Results for "Yuan Feng"

total 18773took 0.23s
Accretion and ejection in Sgr A*Feb 16 2010We review our current understanding to the accretion and ejection processes in Sgr A*. Roughly speaking, they correspond to the quiescent and flare states of the source respectively. The high-resolution {\it Chandra} observations to the gas at the Bondi ... More
Heavy Quarkonium Production in Single Transverse Polarized High Energy ScatteringJan 28 2008We formulate the single transverse spin asymmetry in heavy quarkonium production in lepton-nucleon and nucleon-nucleon collisions in the non-relativistic limit. We find that the asymmetry is very sensitive to the production mechanism. The final state ... More
Sivers Function in the MIT Bag ModelAug 14 2003The Sivers function, an asymmetric transverse-momentum distribution of the quarks in a transversely polarized nucleon, is calculated in the MIT bag model. The bag quark wave functions contain both $S$-wave and $P$-wave components, and their interference ... More
Luminous hot accretion disksSep 13 2000Dec 05 2000We find a new two-temperature hot branch of equilibrium solutions for stationary accretion disks around black holes. In units of Eddington accretion rate defined as $10L_{\rm Edd}/c^2$, the accretion rates to which these solutions correspond are within ... More
Accretion flows: the Role of the Outer Boundary ConditionJul 23 1999We investigate the influences of the outer boundary conditions(OBCs) on the structure of an optically thin accretion flow. We find that OBC plays an important role in determining the topological structure and the profiles of the surface density and temperature ... More
Generalized Parton Distributions at x->1Nov 22 2003Generalized parton distributions at large $x$ are studied in perturbative QCD approach. As $x\to 1$ and at finite $t$, there is no $t$ dependence for the GPDs which means that the active quark is at the center of the transverse space. We also obtain the ... More
Advection-dominated Accretion: From Sgr A* to other Low-luminosity AGNsJan 23 2007This paper reviews our current understanding of low-luminosity AGNs (LLAGNs) in the context of the advection-dominated accretion flow. The best investigated source, the supermassive black hole in our galactic center, Sgr A*, is emphasized since the physics ... More
Effect of the additional second neighbor hopping on the charge dynamics in the t-J modelMar 17 2002The effect of the additional second neighbor hopping t' on the charge dynamics of the t-J model in the underdoped regime is studied within the fermion-spin theory. The conductivity spectrum of the t-t'-J model shows the low-energy peak and unusual midinfrared ... More
Pseudogap effects on the charge dynamics in the underdoped copper oxide materialsMay 13 2002Within the t-J model, the charge dynamics of copper oxide materials in the underdoped regime is studied based on the fermion-spin theory. It is shown that both in-plane charge dynamics and c-axis charge dynamics are mainly governed by the scattering from ... More
Studying High Energy Final State Interactions by N/D MethodSep 07 1998Jan 26 1999We discuss the final state interaction effects at high energies via a multi-channel N/D method. We find that the 2 by 2 charge--exchange final state interactions typically contribute an enhancement factor of a few times $10^{-2}$ in the $B$ meson decay ... More
Observational evidence for AGNs feedback at parsec scaleMay 24 2011In a hot accretion flow, the radiation from the innermost region of the flow propagates outward and heats the electrons at large radii via Compton scattering. It has been shown in previous works that if the radiation is strong enough, $L\ga 2%L_{\rm Edd}$, ... More
Characterizing locally distinguishable orthogonal product statesJul 24 2007Bennett et al. \cite{BDF+99} identified a set of orthogonal {\em product} states in the $3\otimes 3$ Hilbert space such that reliably distinguishing those states requires non-local quantum operations. While more examples have been found for this counter-intuitive ... More
Acute Triangulations of the Cuboctahedral SurfaceSep 20 2012In this paper we prove that the surface of the cuboctahedron can be triangulated into 8 non-obtuse triangles and 12 acute triangles. Furthermore, we show that both bounds are the best possible.
