Title
Conformal Description of Spinning Particles (Trieste Notes in Physics),Used
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These notes arose from a series of lectures first presented at the Scuola Interna zionale Superiore di Studi Avanzati and the International Centre for Theoretical Physics in Trieste in July 1980 and then, in an extended form, at the Universities of Sofia (198081) and Bielefeld (1981). Their objective has been twofold. First, to introduce theorists with some background in group representations to the notion of twistors with an emphasis on their conformal properties; a short guide to the literature on the subject is designed to compensate in part for the imcompleteness and the onesidedness of our review. Secondly, we present a systematic study of po sitive energy conformal orbits in terms of twistor flag manifolds. They are interpre ted as cl assi ca 1 phase spaces of "conformal parti cl es"; a characteri sti c property of such particles is the dilation invariance of their mass spectrum which, there fore, consists either of the point zero or of the infinite interval 222 o
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