dual described by a gravity theory. In particular, the butterfly effect as a prominent ... More
DC and Hall conductivity in holographic massive Einstein-Maxwell-Dilaton gravityApr 02 2015Aug 18 2015We investigate the holographic DC and Hall conductivity in massive Einstein-Maxwell-Dilaton (EMD) gravity. Two special EMD backgrounds are considered explicitly. One is dyonic Reissner-Nordstr$\ddot{o}$m-AdS (RN-AdS) geometry and the other one is hyperscaling ... More
Scalar Boundary Conditions in Hyperscaling Violating GeometryDec 11 2015We study the possible boundary conditions of scalar field modes in a hyperscaling violation(HV) geometry with Lifshitz dynamical exponent $z (z\geqslant1)$ and hyperscaling violation exponent $\theta (\theta\neq0)$. For the case with $\theta>0$, we show ... More
Anomaly freedom in perturbative models of Euclidean loop quantum gravitySep 12 2018Euclidean gravity provides an interesting test system for an analysis of cosmological perturbations in an effective Hamiltonian constraint with holonomy modifications from loop quantum gravity. This paper presents a discussion of scalar modes, with a ... More
A simple holographic model for spontaneous breaking of translational symmetryAug 09 2018Mar 18 2019It has been shown that holographic massive gravities can effectively realize the states with spontaneous breaking of translational symmetry in a homogenous manner. In this work, we consider a toy model of such category by adding a special gauge-axion ... More
Holography of electrically and magnetically charged black branesJul 20 2018Mar 12 2019We construct a new class of black brane solutions in Einstein-Maxwell-dilaton (EMD) theory, which is characterized by two parameters $a,b$. Based on the obtained solutions, we make detailed analysis on the ground state in zero temperature limit and find ... More
Holographic superconductor on a novel insulatorNov 21 2017Jan 09 2018We construct a holographic superconductor model, based on a gravity theory, which exhibits novel metal-insulator transitions. We investigate the condition for the condensation of the scalar field over the parameter space, and then focus on the superconductivity ... More
Holographic response from higher derivatives with homogeneous disorderMay 18 2017In this letter, we study the charge response from higher derivatives over the background with homogeneous disorder introduced by axions. We first explore the bounds on the higher derivatives coupling from DC conductivity and the anomalies of causality ... More
The Lifshitz black branes and DC transport coefficients in massive Einstein-Maxwell-dilaton gravitySep 09 2017Mar 13 2018We construct analytical Lifshitz massive black brane solutions in massive Einstein-Maxwell-dilaton gravity theory. We also study the thermodynamics of these black brane solutions and obtain the thermodynamical stability conditions. On the dual nonrelativistic ... More
Building a doped Mott system by holographyJul 09 2015Oct 23 2015We construct a holographic model in the framework of Q-lattices whose dual exhibits metal-insulator transitions. By introducing an interacting term between the Q-lattice and the electromagnetic field in bulk geometry, we find such kind of transition can ... More
Dynamically generated gap from holography in the charged black brane with hyperscaling violationNov 20 2014May 04 2015We holographically investigate the effects of a dipole coupling between a fermion field and a $U(1)$ gauge field on the dual fermionic sector in the charged gravity bulk with hyperscaling violation. We analytically study the features of the ultraviolet ... More
Entanglement of Purification in Holographic SystemsFeb 06 2019The holographic entanglement of purification (EoP) in AdS$_{4}$ and AdS-RN black hole backgrounds is studied. We develop an algorithm to compute the EoP for bipartite configuration with infinitely long strips. The temperature behavior of EoP is revealed ... More
Chaos from the ring string in Gauss-Bonnet black hole in $AdS_5$ spaceMay 14 2014By the Poincare sections, the dynamical behaviors of the ring string in the AdS-Gauss-Bonnet (AdS-GB) black hole are studied. A threshold value of the Gauss-Bonnet (GB) parameter $\lambda$ are found by the numerical method, below which the behavior of ... More
Quintessence reconstruction of the new agegraphic dark energy modelMay 04 2008May 08 2008In this paper we implement the new agegraphic dark energy model with quintessence field. We demonstrate that the new agegraphic evolution of the universe can be described completely by a single quintessence field. Its potential as a function of the quintessence ... More
The Stückelberg Holographic Superconductors with Weyl correctionsJan 12 2012In this letter we construct the St\"{u}ckelberg holographic superconductor with Weyl corrections. Under such corrections, the Weyl coupling parameter $\gamma$ plays an important role in the order of phase transitions and the critical exponents of second ... More
The pseudo-gap phase and the duality in holographic fermionic system with dipole coupling on Q-latticeFeb 19 2016We classify the different phases by the "pole-zero mechanism" for a holographic fermionic system which contains a dipole coupling with strength $p$ on a Q-lattice background. A complete phase structure in $p$ space can be depicted in terms of Fermi liquid, ... More
Bouncing universe from a modified dispersion relationSep 28 2009Nov 19 2009In this paper we argue that modified Friedmann equations with a bounce solution can be derived from a modified dispersion relation by employing a thermodynamical description of general relativity on the apparent horizon.
