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The holographic fermions dual to massive gravity

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Science China(Physics,Mechanics & Astronomy) 2016年第10期59卷 49-57页

作者： Li-Qing Fang[[ Xiao-Mei Kuang jian-pin wu School of Physics and Electronic Information Shangrao Normal UniversityShangrao 334000China Department of Physics and Astronomy Shanghai Jiao Tong UniversityShanghai 200240China Shanghai Key Laboratory of High Temperature Superconductors Shanghai 200444China Instituto de Fisica Pontificia Universidad Catolica de ValparaisoCasilla 4059ValparaisoChile Institute of Gravitation and Cosmology Department of PhysicsSchool of Mathematics and PhysicsBohai UniversityJinzhou 121013China

We investigate the properties of the spectral function of the fermionic operator in the field theory which is dual to a 4-dimensional massive gravity. We first study the Fermi surface and the dispersion relation in the dual boundary theory. We find that as the massive parameters is decreased, the Fermi momentum becomes lower and the low energy excitation near Fermi surface behaves more like non-Fermi liquid. Then, we introduce a dipole coupling in the bulk theory and explore the emergence of a gap in the fermionic spectral function. It is found that larger critical dipole coupling is needed to open the gap than that in Einstein gravity. Accordingly,in the field theory dual to massive gravity, it requires stronger negative dipole coupling to generate the marginal Fermi liquid.

关键词： holography duality AdS/CFT correspondence holographic fermions

Dynamics of k-essence in loop quantum cosmology

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Chinese Physics C 2021年第4期45卷 451-461页

作者： Jiali Shi jian-pin wu College of Physical Science and Technology Bohai UniversityJinzhou 121013China Center for Gravitation and Cosmology College of Physical Science and TechnologyYangzhou UniversityYangzhou 225009China

In this paper,we study the dynamics of k-essence in loop quantum cosmology(LQC).The study indicates that the loop quantum gravity(LQG)effect plays a key role only in the early epoch of the universe and is diluted in the later *** fixed points in LQC are basically consistent with those in standard Friedmann-Robertson-Walker(FRW)*** most of the attractor solutions,the stability conditions in L Q C are in agreement with those for the standard FRW *** some special fixed points,however,tighter constraints are imposed thanks to the LQG effect.

关键词： k-essence loop quantum cosmology dynamics of dark energy

Thermodynamics and weak cosmic censorship conjecture of an AdS black hole with a monopole in the extended phase space

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Chinese Physics C 2020年第5期44卷 133-139页

作者： Xin-Yun Hu Ke-jian He Xiao-Xiong Zeng jian-pin wu College of Economic and Management Chongqing Jiaotong UniversityChongqing 400074China Physics and Space College China West Normal UniversityNanchong 637000China Department of Mechanics Chongqing Jiaotong UniversityChongqing 400074China Center for Gravitation and Cosmology College of Physical Science and TechnologyYangzhou UniversityYangzhou 225009China

The first law of black hole thermodynamics has been shown to be valid in the extended phase ***,the second law and the weak cosmic censorship conjecture have not been investigated *** investigate the laws of thermodynamics and the weak cosmic censorship conjecture of an AdS black hole with a global monopole in the extended phase space in the case of charged particle *** is shown that the first law of thermodynamics is valid,while the second law is violated for the extremal and near-extremal black ***,we find that the weak cosmic censorship conjecture is valid only for the extremal black hole,and that it can be violated for the near-extremal black holes,which is different from the previous results.

关键词： weak cosmic censorship conjecture thermodynamics global monopole black holes

Informational properties of holographic Lifshitz field theory

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Chinese Physics C 2021年第6期45卷 176-187页

作者： Huajie Gong Peng Liu Guoyang Fu Xiao-Mei Kuang jian-pin wu Center for Gravitation and Cosmology College of Physical Science and TechnologyYangzhou UniversityYangzhou 225009China Department of Physics and Siyuan Laboratory Jinan UniversityGuangzhou 510632China

In this paper,we explore the properties of holographic entanglement entropy(HEE),mutual information(MI)and entanglement of purification(EoP)in holographic Lifshitz *** informational quantities exhibit some universal properties of holographic dual field *** most configuration parameters and temperatures,these informational quantities change monotonically with the Lifshitz dynamical critical exponent ***,we also observe some non-monotonic behaviors for these informational quantities in some specific spaces of configuration parameters and temperatures.A particularly interesting phenomenon is that a dome-shaped diagram emerges in the behavior of MI vs z,and correspondingly a trapezoid-shaped profile appears in that of EoP vs *** means that for some specific configuration parameters and temperatures,the system measured in terms of MI and EoP is entangled only in a certain intermediate range of z.

关键词： Lifshitz gravity black hole physics AdS/CMT

Optimal Risk Sharing for Maxmin Choquet Expected Utility Model

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Acta Mathematicae Applicatae Sinica 2024年第2期40卷 430-444页

作者： De-jian TIAN Shang-ri wu School of Mathematics China University of Mining and TechnologyXuzhou 221116China

This article analyzes the Pareto optimal allocations,agreeable trades and agreeable bets under the maxmin Choquet expected utility(MCEU)*** provide several useful characterizations for Pareto optimal allocations for risk averse *** derive the formulation descriptions for non-existence agreeable trades or agreeable bets for risk neutral *** build some relationships between ex-ante stage and interim stage on agreeable trades or bets when new information arrives.

