Gaku Konisi

Left-Right Symmetric Model from Geometric Formulation of Gauge Theory in M4 × Z2 × Z2

The left-right symmetric model (LRSM) with gauge group

Supergauge Algebra and Interaction between Open and Closed Strings

SU(2)_{L} \times SU(2)_{R} \times U(1)_{B-L}

Collective Excitations in Local-Gauge Invariant Superconductivity Models

is reconstructed from the geometric formulation of gauge theory in

Generalized Conformal Gauge Conditions in Dual Models

M_4 \times Z_2 \times Z_2

Analyticity in Coupling Constant, Angular Momentum and Energy of the S-Matrix for Potential Scattering

where

Brans-Dicke Theory from M4 ×Z2 Geometry

M_4

The q-number Schwinger Term and the Breakdown of the Associative Law for Current Operators

is the four-dimensional Minkowski space and

Maximum Analyticity in Angular Momentum and Energy of the Bethe-Salpeter Scattering Amplitudes

Z_2 \times Z_2

Closed superstrings in a uniform magnetic field and regularization criterion

the discrete space with four points. The geometrical structure of this model becomes clearer compared with other works based on noncommutative geometry. As a result, the Yukawa coupling terms and the Higgs potential are derived in more restricted forms than in the standard LRSM.

Interaction between Noncommutative Open Strings and Closed-String Tachyons

In the Neveu-Schwarz and Ramond models we construct the vertices which describe the emission of closed-string ground-state particles out of open string states. The modified supergauge algebra associated with the new vertices can be shown to hold in the same form as the usual supergauge algebra in free cases. and is crucial for proving the no-ghost theorem in our system.