Holographic transports from Born-Infeld electrodynamics with momentum dissipationMay 21 2018Jun 15 2018We construct the Einstein-axions AdS black hole from Born-Infeld electrodynamics. Various DC transport coefficients of the dual boundary theory are computed. The DC electric conductivity depends on the temperature, which is a novel property comparing ... More
Weyl corrections to diffusion and chaos in holographyOct 22 2017Apr 23 2018Using holographic methods in the Einstein-Maxwell-dilaton-axion (EMDA) theory, it was conjectured that the thermal diffusion in a strongly coupled metal without quasi-particles saturates an universal lower bound that is associated with the chaotic property ... More
Entanglement of Purification in Holographic SystemsFeb 06 2019Mar 18 2019The holographic entanglement of purification (EoP) in AdS$_{4}$ and AdS-RN black hole backgrounds is studied. We develop an algorithm to compute the EoP for bipartite configuration with infinitely long strips. The temperature behavior of EoP is revealed ... More
Holographic Lattice in Einstein-Maxwell-Dilaton GravitySep 18 2013Sep 25 2013We construct an ionic lattice background in the framework of Einstein-Maxwell-dilaton theory in four dimensional space time. The optical conductivity of the dual field theory on the boundary is investigated. Due to the lattice effects, we find the imaginary ... More
Holographic Metal-Insulator Transition in Higher Derivative GravityJun 25 2016Jan 12 2017We introduce a Weyl term into the Einstein-Maxwell-Axion theory in four dimensional spacetime. Up to the first order of the Weyl coupling parameter $\gamma$, we construct charged black brane solutions without translational invariance in a perturbative ... More
Analytical study of the holographic superconductor from higher derivative theoryFeb 19 2019Feb 23 2019In this paper, we analytically study the holographic superconductor models with the high derivative (HD) coupling terms. Using the Sturm-Liouville (SL) eigenvalue method, we perturbatively calculate the critical temperature. The analytical results are ... More
Thermal fluctuations in viscous cosmologyJan 28 2010Mar 28 2010In this paper we investigate the power spectrum of thermal fluctuations in very early stage of viscous cosmology. When the state parameter as well as the viscous coefficient of a barotropic fluid is properly chosen, a scale invariant spectrum with large ... More
Anisotropic Fermi surface from holographySep 22 2014Jun 13 2015We investigate the probe holographic fermions by using an anisotropic charged black brane solution. We derive the equation of motion of probe bulk fermions with one Fermi momentum along the anisotropic and one along the isotropic directions. We then numerically ... More
Holographic fermionic system with dipole coupling on Q-latticeOct 27 2014Dec 28 2014We construct a holographic model for a fermionic system on Q-lattice and compute the spectral function in the presence of a dipole coupling. Both key features of doped Mott insulators, the dynamical generation of a gap and spectral weight transfer, are ... More
The 3+1 holographic superconductor with Weyl correctionsOct 10 2010Feb 16 2011In this paper we study $3+1$ holographic superconductors with Weyl corrections. We find that the critical temperature of a superconductor with Weyl corrections increases as we amplify the Weyl coupling parameter $\gamma$, indicating the condensation will ... More
Holographic Superconductor on Q-latticeOct 24 2014Feb 15 2015We construct the simplest gravitational dual model of a superconductor on Q-lattices. We analyze the condition for the existence of a critical temperature at which the charged scalar field will condense. In contrast to the holographic superconductor on ... More
Holographic Entanglement Entropy Close to Quantum Phase TransitionsFeb 12 2015Apr 25 2016We investigate the holographic entanglement entropy (HEE) of a strip geometry in four dimensional Q-lattice backgrounds, which exhibit metal-insulator transitions in the dual field theory. Remarkably, we find that the HEE always displays a peak in the ... More
Fermionic phase transition induced by the effective impurity in holographyJul 11 2015Nov 22 2015We investigate the holographic fermionic phase transition induced by the effective impurity in holography, which is introduced by massless scalar fields in Einstein-Maxwell-massless scalar gravity. We obtain a phase diagram in $(\alpha, T)$ plane separating ... More
