Gauge Theory of Dual Resonance Models and Spontaneous Breaking
Questionable as some of the phenomenological consequences of dual resonance models (DRM) might be, this theory is on the whole a very successfull one and most of all a rigorous one. One of the most important properties of the acceptable DRMs is their conformai invariance, a consequence of a ghost-free spectrum. This invariance, on the other hand, is as stringent as a gauge invariance and requires likewise massless particles which physically should have a mass. One therefore has to devise means to break this symmetry spontaneously without spoiling the formal symmetry.
KeywordsGauge Theory Conformal Transformation Conformal Invariance Massless Particle Spontaneous Symmetry Breaking
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