On hybrid models of quantum finite automataJun 11 2012Mar 27 2014In the literature, there exist several quantum finite automata (QFA) models with both quantum and classical states. These models are of particular interest,as they show praiseworthy advantages over the fully quantum models in some nontrivial aspects. ... More
The Hardy-Rellich inequality and uncertainty principle on the sphereDec 17 2012Nov 11 2014Let $\Delta_0$ be the Laplace-Beltrami operator on the unit sphere $\mathbb{S}^{d-1}$ of $\mathbb{R}^d$. We show that the Hardy-Rellich inequality of the form $$ \int_{\mathbb{S}^{d-1}} \left | f (x)\right|^2 d\sigma(x) \leq c_d \min_{e\in \mathbb{S}^{d-1}} ... More
Single-Transverse Spin Asymmetries: From DIS to Hadronic CollisionsJul 22 2005Sep 28 2005We study single-spin asymmetries in semi-inclusive deep inelastic scattering with transversely polarized target. Based on the QCD factorization approach, we consider Sivers and Collins contributions to the asymmetries. We fit simple parameterizations ... More
Radio--X-ray Correlation and the "Quiescent State" of Black Hole SourcesNov 29 2004Apr 28 2005Recently a correlation between the radio and X-ray luminosities is found, $L_{\rm R}\propto L_{\rm X}^{0.7}$, in black hole sources including black hole candidates in our galaxy and active galactic nuclei. We first show that the correlation can be understood ... More
Model Checking Quantum Systems --- A SurveyJul 25 2018This article discusses the essential difficulties in developing model-checking techniques for quantum systems that are never present in model checking classical systems. It further reviews some early researches on checking quantum communication protocols ... More
Dark Matter Particle Explorer observations of high-energy cosmic ray electrons plus positrons and their physical implicationsJul 31 2018The DArk Matter Particle Explorer (DAMPE) is a satellite-borne, high-energy particle and $\gamma$-ray detector, which is dedicated to indirectly detecting particle dark matter and studying high-energy astrophysics. The first results about precise measurement ... More
Polynomial Approximation in Sobolev Spaces on the Unit Sphere and the Unit BallNov 12 2010This work is a continuation of the recent study by the authors on approximation theory over the sphere and the ball. The main results define new Sobolev spaces on these domains and study polynomial approximations for functions in these spaces, including ... More
Moduli of Smoothness and Approximation on the Unit Sphere and the Unit BallJul 28 2009Jan 13 2010A new modulus of smoothness based on the Euler angles is introduced on the unit sphere and is shown to satisfy all the usual characteristic properties of moduli of smoothness, including direct and inverse theorem for the best approximation by polynomials ... More
Energy Evolution for the Sivers Asymmetries in Hard ProcessesApr 18 2013Aug 12 2013We investigate the energy evolution of the azimuthal spin asymmetries in semi-inclusive hadron production in deep inelastic scattering (SIDIS) and Drell-Yan lepton pair production in pp collisions. The scale dependence is evaluated by applying an approximate ... More
Maximal function and Multiplier Theorem for Weighted Space on the Unit SphereMar 30 2007For a family of weight functions invariant under a finite reflection group, the boundedness of a maximal function on the unit sphere is established and used to prove a multiplier theorem for the orthogonal expansions with respect to the weight function ... More
Boundedness of projection operators and Cesàro means in weighted $L^p$ space on the unit sphereJun 06 2007For the weight function $\prod_{i=1}^{d+1}|x_i|^{2\k_i}$ on the unit sphere, sharp local estimates of the orthogonal projection operators are obtained and used to prove the convergence of the Ces\`aro $(C,\delta)$ means in the weighted $L^p$ space for ... More
Open Bisimulation for Quantum ProcessesJan 02 2012Quantum processes describe concurrent communicating systems that may involve quantum information. We propose a notion of open bisimulation for quantum processes and show that it provides both a sound and complete proof methodology for a natural extensional ... More