Revisiting Spectral Graph Clustering with Generative Community ModelsSep 14 2017Oct 05 2017The methodology of community detection can be divided into two principles: imposing a network model on a given graph, or optimizing a designed objective function. The former provides guarantees on theoretical detectability but falls short when the graph ... More
On Some Applications of Group Representation Theory to Algebraic Problems Related to the Congruence Principle for Equivariant MapsJun 08 2017Given a finite group $G$ and two unitary $G$-representations $V$ and $W$, possible restrictions on Brouwer degrees of equivariant maps between representation spheres $S(V)$ and $S(W)$ are usually expressed in a form of congruences modulo the greatest ... More
A network centrality method for the rating problemMar 05 2014We propose a new method for aggregating the information of multiple reviewers rating multiple products. Our approach is based on the network relations induced between products by the rating activity of the reviewers. We show that our method is algorithmically ... More
StegNet: Mega Image Steganography Capacity with Deep Convolutional NetworkJun 17 2018Traditional image steganography often leans interests towards safely embedding hidden information into cover images with payload capacity almost neglected. This paper combines recent deep convolutional neural network methods with image-into-image steganography. ... More
On spurious regressions with trending variablesJun 16 2016This paper examines three types of spurious regressions where both the dependent and independent variables contain deterministic trends, stochastic trends, or breaking trends. We show that the problem of spurious regression disappears if the trend functions ... More
The Stückelberg Holographic Superconductors in Constant External Magnetic FieldJun 02 2010Jul 08 2010We investigate the St\"{u}ckelberg holographic superconductor in present of the constant external magnetic field. We observe that a critical value of magnetic field exists as the cases in usual holographic superconductor. Furthermore, we find that the ... More
Some properties of the holographic fermions in an extremal charged dilatonic black holeAug 31 2011We study the properties of the Green's functions of the fermions in the extremal charged dilatonic black hole proposed by Gubser and Rocha [Phys. Rev. D \textbf{81}, 046001 (2010)]. We find that many properties seem to be in agreement with that of Fermi ... More
Holographic fermions in charged Gauss-Bonnet black holeMar 21 2011Aug 01 2011We study the properties of the Green's functions of the fermions in charged Gauss-Bonnet black hole. What we want to do is to investigate how the presence of Gauss-Bonnet coupling constant $\alpha$ affects the dispersion relation, which is a characteristic ... More
Fast Incremental von Neumann Graph Entropy Computation: Theory, Algorithm, and ApplicationsMay 30 2018The von Neumann graph entropy (VNGE) facilitates the measure of information divergence and distance between graphs in a graph sequence and has successfully been applied to various network learning tasks. Albeit its effectiveness, it is computationally ... More
Effective Simulation of Quantum Entanglement using Classical Fields Modulated with Pseudorandom Phase SequencesFeb 24 2015Mar 14 2015An effective simulation of quantum entanglement is presented using classical fields modulated with n pseudorandom phase sequences (PPSs) that constitute a n2^n-dimensional Hilbert space with a tensor product structure. Applications to classical fields ... More
The effect of clusterings on the equilibrium states of local majority-rule: Occurrence probability and robustnessJan 02 2012The equilibrium states associated with the local majority-rule are divided into three classes, the states of system-wide coordination, the trapped states, and the states of period-2. The effect of clustering coefficient on the occurrence probability of ... More
Characterizing the process of reaching consensus for social systemsJun 28 2011A novel way of characterizing the process of reaching consensus for a social system is given. The foundation of the characterization is based on the theorem which states that the sufficient and necessary condition for a system to reach the state of consensus ... More
Multiple Periodic Solutions for $Γ$-symmetric Newtonian SystemsDec 23 2016The existence of periodic solutions in $\Gamma$-symmetric Newtonian systems $\ddot{x}=-\nabla f(x)$ can be effectively studied by means of the $(\Gamma\times O(2))$-equivariant gradient degree with values in the Euler ring $U(\Gamma\times O(2))$. In this ... More
