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Collapse of Self-Interacting Scalar Field in Anti-de Sitter Space

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Communications in theoretical physics 2016年第3期65卷 329-334页

作者：蔡荣根季力伟杨润秋 State Key Laboratory of theoretical physics Institute of Theoretical PhysicsChinese Academy of Sciences

The gravitational collapse of a massless scalar field with a self-interaction term λφ~4 in anti-de Sitter space is *** numerically investigate the effect of the self-interaction term on the critical amplitudes,forming time of apparent horizon,stable island,and energy *** results show that a positiveλsuppresses the formation of black hole,while a negativeλenhances the *** define two susceptibilities to characterize the effect of the self-interaction on the black hole formation,and find that near the critical amplitude,there exists a universal scaling relation with the critical exponentα≈0.74 for the time of black hole formation.

关键词： AdS instability weakly turbulence self-interaction potential

Diffusion-Limited Aggregation with Polygon Particles

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Communications in theoretical physics 2012年第12期58卷 895-901页

作者：邓礼王延颋欧阳钟灿 State Key Laboratory of theoretical physics Institute of Theoretical Physics Chinese Academy of Sciences

Diffusion-limited aggregation （DLA） assumes that particles perform pure random walk at a finite tem- perature and aggregate when they come close enough and stick together. Although it is well known that DLA in two dimensions results in a ramified fractal structure, how the particle shape influences the formed morphology is still un- clear. In this work, we perform the off-lattice two-dimensional DLA simulations with different particle shapes of triangle, quadrangle, pentagon, hexagon, and octagon, respectively, and compare with the results for circular particles. Our results indicate that different particle shapes only change the local structure, but have no effects on the global structure of the formed fractal duster. The local compactness decreases as the number of polygon edges increases.

关键词： diffusion-limited aggregation polygon particles fractal cluster local compactness

Construction of AFLT States by Reflection Method and Recursion Formula

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Communications in theoretical physics 2014年第1期61卷 56-68页

作者：寿暴吴剑锋喻明 institute of theoretical physics Chinese Academy of Sciences institute of theoretical physics Department of Applied Mathematics and PhysicsBeijing University of Technology

The AFLT states|PY1,Y2has reflection symmetry,Sn|PY1,Y2=|PY2,Y2,nb=2P,where S is the screening *** state can be constructed using this reflect *** propose a recursion formula for this *** recursion formula is factoriz... 详细信息

关键词： AGT duality AFLT states reflection method recursion formula

One-Dimensional Steady Transport by Molecular Dynamics Simulation:Non-Boltzmann Position Distribution and Non-Arrhenius Dynamical Behavior

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Communications in theoretical physics 2014年第10期61卷 579-588页

作者：石锐王延颋 State Key Laboratory of theoretical physics Institute of Theoretical PhysicsChinese Academy of Sciences

A non-equilibrium steady state can be characterized by a nonzero but stationary flux driven by a static external force. Under a weak external force, the drift velocity is difficult to detect because the drift motion is feeble and submerged in the intense thermal diffusion. In this article, we employ an accurate method in molecular dynamics simulation to determine the drift velocity of a particle driven by a weak external force in a one-dimensional periodic potential. With the calculated drift velocity, we found that the mobility and diffusion of the particle obey the Einstein relation, whereas their temperature dependences deviate from the Arrhenius law. A microscopic hopping mechanism was proposed to explain the non-Arrhenius behavior. Moreover, the position distribution of the particle in the potential well was found to deviate from the Boltzmann equation in a non-equilibrium steady state. The non-Boltzmann behavior may be attributed to the thermostat which introduces an effective "viscous" drag opposite to the drift direction of the particle.

关键词： non-equilibrium steady state mobility self-diffusion hopping mechanism

Constraining the UT angle γ by CP violation parameters in B^0→π^＋π^-

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Chinese physics C 2016年第3期40卷 1-5页

作者：秦溱邹芝田李营吕才典 institute of High Energy physics Department of physics Yantai University State Key Laboratory of theoretical physics Institute of Theoretical PhysicsChinese Academy of Sciences State Key Laboratory of theoretical physics Institute of Theoretical Physics Chinese Academy of Sciences

We calculate the tree and penguin amplitudes in the B^0→π^＋^-ecay channel employing the perturbative QCD factorization approach. Using the amplitudes as input with the theoretical uncertainties sufficiently considered, we constrain the UT angle γ to 53°γ 70°, from the measurements of the CP violation parameters C_（π^＋^- and S_（π^＋^-in B^0→π^＋^- The U-spin breaking effect between B^0→π^＋^-nd B^0 s →K^＋K^-is estimated to be around 30%.

