29,661 research outputs found

    Quark rotation asymmetry and baryon magnetic moments

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    Quark rotation asymmetry is proposed in calculating baryon magnetic moments. After taking into account interactions enforced on constituent quarks, assumed to be linear and Coulomb potentials, respectively, and the quark rotation asymmetry, we fit the theoretical values, based on two more hypotheses and several other reasonable assumptions, of baryon magnetic moments with those from experiments. The good fitting results show the necessity of the consideration of quark rotation asymmetry within baryon.Comment: 7 pages, submitted to Nuovo Cimento

    A new hierarchy of avalanches observed in Bak-Sneppen evolution model

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    A new quantity, average fitness, is introduced in Bak-Sneppen evolution model. Through this new quantity, a new hierarchy of avalanches is observed in the evolution of Bak-Sneppen model. An exact gap equation, governing the self-organization of the model, is presented. It is found that the self-organized threshold of the new quantity can be exactly obtained. Two basic exponents, avalanche distribution and avalanche dimension are given through simulations of one- and two-dimensional Bak-Sneppen models. It is suggested that this new quantity may be a good quantity in determining the emergence of criticality.Comment: 6 pages, 4 figure

    The forget-remember mechanism for 2-state spreading

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    A new mechanism, the forget-remember mechanism, is proposed for studying the spreading process in 2-state model. Such mechanism exhibits behaviors of message spreading influenced by some kinds of functions about time and history caring about the individuals of the spreading system, holding message or being out of message. To demonstrate the mechanism, both linear and exponential forms for forget-function and remember-function are simulated and show that a great impact on the saturation of message-spreading and the relative phase transformation.Comment: 4 pages, 3 figures, revtex

    Finite-Size Effects in Critical Phenomena from Mean Field Approach with Ď•4\phi^4 Model

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    The finite-size effects in critical phenomena of a thin film system are studied from a mean field (MF) approach with Ď•4\phi^4 model for second-order phase transition. The influence of boundary condition on the critical properties are emphasized. Scaling functions for relative free-energy and relative specific heat capacity are given.Comment: 10 pages, LaTeX, 4 figure in PS forma

    Hawking Radiation of a Non-stationary Kerr-Newman Black Hole: Spin-Rotation Coupling Effect

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    Hawking evaporation of Klein-Gordon and Dirac particles in a non-stationary Kerr-Newman space-time is investigated by using a method of generalized tortoise coordinate transformation. The location and the temperature of the event horizon of a non-stationary Kerr-Newman black hole are derived. It is shown that the temperature and the shape of the event horizon depend not only on the time but also on the angle. However, the Fermionic spectrum of Dirac particles displays a new spin-rotation coupling effect which is absent from that of Bosonic distribution of scalar particles. The character of this effect is its obvious dependence on different helicity states of particles spin-1/2. PACS numbers: 04.70.Dy, 97.60.LfComment: 12 pages, revtex, no figure, to appear in Gen. Rel. Grav. 34 (2002) No.

    No New Quantum Thermal Effect of Dirac Particles in a Charged Vaidya - de Sitter Black Hole

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    It is shown that Hawking radiation of Dirac particles does not exist for P1,Q2P_1, Q_2 components but for P2,Q1P_2, Q_1 components in a charged Vaidya - de Sitter black hole. Both the location and the temperature of the event horizon change with time. The thermal radiation spectrum of Dirac particles is the same as that of Klein-Gordon particles. Our result demonstrates that there is no new quantum effect in the thermal radiation of Dirac particles in any spherically symmetry black holes.Comment: 12pt revtex, 10 pages, no figure, accepted for IL Nuovo Cimento

    Generalized Laws of Black Hole Thermodynamics and Quantum Conservation Laws on Hawking Radiation Process

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    Four classical laws of black hole thermodynamics are extended from exterior (event) horizon to interior (Cauchy) horizon. Especially, the first law of classical thermodynamics for Kerr-Newman black hole (KNBH) is generalized to those in quantum form. Then five quantum conservation laws on the KNBH evaporation effect are derived in virtue of thermodynamical equilibrium conditions. As a by-product, Bekenstein-Hawking's relation S=A/4 S=A/4 is exactly recovered.Comment: Latex, 8 pages, no figur

    Four Quantum Conservation Laws on Black Hole Equilibrium Radiation Process and Quantum Black Hole Entropy

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    The classical first law of thermodynamic for Kerr-Newmann black hole (KNBH) is generalized to that in quantum form on event horizon. Then four quantum conservation laws on the KNBH equilibrium radiation process are derived, and Bekenstein-Hawking's relation S=A/4 is recovered. It can be argued that the classical entropy of black hole arise from the quantum entropy of field quanta or quasi-particles inside the hole.Comment: 10 Pages, in Latex, no figur

    Four Quantum Conservation Laws for Black Hole Stationary Equilibrium Radiation Processes

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    The classical first law of thermodynamics for a Kerr-Newman black hole (KNBH) is generalized to a law in quantum form on the event horizon. Then four quantum conservation laws on the KNBH equilibrium radiation process are derived. The Bekenstein-Hawking relation S=A/4{\cal{S}}={\cal{A}}/4 is exactly established. It can be inferred that the classical entropy of black hole arises from the quantum entropy of field quanta or quasi-particles inside the hole.Comment: 7 pages, no figure, Revtex in 12p

    A New Perturbation Theory of Finite-Size Effects Near Critical Point

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    A new perturbation theory is proposed for studying finite-size effects near critical point of the Ď•4\phi^4 model with a one-component order parameter. The new approach is based on the techniques of generating functional and functional derivative with respect to external source field and can be used for temperatures both above and below the critical point of the bulk system. It is shown that this approach is much simpler comparing with available perturbation theories. Particularly, this new method avoids renormalization in calculating many physical quantities such as correlation functions etc..Comment: 9 pages, in revte
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