Strongly Liftable Schemes and the Kawamata-Viehweg Vanishing in Positive Characteristic IIIJan 05 2013Aug 01 2013A smooth scheme X over a field k of positive characteristic is said to be strongly liftable over W_2(k), if X and all prime divisors on X can be lifted simultaneously over W_2(k). In this paper, we first deduce the Kummer covering trick over W_2(k), which ... More
Anomaly freedom of the vector modes with holonomy corrections in perturbative Euclidean loop quantum gravitySep 13 2012Feb 10 2013We study the perturbation of the effective Hamiltonian constraint with holonomy correction from Euclidean loop quantum gravity. The Poisson bracket between the corrected Hamiltonian constraint and the diffeomorphism constraint is derived for vector modes. ... More
Dynamics of tachyon field in spatially curved FRW universeMar 09 2010Mar 16 2010The dynamics of a tachyon field plus a barotropic fluid is investigated in spatially curved FRW universe. We perform a phase-plane analysis and obtain scaling solutions accompanying with a discussion on their stability. Furthermore, we construct the form ... More
Range-Renewal Structure in Continued FractionsMay 09 2013Let $\omega=[a_1, a_2, \cdots]$ be the infinite expansion of continued fraction for an irrational number $\omega \in (0,1)$; let $R_n (\omega)$ (resp. $R_{n, \, k} (\omega)$, $R_{n, \, k+} (\omega)$) be the number of distinct partial quotients each of ... More
Non-Abelian toplogical superconductors from topological semimetals and related systems under superconducting proximity effectJul 21 2011Jan 11 2013Non-Abelian toplogical superconductors are characterized by the existence of {zero-energy} Majorana fermions bound in the quantized vortices. This is a consequence of the nontrivial bulk topology characterized by an {\em odd} Chern number. It is found ... More
From topological strings to minimal modelsApr 08 2015Aug 06 2015We glue four refined topological vertices to obtain the building block of 5D $U(2)$ quiver instanton partition functions. We take the 4D limit of the result to obtain the building block of 4D instanton partition functions which, using the AGT correspondence, ... More
Spontaneous rectification and absolute negative mobility of inertial Brownian particles induced by gaussian potentials in steady laminar flowsFeb 24 2019We study the transport of inertial Brownian particles in steady laminar flows in the presence of two-dimensional Gaussian potentials. Through extensive numerical simulations, it is found that the transport is sensitively dependent on the external constant ... More
An Entropy-based Pruning Method for CNN CompressionJun 19 2017This paper aims to simultaneously accelerate and compress off-the-shelf CNN models via filter pruning strategy. The importance of each filter is evaluated by the proposed entropy-based method first. Then several unimportant filters are discarded to get ... More
The LAMOST Complete Spectroscopic Survey of Pointing Area (LaCoSSPAr) in the Southern Galactic Cap I. The Spectroscopic Redshift CatalogOct 11 2017We present a spectroscopic redshift catalog from the LAMOST Complete Spectroscopic Survey of Pointing Area (LaCoSSPAr) in the Southern Galactic Cap (SGC), which is designed to observe all sources (Galactic and extra-galactic) by using repeating observations ... More
Calogero-Sutherland model in interacting fermion picture and explicit construction of Jack statesOct 31 2011Nov 04 2011The 40-year-old Calogero-Sutherland (CS) model remains a source of inspirations for understanding 1d interacting fermions. At $\beta=1, \text{or}0$, the CS model describes a free non-relativistic fermion, or boson theory, while for generic $\beta$, the ... More
AutoPruner: An End-to-End Trainable Filter Pruning Method for Efficient Deep Model InferenceMay 23 2018Jan 17 2019Channel pruning is an important family of methods to speed up deep model's inference. Previous filter pruning algorithms regard channel pruning and model fine-tuning as two independent steps. This paper argues that combining them into a single end-to-end ... More
Quiver Matrix Mechanics for IIB String Theory (II): Generic Dual Tori, Fractional Matrix Membrane and $SL(2,\integer)$ DualityFeb 25 2004May 19 2004With the deconstruction technique, the geometric information of a torus can be encoded in a sequence of orbifolds. By studying the Matrix Theory on these orbifolds as quiver mechanics, we present a formulation that (de)constructs the torus of {\em generic ... More