关键词： CP violation γ extraction B meson decay

Scalars and Neutral Fermions on the Background with Hyperscaling Violation

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Communications in theoretical physics 2013年第12期60卷 714-720页

作者：白楠方超高怡泓奇官布徐孝宝 State Key Laboratory of theoretical physics Institute of Theoretical Physics Chinese Academy of Sciences

We study the scalar and fermionic retarded Green＇s function on the background with hyperscMing violation by means of the prescriptions proposed in [J. High Eergy Phys. 09 （2002） 042; Fortsch. Phys. 57 （2009） 367]. For scalar field, we consider both massless and massive cases, and for spinor field, we further calculate the finite temperature correlator with the black hole background.

关键词： gauge string duality

Constraining Equation of State of Dark Matter:Including Weak Gravitational Lensing

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Chinese physics Letters 2015年第5期32卷 183-187页

作者：杨磊杨维强徐立昕 institute of theoretical physics School of Physics and Optoelectronic Technology Dalian University of Technology Dalian 116024 State Key Laboratory of theoretical physics Institute of Theoretical Physics Chinese Academy of Sciences Beijing 100190

Usually the equation of state （EoS） of dark matter is zero when it is cold, however there exists the possibility of a （effective） nonzero EoS of dark matter due to its decay and interaction with dark energy. In this work, we try to constrain the EoS of dark matter/JAdm using the currently available cosmic observations which include the geometrical and dynamical measurements. For the geometrical measurements, the luminosity distance of type Ia supernovae, the angular diameter distance and comoving sound horizon from baryon acoustic oscillations and the cosmic microwave background radiation will be employed. The data points from the redshift-space distortion and weak gravitational lensing will be taken as dynamical measurements. Using the Markov chain Monte Carlomethod, we obtain a very tight constraint on the-EoS of dark matter：wdm=0.0000532 ＋0.000692＋0.00136＋0.00183 -0.000686-0.00136-0.00177.

关键词： In Constraining Equation of State of Dark Matter:Including Weak Gravitational Lensing Planck

Solution Space Coupling in the Random K-Satisfiability Problem

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Communications in theoretical physics 2013年第9期60卷 363-374页

作者：曾颖周海军 State Key Laboratory of theoretical physics Institute of Theoretical PhysicsChinese Academy of Sciences

The random K-satisfiability （K-SAT） problem is very diffcult when the clause density is close to the satisfiability threshold. In this paper we study this problem from the perspective of solution space coupling. We divide a given difficult random K-SAT formula into two easy sub-formulas and let the two corresponding solution spaces to interact with each other through a coupling field x. We investigate the statistical mechanical property of this coupled system by mean field theory and computer simulations. The coupled system has an ergodicity-breaking （clustering） transition at certain critical value Xd of the coupling field. At this transition point, the mean overlap value between the solutions of the two solution spaces is very close to 1. The mean energy density of the coupled system at its clustering transition point is less than the mean energy density of the original K-SAT problem at the temperature-induced clustering transition point. The implications of this work for designing new heuristic K-SAT solvers are discussed.

关键词： constraint satisfaction spin glass clustering transition belief propagation solution space

Localization of gravitino field on f(R)-thick branes

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Science China(physics,Mechanics & Astronomy) 2018年第11期61卷 15-29页

作者： XiangNan Zhou YunZhi Du Hao Yu YuXiao Liu College of physics and Information Engineering Shanxi Normal University institute of theoretical physics Datong University Research Center of Gravitation and institute of theoretical physics Lanzhou University

In this paper, we consider the localization of a five-dimensional gravitino field on f(R)-thick branes. We obtain the coupled chiral equations of the Kaluza-Klein(KK) modes of gravitinos with the gauge condition Ψ_z= 0. The chiral equations of a gravitino's KK modes are found to be almost identical to those of the Dirac fermion. However, their chiralities are exactly opposite. The chiral KK modes of gravitinos could be localized in some types of f(R)-thick branes on introducing a coupling term. We investigate the localization of a gravitino on three types of f(R)-thick branes through a Yukawa-like coupling term with background scalar fields. It has been shown that all the KK modes of gravitinos cannot be localized in the pure geometric f(R)-thick branes by adding a five-dimensional gravitino mass term. However, for the f(R)-thick branes generated by one or two background scalar fields, only the left-or right-handed zero mode could be localized in the branes, and the massive KK resonant modes are the same for both left-and right-handed gravitinos despite their opposing chiralities. All these results are consistent with those of the five-dimensional Dirac fermion except their chiralities, which may be an important sign to distinguish the gravitino field and the Dirac fermion field.

关键词： Kaluza-Klein modes localization gravitino field f(R)-thick brane