EigenNet: A Bayesian hybrid of generative and conditional models for sparse learningFeb 04 2011Feb 08 2011It is a challenging task to select correlated variables in a high dimensional space. To address this challenge, the elastic net has been developed and successfully applied to many applications. Despite its great success, the elastic net does not explicitly ... More
Long Range Correlation in Higgs Boson Plus Two Jets Production at the LHCApr 30 2016We study Higgs boson plus two high energy jets production at the LHC in the kinematics where the two jets are well separated in rapidity. The partonic processes are dominated by the t-channel weak boson fusion (WBF) and gluon fusion (GF) contributions. ... More
Nonmonotonic gap in the coexisting antiferromagnetic and superconducting state for electron-doped cuprate superconductorsOct 19 2005We argue that the experimentally observed nonmonotonic gap in electron-doped cuprates at optimal doping is the lowest quasiparticle excitation energy in the coexisting antiferromagnetic (AF) and superconducting (SC) state. The idea is implemented by studying ... More
Soft Gluon Resummations in Dijet Azimuthal Angular Correlations at the ColliderMay 05 2014We derive all order soft gluon resummation in dijet azimuthal angular correlation in hadronic collisions at the next-to-leading logarithmic level. The relevant coefficients for the Sudakov resummation factor, the soft and hard factors, are calculated. ... More
Superconductivity in doped two-leg ladder cupratesMar 22 2006May 20 2006Within the t-J ladder model, superconductivity with a modified d-wave symmetry in doped two-leg ladder cuprates is investigated based on the kinetic energy driven superconducting mechanism. It is shown that the spin-liquid ground-state at the half-filling ... More
Effect of the additional second neighbor hopping on the spin dynamics in the t-J modelJun 06 2000The effect of the additional second neighbor hopping t' on the spin dynamics in the t-J model is studied within the fermion-spin theory. Although the additional second neighbor hopping t' is systematically accompanied with the reduction of the dynamical ... More
Momentum and doping dependence of the electron spectrum and ($π$,0) feature in copper oxide materialsApr 18 2000The momentum and doping dependence of the electron spectrum of copper oxide materials in the underdoped regime is studied within the t-J model. It is shown that the pseudogap opens near ($\pi$,0) point in the Brillouin zone, and the electron dispersion ... More
NLO QCD Corrections to $B_c$-to-Charmonium Form FactorsMar 10 2011Apr 15 2012The $B_c(^1S_0)$ meson to S-wave Charmonia transition form factors are calculated in next-to-leading order(NLO) accuracy of Quantum Chromodynamics(QCD). Our results indicate that the higher order corrections to these form factors are remarkable, and hence ... More
Influence of the additional second neighbor hopping on the spin response in the t-J modelApr 18 2000Apr 27 2000The influence of the additional second neighbor hopping t' on the spin response of the t-J model in the underdoped and optimally doped regimes is studied within the fermion-spin theory. Although the additional second neighbor hopping t' is systematically ... More
On The Waiting Time for A M/M/1 Queue with ImpatienceApr 06 2017This paper focuses on the problem of modeling the correspondence pattern for ordinary people. Suppose that letters arrive at a rate $\lambda$ and are answered at a rate $\mu$. Furthermore, we assume that, for a constant $T$, a letter is disregarded when ... More
The Radiative Efficiency of Hot Accretion FlowsJul 12 2012Sep 03 2012Two significant progresses have been made in the past years on our understanding of hot accretion flows. One is that only a small fraction of accretion flow available at the outer boundary can finally falls onto the black hole while most of them is lost ... More
Dihadron Azimuthal Correlation from Collins Effect in Unpolarized Hadron CollisionsJan 01 2010We study the dihadron azimuthal correlation produced nearly back-to-back in unpolarized hadron collisions, arising from the product of two Collins fragmentation functions. Using the latest Collins fragmentation functions extracted from the global analysis ... More
Initial and Final State Interaction Effects in Small-x Quark DistributionsAug 26 2010We study the initial and final state interaction effects in the transverse momentum dependent parton distributions in the small-$x$ saturation region. In particular, we discuss the quark distributions in the semi-inclusive deep inelastic scattering, Drell-Yan ... More