Spin Susceptibility and Helical Magnetic Orders at the Edges/Surfaces of Topological Insulators Due to Fermi Surface NestingDec 06 2010Apr 08 2011We study spin susceptibility and magnetic order at the edges/surfaces of two-dimensional and three-dimensional topological insulators when the Fermi surface is nested. We find that due to spin-momentum locking as well as time-reversal symmetry, spin susceptibility ... More
Learning Effective Binary Visual Representations with Deep NetworksMar 08 2018Although traditionally binary visual representations are mainly designed to reduce computational and storage costs in the image retrieval research, this paper argues that binary visual representations can be applied to large scale recognition and detection ... More
A Macdonald refined topological vertexJan 30 2017Jun 01 2017We consider the refined topological vertex of Iqbal et al, as a function of two parameters (x, y), and deform it by introducing Macdonald parameters (q, t), as in the work of Vuletic on plane partitions, to obtain 'a Macdonald refined topological vertex'. ... More
The Parallel Knowledge Gradient Method for Batch Bayesian OptimizationJun 14 2016Apr 22 2018In many applications of black-box optimization, one can evaluate multiple points simultaneously, e.g. when evaluating the performances of several different neural network architectures in a parallel computing environment. In this paper, we develop a novel ... More
Holographic incoherent transport in Einstein-Maxwell-Dilaton GravityDec 04 2015Dec 15 2015Recent progress in holographic approach makes it more transparent that each conductivity can be decomposed into the coherent contribution due to momentum relaxation and the incoherent contribution due to intrinsic current relaxation. In this paper we ... More
Holographic fermions in charged dilaton black branesMar 03 2012Feb 10 2013By imposing the relativistic boundary term and Lorentz violating that in the dilatonic black brane with a Lifshitz like IR geometry and $AdS_4$ boundary, we study the properties of the spectral functions of the fermions. We find that in the two fixed ... More
Holographic Butterfly Effect at Quantum Critical PointsOct 09 2016When the Lyapunov exponent $\lambda_L$ in a quantum chaotic system saturates the bound $\lambda_L\leqslant 2\pi k_BT$, it is proposed that this system has a holographic dual described by a gravity theory. In particular, the butterfly effect as a prominent ... More
A simple holographic model for spontaneous breaking of translational symmetryAug 09 2018Oct 19 2018It has been shown that holographic massive gravities can effectively realize the states with spontaneous breaking of translational symmetry in a homogenous manner. In this work, we consider a toy model of such category by adding a special gauge-axion ... More
On the permanental nullity and matching number of graphsMar 10 2016For a graph $G$ with $n$ vertices, let $\nu(G)$ and $A(G)$ denote the matching number and adjacency matrix of $G$, respectively. The permanental polynomial of $G$ is defined as $\pi(G,x)={\rm per}(Ix-A(G))$. The permanental nullity of $G$, denoted by ... More
Distributed Clock Skew and Offset Estimation in Wireless Sensor Networks: Asynchronous Algorithm and Convergence AnalysisJul 10 2016In this paper, we propose a fully distributed algorithm for joint clock skew and offset estimation in wireless sensor networks based on belief propagation. In the proposed algorithm, each node can estimate its clock skew and offset in a completely distributed ... More
Network-Wide Distributed Carrier Frequency Offsets Estimation and CompensationJul 10 2016In this paper, we propose a fully distributed algorithm for frequency offsets estimation in decentralized systems. With the proposed algorithm, each node estimates its frequency offsets by local computations and limited exchange of information with its ... More
Discretization-free Knowledge Gradient Methods for Bayesian OptimizationJul 20 2017Jul 26 2017This paper studies Bayesian ranking and selection (R&S) problems with correlated prior beliefs and continuous domains, i.e. Bayesian optimization (BO). Knowledge gradient methods [Frazier et al., 2008, 2009] have been widely studied for discrete R&S problems, ... More