关键词： maxmin Choquet expected utility model Pareto optimal allocation agreeable trade agreeable bet

Recent advances in ocular lubrication

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Friction 2024年第9期12卷 1929-1954页

作者： jianhua ZHANG Yunjuan SU jian wu Hongdong WANG School of Mechatronic Engineering and Automation and Key Laboratory of Advanced Display and System Application Ministry of EducationShanghai UniversityShanghai 200444China

The ocular lubrication,where the eyelid constantly slides on the curved corneal surface,is considered as one of primary lubrication systems in *** reliable lubrication conditions,sensitive ocular tissues remain intact from fatigue damage during spontaneous blink *** tear film,evenly filled between cornea and conjunctiva,is a biological fluid with dynamic adjustment ability,which provides superior lubrication with the friction coefficient of below ***,the lubrication failure may result in a variety of uncomfortable symptoms such as inflammatory reactions,tissue damage and neurological ***,it is essential to clarify the fundamental mechanism of ocular lubrication,which helps to alleviate and even recover from various ocular *** review firstly demonstrates that the ocular components,containing lipids and mucins,contribute to maintaining the lubrication stability of tear ***,the ocular lubrication state in various physiological environments and the physical effect on tear film dynamics are further *** typical applications,the therapeutic agents of dry eye syndrome and contact lens with superior lubrication effects are introduced and their lubrication mechanisms are ***,this review summarizes a series of the latest research inspired by ocular ***,this work will provide a valuable guidance on the theoretical research and extensive applications in the field of biological lubrication.

关键词： bio-tribology ocular lubrication tear film dry eye syndrome tear film dynamics

A novel and promising engineering application of carbon dots:Enhancing the chloride binding performance of cement

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Chinese Chemical Letters 2024年第6期35卷 409-416页

作者： wu-jian Long Yang Yu Chuang He Guangdong Provincial Key Laboratory of Durability for Marine Civil Engineering Key Lab of Coastal Urban Resilient InfrastructureMOECollege of Civil and Transportation EngineeringShenzhen UniversityShenzhen 518060China

Corrosion of reinforcement induced by chloride invasion is extensively considered as the dominating deterioration mechanism of reinforced concrete(RC)structures,leading to serious safety hazards and tremendous economic ***,it still lacks well dispersive and cost-efficient nanomaterials to improve the anti-chloride-corrosion ability of RC ***,specific carbon dots(CDs)with high dispersity and low cost are deliberately designed,successfully prepared by hydrothermal processing,and then firstly applied to immensely enhance chloride binding performance of cement,thereby contributing to suppressing the corrosion of ***,the tailored CDs are composed of the carbon core with highly crystalline sp^(2)C structures and oxygen-containing groups connecting on the carbon core;The typical equilibrium test confirms that with respect to that of the blank cement paste,the chloride binding capacity of cement paste involving 0.2 wt%(by weight of cement)CDs is increased by 109% after 14-day exposure to 3 mol/L Na Cl solution;according to comprehensive analyses of phase compositions,the chloride binding mechanism of CDs-modified cement is rationally attributed to the fact that the incorporation of CDs advances the formation of calcium silicate hydrate(C-S-H)gels and Friedel's salt(Fs),thus enormously enhancing the physically adsorbed and chemically bound chloride ions of cement *** work not only firstly provides a novel high-dispersity and low-cost nanomaterial toward the durability enhancement of RC structures,but also broadens the application of CDs in the field of engineering,conducing to stimulating their industrialization development.

关键词： Carbon dots Chloride binding Cement Chloride binding mechanism Friedel’s salt

Simulation of RFI Cancellation Using Subspace Projection Algorithm for PAF Receiver

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Research in Astronomy and Astrophysics 2024年第1期24卷 237-244页

作者： Peng wu jian Li Mao-Zheng Chen Xinjiang Astronomical Observatory Chinese Academy of SciencesUrumqi 830011China University of Chinese Academy of Sciences Beijing 100049China Xinjiang Key Laboratory of Microwave Technology Urumqi 830011China

The simulation of radio frequency interference(RFI) cancellation by applying a spatial filtering technique for phased array feed(PAF) is presented. In order to better reflect the characteristics of PAF, a new signal model is to add the coupling coefficient among elements of PAF to the conventional array signal model. Then the subspace projection(SP) algorithm is used to cancel RFI from the correlation matrix of the signal, and finally, the 2D power image is drawn. The power variation of signal-of-interest direction and RFI direction before and after using the SP algorithm is analyzed. The new signal model and simulation strategy can be used to test and verify the beamformer.

关键词： methods:analytical techniques:radar astronomy telescopes

Utility and Application of a Versatile Analytical Method for MMF Calculation in AC Machines

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CES Transactions on Electrical Machines and Systems 2024年第1期8卷 22-31页

作者： Ze-Zheng wu Robert Nilssen jian-Xin Shen IEEE the College of Electrical Engineering Zhejiang UniversityHangzhou 310027China the Department of Electric Energy Norwegian University of Science and TechnologyTrondheimNorwayand also affiliated with the College of Electrical EngineeringZhejiang UniversityHangzhou 310027China

A versatile analytical method(VAM) for calculating the harmonic components of the magnetomotive force(MMF) generated by diverse armature windings in AC machines has been proposed, and the versatility of this method has been established in early literature. However, its practical applications and significance in advancing the analysis of AC machines need further elaboration. This paper aims to complement VAM by augmenting its theory, offering additional insights into its conclusions, as well as demonstrating its utility in assessing armature windings and its application of calculating torque for permanent magnet synchronous machines(PMSM). This work contributes to advancing the analysis of AC machines and underscores the potential for improved design and performance optimization.

关键词： AC machine Analytical method Harmonic analysis MMF Magnetic field Torque calculation