Single Transverse-Spin Asymmetries at Large-xOct 18 2006The large-$x$ behavior of the transverse-momentum dependent quark distributions is analyzed in the factorization-inspired perturbative QCD framework, particularly for the naive time-reversal-odd quark Sivers function which is responsible for the single ... More
The Structure and Variability of Sagittarius A*: Zooming in to the Supermassive Black Hole at the Galactic CenterMar 04 2002The Galactic center provides a unique astrophysical laboratory for us to study various astrophysical processes. In this paper, we review and outline the latest results from observations of Sgr~A$^*$ in terms of source structure and variations in flux ... More
Enhanced Minijet Production in $A-A$ Collisions from Gluons with Large Transverse MomentaJan 11 2001Apr 25 2001We find supersaturation for the intrinsic gluon distribution of nuclei, i.e. the low $x$ unintegrated nuclear gluon distribution peaks at intermediate transverse momenta $k_t=Q_s$ and vanishes at zero $k_t$. Taking into account the intrinsic transverse ... More
BFKL and Sudakov Resummation in Higgs Boson Plus Jet Production with Large Rapidity SeparationJan 16 2018We investigate the QCD resummation for the Higgs boson plus a high $P_T$ jet production with large rapidity separations in proton-proton collisions at the LHC. The relevant Balitsky-Fadin-Kuraev-Lipatov (BFKL) and Sudakov logs are identified and resummed. ... More
Does the circularization radius exist or not for low angular momentum accretion?May 07 2014If the specific angular momentum of accretion gas at large radius is small compared to the local Keplerian value, one usually believes that there exists a "circularization radius" beyond which the angular momentum of accretion flow is almost a constant ... More
Polarizations of J/ψand ψ' in hadroproduction at Tevatron in the k_t factorization approachSep 19 2000May 13 2001We present a calculation for the polarizations of $J/\psi$ and $\psi'$ produced in the hadron collisions at the Fermilab Tevatron. Various color octet channels including ${}^1S_0^{(8)}$, ${}^3P_J^{(8)}$, and ${}^3S_1^{(8)}$ as well as contributions from ... More
A Note on the Paper $"$Poincaré Inequality on the Path Space of Poisson Point Processes"Sep 08 2010The priority of Liming Wu for the Poincar\'e inequality for birth-death processes on a Poisson space is announced.
Azimuthal asymmetry of J/Psi suppression in non-central heavy-ion collisionsFeb 06 2002Jul 09 2002The azimuthal asymmetry of $J/\psi$ suppression in non-central heavy-ion collisions is studied within a dynamic model of $J/\psi$ suppression in a deconfined partonic medium. Within this model, $J/\psi$ suppression in heavy-ion collisions is caused mainly ... More
Large transverse momentum direct photon production in the coherent diffractive processes at hadron collidersApr 06 1999Direct photon production at large transverse momentum in the coherent diffractive processes at hadron colliders is calculated in the two-gluon exchange model. We find that the amplitude for the production process is related to the differential off-diagonal ... More
High-$p_T$ $ψψ$ production as signals for Double Parton scattering at hadron collidersJun 09 1997Jul 18 1997We present an analysis of the \psi\psi production from double parton (DP) sacttering and single parton (SP) scattering in the large p_T region via color-octet gluon fragmentation. We find that at the Tevatron the DP \psi\psi production is at the edge ... More
Diffractive light quark jet and gluon jet production at hadron colliders in the two-gluon exchange modelJul 15 1999Massless diquark jet and gluon jet productions at large transverse momentum in the coherent diffractive processes at hadron colliders are studied in the two-gluon exchange parametrization of the Pomeron model. We use the helicity amplitude method to calculate ... More
Quark initiated coherent diffractive production of muon pair and W boson at hadron collidersNov 10 1998Sep 01 1999The large transverse momentum muon pair and W boson productions in the quark initiated coherent diffractive processes at hadron colliders are discussed under the framework of the two-gluon exchange parametrization of the Pomeron model. In this approach, ... More
