We review the implications of the spontaneous chiral symmetry breaking in QCD for processes involving one, two or more nucleons. Commissioned article for Int. J. Mod. Phys. E CRN 95/3 TK 95 1 February 1995

We study the spontaneous Lorentz symmetry breaking in a field theoretical model in (2+1)-dimension, inspired by string theory. This model is a gauge theory of an anti-symmetric tensor field and a vector field (photon). The Nambu-Goldstone (NG) boson for the spontaneous Lorentz symmetry breaking is identified with the unphysical massless photon in the covariant quantization. We also discuss an a...

The personal and scientific history of the discovery of spontaneous symmetry breaking in gauge theories is outlined and its scientific content is reviewed. 1 Talks presented at the Award Ceremony of the 1997 High Energy and Particle Physics Prize of the European Physical Society (Jerusalem, 24 August 1997) 2 E-mail: [email protected] 3 E-mail: [email protected]

We investigate the maximal approximate flavor symmetry in the framework of generic minimal supersymmetric standard model. We consider the low energy effective theory of the flavor physics with all the possible operators included. Spontaneous flavor symmetry breaking leads to the approximate flavor symmetry in Yukawa sector and the supersymmetry breaking sector. Fermion mass and mixing hierachie...