Holography of electrically and magnetically charged black branesJul 20 2018Aug 07 2018We construct a new class of black brane solutions in Einstein-Maxwell-dilaton (EMD) theory, which is characterized by two parameters $a,b$. Based on the obtained solutions, we make detailed analysis on the ground state in zero temperature limit and find ... More
Note on the butterfly effect in holographic superconductor modelsOct 23 2016In this note we remark that the butterfly effect can be used to diagnose the phase transition of superconductivity in a holographic framework. Specifically, we compute the butterfly velocity in a charged black hole background as well as anisotropic backgrounds ... More
Fluctuations in Gene Regulatory Networks as Gaussian Colored NoiseOct 23 2009Dec 22 2009The study of fluctuations in gene regulatory networks is extended to the case of Gaussian colored noise. Firstly, the solution of the corresponding Langevin equation with colored noise is expressed in terms of an Ito integral. Then, two important lemmas ... More
Discrete Adversarial Attacks and Submodular Optimization with Applications to Text ClassificationDec 01 2018Apr 04 2019Adversarial examples are carefully constructed modifications to an input that completely change the output of a classifier but are imperceptible to humans. Despite these successful attacks for continuous data (such as image and audio samples), generating ... More
Scalable Spectral Clustering Using Random Binning FeaturesMay 25 2018Aug 11 2018Spectral clustering is one of the most effective clustering approaches that capture hidden cluster structures in the data. However, it does not scale well to large-scale problems due to its quadratic complexity in constructing similarity graphs and computing ... More
Learning Segmentation Masks with the Independence PriorNov 12 2018Nov 13 2018An instance with a bad mask might make a composite image that uses it look fake. This encourages us to learn segmentation by generating realistic composite images. To achieve this, we propose a novel framework that exploits a new proposed prior called ... More
Dynamical Instability of Holographic QCD at Finite DensityApr 01 2010Nov 19 2010In this paper we study the dynamical instability of Sakai-Sugimoto's holographic QCD model at finite baryon density. In this model, the baryon density, represented by the smeared instanton on the worldvolume of the probe D8-\overline{D8} mesonic brane, ... More
Quantum Fourier Transform in a Decoherence-Free SubspaceSep 19 2004Quantum Fourier transform is of primary importance in many quantum algorithms. In order to eliminate the destructive effects of decoherence induced by couplings between the quantum system and its environment, we propose a robust scheme for quantum Fourier ... More
Lifting to cluster-tilting objects in higher cluster categoriesOct 19 2008Dec 29 2008In this note, we consider the $d$-cluster-tilted algebras, the endomorphism algebras of $d$-cluster-tilting objects in $d$-cluster categories. We show that a tilting module over such an algebra lifts to a $d$-cluster-tilting object in this $d$-cluster ... More
Phase space and quark mass effects in neutrino emissions in a color superconductorMay 09 2006Jun 30 2006We study the phase space for neutrino emissions with massive quarks in direct Urca processes in normal and color superconducting quark matter. We derive in QCD and the NJL model the Fermi momentum reduction resulting from Fermi liquid properties which ... More
Joule heating and thermoelectric properties in short single-walled carbon nanotubes: electron-phonon interaction effectAug 30 2011Nov 19 2011The electron-phonon interaction (EPI) effect in single-walled carbon nanotube is investigated by the nonequilibrium Green's function approach within the Born approximation. Special attention is paid to the EPI induced Joule heating phenomenon and the ... More
Fast and Quality-Guaranteed Data Streaming in Resource-Constrained Sensor NetworksNov 28 2008In many emerging applications, data streams are monitored in a network environment. Due to limited communication bandwidth and other resource constraints, a critical and practical demand is to online compress data streams continuously with quality guarantee. ... More
Divergence-free H(div)-conforming hierarchical bases for magnetohydrodynamics (MHD)Oct 20 2012Jan 31 2013In order to solve the magnetohydrodynamics (MHD) equations with a $\mathbf{\mathcal{H}}(\mathbf{div})$-conforming element, a novel approach is proposed to ensure the exact divergence-free condition on the magnetic field. The idea is to add on each element ... More