Study of gossamer superconductivity and antiferromagnetism in the t-J-U modelSep 22 2004Sep 22 2004The d-wave superconductivity (dSC) and antiferromagnetism are analytically studied in a renormalized mean field theory for a two dimensional t-J model plus an on-site repulsive Hubbard interaction $U$. The purpose of introducing the $U$ term is to partially ... More
Electron correlation and impurity-induced quasiparticle resonance states in cuprate superconductorsNov 28 2013We theoretically study the quasiparticle resonance states around a nonmagnetic impurity in cuprate superconductors based on t-t'-J-U model. The purpose of introducing the Coulomb repulsive interaction U is to partially impose the double occupancy constraint ... More
Proton Spin Structure from Measurable Parton DistributionsFeb 13 2012Oct 17 2012We present a systematic study of the proton spin structure in terms of measurable parton distributions. For a transversely-polarizedproton, we derive a polarization sum rule from the leading generalized parton distributions appearing in hard exclusive ... More
Universal Non-perturbative Functions for SIDIS and Drell-Yan ProcessesJun 11 2014Mar 20 2015We update the well-known BLNY fit to the low transverse momentum Drell-Yan lepton pair productions in hadronic collisions, by considering the constraints from the semi-inclusive hadron production in deep inelastic scattering (SIDIS) from HERMES and COMPASS ... More
Resummation of High Order Corrections in Higgs Boson Plus Jet Production at the LHCFeb 25 2016We study the effect of multiple parton radiation to Higgs boson plus jet production at the LHC, by applying the transverse momentum dependent (TMD) factorization formalism to resum large logarithmic contributions to all orders in the expansion of the ... More
Doping and temperature dependence of incommensurate antiferromagnetism in underdoped lanthanum cupratesSep 04 2001The doping, temperature and energy dependence of the dynamical spin structure factors of the underdoped lanthanum cuprates in the normal state is studied within the t-J model using the fermion-spin transformation technique. Incommensurate peaks are found ... More
Energy Harvesting for Secure OFDMA SystemsSep 12 2014Energy harvesting and physical-layer security in wireless networks are of great significance. In this paper, we study the simultaneous wireless information and power transfer (SWIPT) in downlink orthogonal frequency-division multiple access (OFDMA) systems, ... More
On the Origin of Ultraviolet Emission and the Accretion Model of Low-luminosity AGNsNov 09 2010Low-luminosity active galactic nuclei (LLAGNs) are generally believed to be powered by an inner radiatively inefficient, advection-dominated accretion flow (ADAF), an outer truncated thin disk, and a jet. Maoz (2007) recently challenged this picture based ... More
Intrinsic Ferromagnetism in ElectrenesApr 10 2019We report intrinsic ferromagnetism in monolayer electrides or electrenes, in which excess electrons act as anions. Our first-principles calculations demonstrate that magnetism in such electron-rich two-dimensional (2D) materials originates from the anionic ... More
Quantum Privacy-Preserving PerceptronJul 31 2017With the extensive applications of machine learning, the issue of private or sensitive data in the training examples becomes more and more serious: during the training process, personal information or habits may be disclosed to unexpected persons or organisations, ... More
Quantum Privacy-Preserving Data AnalyticsFeb 14 2017Data analytics (such as association rule mining and decision tree mining) can discover useful statistical knowledge from a big data set. But protecting the privacy of the data provider and the data user in the process of analytics is a serious issue. ... More
Electronic and Transport Properties of Molecular Junctions under a Finite Bias: A Dual Mean Field ApproachNov 22 2013We show that when a molecular junction is under an external bias, its properties can not be uniquely determined by the total electron density in the same manner as the density functional theory (DFT) for ground state (GS) properties. In order to correctly ... More
The Perfect Distinguishability of Quantum OperationsAug 03 2009We provide a feasible necessary and sufficient condition for when an unknown quantum operation (quantum device) secretely selected from a set of known quantum operations can be identified perfectly within a finite number of queries, and thus complete ... More
