I.G. Koh

Galactic halos as boson stars

We investigate the boson star with the self-interacting scalar field as a model of galactic halos. The model has slightly increasing rotation curves and allows wider ranges of the mass(

Inflation and inverse symmetry breaking.

m

Supersymmetrization of the six-dimensional anomaly-free E6 × E7 × U(1) theory with Lorentz Chern-Simons term

) and coupling(

Square root singularity in boundary reflection matrix

\lambda

Dynamics of the coset conformal field theory. The BPZ equation from the KZ equation in the GKO construction

) of the halo dark matter particle than the non-interacting model previously suggested(ref.\cite{sin1}). Two quantities are related by

Fermion scattering at a phase wave

\lambda^{\frac{1}{2}} (m_p/m)^2\st{>}{\sim} 10^{50}

Supersymmetrization of N=1 ten-dimensional supergravity with Lorentz Chern-Simons term.

.

N = 4 remaining supersymmetry in a Kaluza-Klein monopole background in D = 11 supergravity theory

An inflation model with inverse symmetry breaking of two scalar fields is proposed. Constraints on the parameters for successful inflation are obtained. In general the inequality {lambda}{sub 1}{lt}{ital g}{lt}{lambda}{sub 2} should be satisfied, where {lambda}{sub 1,2} and {ital g} are the coupling constants for self-interaction and mutual interaction of two scalar fields, respectively. An example with an SU(5) GUT phase transition and numerical study is presented. This model introduces a new mechanism for the onset of inflation. {copyright} {ital 1996 The American Physical Society.}

Becchi-Rouet-Stora structure and gauge-invariant actions for higher-spin fields

Abstract The six-dimensional gravitational and gauge anomaly-free E6 × E7 × U(1) theory requires change of the three-form field strength H by an additional Lorentz Chern-Simons three-form. The action with this modification by Randjbar-Daemi, Salam, Sezgin and Strathdee is supersymmetrized to linear order in the Noether expansion parameter γ without H. The equations of motion to this order are satisfied by monopole compactifications.

Gauged seven-dimensional N = 2 pure supergravity with two-form potential and its compactifications

Abstract Two-particle scattering amplitudes for integrable relativistic quantum field theory in 1+1 dimensions can normally have at most singularities of poles and zeros along the imaginary axis in the complex rapidity plane. It has been supposed that single-particle amplitudes of the exact boundary reflection matrix exhibit the same structure. In this paper, single-particle amplitudes of the exact boundary reflection matrix corresponding to the Neumann boundary condition for affine Toda field theory associated with twisted affine algebras a 2 n (2) are conjectured, based on one-loop result, as having a new kind of square root singularity.