335 research outputs found

    Topological and Curvature Effects in a Multi-fermion Interaction Model

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    A multi-fermion interaction model is investigated in a compact spacetime with non-trivial topology and in a weakly curved spacetime. Evaluating the effective potential in the leading order of the 1/N expansion, we show the phase boundary for a discrete chiral symmetry in an arbitrary dimensions, 2≤D<42\leq D<4.Comment: 7 pages, 6 figures, Contribution to the proceedings of 2009 Nagoya Global COE Workshop "Strong Coupling Gauge Theories in LHC Era (SCGT09)

    A Study of Adverbs Presented in Textbooks for Japanese Learners

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    Curvature and topological effects on dynamical symmetry breaking in a four- and eight-fermion interaction model

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    A dynamical mechanism for symmetry breaking is investigated under the circumstances with the finite curvature, finite size and non-trivial topology. A four- and eight-fermion interaction model is considered as a prototype model which induces symmetry breaking at GUT era. Evaluating the effective potential in the leading order of the 1/N-expansion by using the dimensional regularization, we explicitly calculate the phase boundary which divides the symmetric and the broken phase in a weakly curved space-time and a flat space-time with non-trivial topology, RD−1⊗S1R^{D-1} \otimes S^1.Comment: 20 pages, 21 figure

    Mori Ogai : Arzt und Dichter -- die bedeutung seines Deutschlandaufenthalts --

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    Phase Structure of a Four- and Eight-Fermion Interaction Model at Finite Temperature and Chemical Potential in Arbitrary Dimensions

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    The phase structure of a four- and eight-fermion interaction model is investigated at finite temperature and chemical potential in arbitrary space-time dimensions, 2≤D<42\leq D<4. The effective potential and the gap equation are calculated in the leading order of the 1/N expansion. If the first order phase transition takes place, the phase boundary dividing the symmetric and the broken phase is modified by the eight-fermion interaction.Comment: 20 pages, 26 figures; revised argument and added reference for section

    Urban Transport Sustainability

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    The paper describes the possible direction of Asian EST, starting with an overview of recent&nbsp;trends and problems in transport systems within Asia, policy practices are also introduced. It&nbsp;was found that although the current situation and trend of transport in the Asian region&nbsp;presents a diverse picture stemming from geographical differences and levels of economic&nbsp;development, most Asian countries share similar concerns about transport-related problems,&nbsp;namely severe congestion, air and noise pollution,. Common patterns can be identified&nbsp;behind these problems, which include: a)large increases in traffic demand, resulting from&nbsp;rapid economic growth, urbanization, and motorisation, b)poor control of vehicle emissions&nbsp;and the absence of effective inspection and maintenance systems, c)lack of adequate and&nbsp;appropriate infrastructures, and d)poor coordination of transport and land-use policies. In&nbsp;the current situation, insufficient understanding of environmental deterioration mechanisms&nbsp;delay the implementation of necessary policy measures in many Asian countries. Each country should find the best way to achieve EST as fast as possible by learning from others’&nbsp;experiences. Existing good examples within the region, such as intermediate public transport&nbsp;systems and electric road pricing, can provide a strong foundation for this purpose
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