An Equivalence of Entanglement-Assisted Transformation and Multiple-Copy Entanglement TransformationApr 07 2004Jan 06 2005We examine the powers of entanglement-assisted transformation and multiple-copy entanglement transformation. First, we find a sufficient condition of when a given catalyst is useful in producing another specific target state. As an application of this ... More
Transverse Polarization of the Nucleon in Parton PictureSep 14 2012The proton's transverse polarization structure is examined in terms of the Lorentz-covariant Pauli-Lubanski vector in QCD. We find that there are contributions from leading, subleading, and next-to-subleading partonic contributions in the light-front ... More
Low Transverse Momentum Heavy Quark Pair Production to Probe Gluon TomographySep 03 2013We derive the transverse momentum dependent (TMD) factorization for heavy quark pair production in deep inelastic scattering, where the total transverse momentum is much smaller than the invariant mass of the pair. The factorization is demonstrated at ... More
Drell-Yan Lepton Pair Azimuthal Asymmetry in Hadronic ProcessesJan 23 2009We study the azimuthal asymmetry in the Drell-Yan lepton pair production in hadronic scattering processes at moderate transverse momentum region, taking into account the contributions from the twist-three quark-gluon correlations from the unpolarized ... More
Convergence of energy-dependent incommensurate antiferromagnetic neutron scattering peaks to commensurate resonance in underdoped bilayer cupratesJun 12 2002The recently discovered coexistence of incommensurate antiferromagnetic neutron scattering peaks and commensurate resonance in underdoped YBa$_2$Cu$_3$O$_{6+x}$ is calling for an explanation. Within the t-J model, the doping and energy dependence of the ... More
Charge transport in underdoped bilayer cupratesMay 13 2003Within the t-J model, we study the charge transport in underdoped bilayer cuprates by considering the bilayer interaction. Although the bilayer interaction leads to the band splitting in the electronic structure, the qualitative behavior of the charge ... More
Modeling the hard states of three black hole candidatesMay 24 2010Jun 05 2010Simultaneous multiwavelength observations were recently performed for three black hole candidates --- SWIFT J1753.5-0127, GRO J1655-40 and XTE J1720-318. In this paper we test the accretion-jet model originally proposed to XTE J1118+480 by investigating ... More
On the Relation Between Mechanisms for Single-Transverse-Spin AsymmetriesNov 05 2007Jan 14 2008Recent studies have shown that two widely-used mechanisms for single-transverse-spin asymmetries based on either twist-three contributions or on transverse-momentum-dependent (Sivers) parton distributions become identical in a kinematical regime of overlap. ... More
Transverse Momentum Distribution Through Soft-Gluon Resummation in Effective Field TheoryJul 15 2005We study resummation of transverse-momentum-related large logarithms generated from soft-gluon radiations in soft-collinear effective field theory. The anomalous dimensions of the effective quark and gluon currents, an important ingredient for the resummation, ... More
Scheme dependence and Transverse Momentum Distribution interpretation of Collins-Soper-Sterman resummationMay 21 2015Following an earlier derivation by Catani-de Florian-Grazzini (2000) on the scheme dependence in the Collins-Soper-Sterman (CSS) resummation formalism in hard scattering processes, we investigate the scheme dependence of the Transverse Momentum Distributions ... More
Hunting the Gluon Orbital Angular Momentum at the Electron-Ion ColliderDec 07 2016Applying the connection between the parton Wigner distribution and orbital angular momentum (OAM), we investigate the probe of the gluon OAM in hard scattering processes at the planned electron-ion collider. We show that the single longitudinal target-spin ... More
Outflow from Hot Accretion FlowsOct 23 2012Numerical simulations of hot accretion flows have shown that the mass accretion rate decreases with decreasing radius. Two models have been proposed to explain this result. In the adiabatic inflow-outflow solution (ADIOS), it is thought to be due to the ... More
