Large-n Limit of N=2 Supersymmetric Q^n Model in Two Dimensions

We investigate non-perturbative structures of the two-dimensional N=2 supersymmetric nonlinear sigma model on the quadric surface Q^{n-2}(C) = SO(n)/SO(n-2)xU(1), which is a Hermitian symmetric space, and therefore Kahler, by using the auxiliary field and large-n methods. This model contains two kinds of non-perturbatively stable vacua; one of them is the same vacuum as that of supersymmetric CP^{n-1} model, and the other is a new kind of vacuum, which has not yet been known to exist in two-dimensional nonlinear sigma models, the Higgs phase. We show that both of these vacua are asymptotically free. Although symmetries are broken in these vacua, there appear no massless Nambu-Goldstone bosons, in agreement with Coleman's theorem, due to the existence of two different mechanisms in these vacua, the Schwinger and the Higgs mechanisms.Comment: LaTeX, 28 pages, 22 figures, published versio

Supersymmetric Nonlinear Sigma Models on Ricci-flat Kahler Manifolds with O(N) Symmetry

We propose a class of N=2 supersymmetric nonlinear sigma models on the Ricci-flat Kahler manifolds with O(n) symmetry.Comment: LaTeX2e, 7 pages, no figures, typos corrected, references adde

Gauge Theoretical Construction of Non-compact Calabi-Yau Manifolds

We construct the non-compact Calabi-Yau manifolds interpreted as the complex line bundles over the Hermitian symmetric spaces. These manifolds are the various generalizations of the complex line bundle over CP^{N-1}. Imposing an F-term constraint on the line bundle over CP^{N-1}, we obtain the line bundle over the complex quadric surface Q^{N-2}. On the other hand, when we promote the U(1) gauge symmetry in CP^{N-1} to the non-abelian gauge group U(M), the line bundle over the Grassmann manifold is obtained. We construct the non-compact Calabi-Yau manifolds with isometries of exceptional groups, which we have not discussed in the previous papers. Each of these manifolds contains the resolution parameter which controls the size of the base manifold, and the conical singularity appears when the parameter vanishes.Comment: LaTeX2e, 27 pages, no figures, typos correcte

A Note on Conifolds

We present the Ricci-flat metric and its Kahler potential on the conifold with the O(N) isometry, whose conical singularity is repaired by the complex quadric surface Q^{N-2} = SO(N)/SO(N-2)xU(1).Comment: LaTeX2e, 8 pages, no figures, accepted for publication in Physics Letters

Special Issue on Financial Systems: UDC 681.172.2-52: 681.322 Software for AT-400N Automated Teller Machine

We developed the AT-400N automated teller machine by reconstructing embedded ATM software, which was formerly developed with a dedicated OS / dedicated language, with a general purpose OS / general purpose language. This machine has WOSA/XFS, which can insure the portability of Oki software to ATM platforms made by other manufacturers. To improve productivity and maintainability, an object oriented development method was used for the middle software layer, where ATM core processing is executed. 1

Structural and electrochemical properties of hard carbon negative electrodes for sodium secondary batteries using the Na[FSA]–[C₃C₁pyrr][FSA] ionic liquid electrolyte

Two kinds of hard carbon (HC) were investigated as negative electrodes for sodium secondary batteries using Na[FSA]–[C₃C₁pyrr][FSA] as an ionic liquid electrolyte at 363 K. The structural properties of HCs were studied by X-ray diffraction (XRD), Raman spectroscopy, small-angle X-ray scattering (SAXS), and field-emission scanning electron microscopy (FE-SEM). The interlayer distance between graphene sheets and the pore size were different for these HCs. Potential slope and plateau regions were observed in charge–discharge curves, which is typical for HC negative electrodes. More detailed examinations revealed that the HC with a larger interlayer distance showed higher capacity in the slope region, while that with a larger pore size exhibited a higher capacity in the plateau region. Finally, the rate capabilities and cycling properties of HC negative electrodes were evalua