Non-Commutative Differential Geometry on Discrete Space $M_4\times Z\ma{N}$ and Gauge Theory

Details Non-Commutative Differential Geometry on Discrete Space $M_4\times Z\ma{N}$ and Gauge Theory Non-Commutative Differential Geometry on Discrete Space $M_4\times Z\ma{N}$ and Gauge Theory

1996-06-19

arxiv.org/abs/hep-th/9606114v1

Prog.Theor.Phys. 96 (1996) 1021-1036

Physics

High Energy Physics

High Energy Physics - Theory

12 pages, PTPTEX.sty

Scientific paper

10.1143/PTP.96.1021

The algebra of non-commutative differential geometry (NCG) on the discrete space $M_4\times Z\ma{N}$ previously proposed by the present author is improved to give the consistent explanation of the generalized gauge field as the generalized connection on $M_4\times Z\ma{N}$. The nilpotency of the generalized exterior derivative ${\mbf d}$ is easily proved. The matrix formulation where the generalized gauge field is denoted in matrix form is shown to have the same content with the ordinary formulation using {\mbf d}, which helps us understand the implications of the algebraic rules of NCG on $M_4\times Z\ma{N}$. The Lagrangian of spontaneously broken gauge theory which has the extra restriction on the coupling constant of the Higgs potential is obtained by taking the inner product of the generalized field strength. The covariant derivative operating on the fermion field determines the parallel transformation on $M_4\times Z\ma{N}$, which confirms that the Higgs field is the connection on the discrete space. This implies that the Higgs particle is a gauge particle on the same footing as the weak bosons. Thus, it is expected that the mass relation $m\ma{H}=\frac{4}{\sqrt{3}}m\ma{W}\sin\theta\ma{W}$ proposed by the present author holds without any correction in the same way as the mass relation $m\ma{W}=m\ma{Z}\cos\theta\ma{W}$. The Higgs kinetic and potential terms are regarded as the curvatures on $M_4\times Z\ma{N}$.

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