Ergodicity for Neutral Type SDEs with Infinite Length of MemoryMay 09 2018May 22 2018In this paper, the weak Harris theorem developed in \cite{HMS11} is illustrated by using a straightforward Wasserstein coupling, which implies the exponential ergodicity of the functional solutions to a range of neutral type SDEs with infinite length ... More
Transportation Cost Inequalities for Neutral Functional Stochastic EquationsMay 10 2012By using Girsanov transformation and martingale representation, Talagrand-type transportation cost inequalities, with respect to both the uniform and the $L^2$ distances on the global free path space, are established for the segment process associated ... More
QCD Factorization for Semi-Inclusive Deep-Inelastic Scattering at Low Transverse MomentumApr 21 2004We demonstrate a factorization formula for semi-inclusive deep-inelastic scattering with hadrons in the current fragmentation region detected at low transverse momentum. To facilitate the factorization, we introduce the transverse-momentum dependent parton ... More
An Accretion-Jet Model for Black Hole Binaries: Interpreting the Spectral and Timing Features of XTE J1118+480Jul 29 2004Nov 24 2004Multi-wavelength observations of the black hole X-ray binary XTE J1118+480 have offered abundant spectral and timing information about the source, and have thus provided serious challenges to theoretical models. We propose a coupled accretion-jet model ... More
Alternation in Quantum Programming: From Superposition of Data to Superposition of ProgramsFeb 20 2014We extract a novel quantum programming paradigm - superposition of programs - from the design idea of a popular class of quantum algorithms, namely quantum walk-based algorithms. The generality of this paradigm is guaranteed by the universality of quantum ... More
Condition and capability of quantum state separationJun 02 2005Jul 18 2005The linearity of quantum operations puts many fundamental constraints on the information processing tasks we can achieve on a quantum system whose state is not exactly known, just as we observe in quantum cloning and quantum discrimination. In this paper ... More
Partial Recovery of Quantum EntanglementApr 07 2004Feb 09 2007Suppose Alice and Bob try to transform an entangled state shared between them into another one by local operations and classical communications. Then in general a certain amount of entanglement contained in the initial state will decrease in the process ... More
Unambiguous discrimination between quantum mixed statesMar 20 2004Apr 07 2005We prove that the states secretly chosen from a mixed state set can be perfectly discriminated if and only if these states are orthogonal. The sufficient and necessary condition when nonorthogonal quantum mixed states can be unambiguously discriminated ... More
Relation Between Catalyst-assisted Entanglement Transformation and Multiple-copy TransformationDec 12 2003Oct 17 2006We show that in some cases, catalyst-assisted entanglement transformation cannot be implemented by multiple-copy transformation for pure states. This fact, together with the result we obtained in [R. Y. Duan, Y. Feng, X. Li, and M. S. Ying, Phys. Rev. ... More
Distribution-based Bisimulation and Bisimulation Metric in Probabilistic AutomataDec 16 2015Probabilistic automata were introduced by Rabin in 1963 as language acceptors. Two automata are equivalent if and only if they accept each word with the same probability. On the other side, in the process algebra community, probabilistic automata were ... More
On the origin of X-ray emission in some FR Is: ADAF or jet?Jun 28 2007We investigate the X-ray origin in FR Is using the radio, submillimetre, optical, and {\em Chandra} X-ray data of a small sample consisting of eight FR I sources. These sources are very dim, with X-ray luminosities $L_{\rm X}/L_{\rm Edd} \sim 10^{-4}-10^{-8}$ ... More
X-ray Spectral Variability of TeV Blazars during Rapid FlaresApr 25 2006May 08 2006The spectral energy distribution (SED) of TeV blazars peaks both at keV and TeV energies. The X-ray emission is generally believed to originate in the synchrotron emission from relativistic electrons (and positrons) in the jet of these sources, while ... More
