142,709 research outputs found

    Scalar and vector meson propagation in asymmetric nuclear matter

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    The propagation of the scalar (\sigma and \delta) and vector (\omega and \rho) mesons in an iso-asymmetric nuclear matter is studied in detail, using the Walecka model. We calculate the invariant masses and spectral functions of the mesons, including the effect of meson mixing. At finite density, the mixing effect is quite important in the propagation of the scalar and (longitudinal) vector mesons. In the \sigma channel, we find a three-peak structure in the spectral function, caused by the mixing effect.Comment: 10 pages, 2 figures. Fig.2 is given separately. High resolution images are available on reques

    On the Solution of Topological Landau-Ginzburg Models with c=3c=3

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    The solution is given for the c=3c=3 topological matter model whose underlying conformal theory has Landau-Ginzburg model W=-\qa (x^4 +y^4)+\af x^2y^2. While consistency conditions are used to solve it, this model is probably at the limit of such techniques. By using the flatness of the metric of the space of coupling constants I rederive the differential equation that relates the parameter \af\ to the flat coordinate tt. This simpler method is also applied to the x3+y6x^3+y^6-model.Comment: 7p

    Naturalness in the quark-meson coupling model

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    The quark-meson coupling (QMC) model is examined using Georgi's ``naive dimensional analysis''. We argue that the QMC model is quite natural as an effective field theory for nuclei.Comment: 11pages, no fig., submitted to Phys. Lett.

    Flavour asymmetry of anti-quarks in nuclei

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    A novel nuclear effect on the flavour asymmetry of anti-quarks in the nucleon bound in a nucleus is discussed in terms of the meson cloud model and the Pauli exclusion principle. It is expected that the flavour asymmetry is enhanced in a nucleus.Comment: 3 pages, Euro. Phys. J. A in pres

    Is english our lingua franca or the native speaker's property? The native speaker orientation among middle school students in Japan

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    This paper reports the first empirical study to date that sought to examine the native speaker orientation among middle school EFL students in Japan. To this end, this preliminary study measured their language attitudes in this respect addressing age-stratified and gender variations. The data was elicited from an attitude survey with 318 eighth and ninth graders at a public middle school. The findings suggest that the students gave the highest evaluations to native than to nonnative varieties of English. Second, they opted for learning English for its currency and utility in the English as a native language setting, rather than for its transnational function as a lingua franca. Lastly, the finding indicated a possible developmental trajectory of their native speaker orientation
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