Panoptic Edge DetectionJun 03 2019Pursuing more complete and coherent scene understanding towards realistic vision applications drives edge detection from category-agnostic to category-aware semantic level. However, finer delineation of instance-level boundaries still remains unexcavated. ... More
Asymptotic Log-Harnack Inequality and Applications for Stochastic Systems of Infinite MemoryOct 03 2017Sep 07 2018The asymptotic log-Harnack inequality is established for several different models of stochastic differential systems with infinite memory: non-degenerate SDEs, Neutral SDEs, semi-linear SPDEs, and stochastic Hamiltonian systems. As applications, the following ... More
Probing Parton Orbital Angular Momentum in Longitudinally Polarized NucleonJul 22 2012While the total orbital angular momentum (OAM) of a definite quark flavor in a longitudinally-polarized nucleon can be obtained through a sum rule involving twist-two generalized parton distribution (GPDs), its distribution as a function of parton momentum ... More
QCD Evolution of the Transverse Momentum Dependent CorrelationsDec 24 2008We study the QCD evolution for the twist-three quark-gluon correlation functions associated with the transverse momentum odd quark distributions. Different from that for the leading twist quark distributions, these evolution equations involve more general ... More
Limit Theorems for Additive Functionals of Path-Dependent SDEsApr 05 2019By using limit theorems of uniform mixing Markov processes and martingale difference sequences, the strong law of large numbers, central limit theorem, and the law of iterated logarithm are established for additive functionals of path-dependent stochastic ... More
Faster First-Order Methods for Stochastic Non-Convex Optimization on Riemannian ManifoldsNov 20 2018Nov 24 2018SPIDER (Stochastic Path Integrated Differential EstimatoR) is an efficient gradient estimation technique developed for non-convex stochastic optimization. Although having been shown to attain nearly optimal computational complexity bounds, the SPIDER-type ... More
Best polynomial approximation on the triangleNov 13 2017Let $E_n(f)_{\alpha,\beta,\gamma}$ denote the error of best approximation by polynomials of degree at most $n$ in the space $L^2(\varpi_{\alpha,\beta,\gamma})$ on the triangle $\{(x,y): x, y \ge 0, x+y \le 1\}$, where $\varpi_{\alpha,\beta,\gamma}(x,y) ... More
Gluon Distribution Functions and Higgs Boson Production at Moderate Transverse MomentumSep 07 2011We investigate the gluon distribution functions and their contributions to the Higgs boson production in pp collisions in the transverse momentum dependent factorization formalism. In addition to the usual azimuthal symmetric transverse momentum dependent ... More
Semi-inclusive Deep Inelastic Scattering at small xJun 08 2009Oct 30 2009We study the semi-inclusive hadron production in deep inelastic scattering at small $x$. A transverse momentum dependent factorization is found consistent with the results calculated in the small-$x$ approaches, such as the color-dipole framework and ... More
Asymmetric Di-jet Production in Polarized Hadronic CollisionsApr 09 2007Using the collinear QCD factorization approach, we study the single-transverse-spin dependent cross section Delta sigma(S_perp) for the hadronic production of two jets of momenta P_1=P+q/2 and P_2=-P+q/2. We consider the kinematic region where the transverse ... More
Probing Quark Distribution Amplitudes Through Generalized Parton Distributions at Large Momentum TransferSep 08 2003Sep 17 2003In the large momentum transfer limit, generalized parton distributions can be calculated through a QCD factorization theorem which involves perturbatively-calculable hard kernels and light-cone parton distribution amplitudes of hadrons. We illustrate ... More
Quark Imaging in the Proton Via Quantum Phase-Space DistributionsJul 31 2003We develop the concept of quantum phase-space (Wigner) distributions for quarks and gluons in the proton. To appreciate their physical content, we analyze the contraints from special relativity on the interpretation of elastic form factors, and examine ... More
Scale Dependence of Hadronic Wave Functions and Parton DensitiesMay 23 2002May 28 2002We study how the components of hadronic wave functions in light-cone quantization depend on the ultraviolet cut-off by relating them in a systematic way to the matrix elements of a class of quark-gluon operators between the QCD vacuum and the hadrons. ... More