On the Advancements of Conformal Transformations and their Associated Symmetries in Geometry and Theoretical Physics

Abstract

The historical developments of conformal transformations and symmetries are sketched: Their origin from stereographic projections of the globe, their blossoming in two dimensions within the field of analytic complex functions, the generic role of transformations by reciprocal radii in dimensions higher than two and their linearization in terms of polyspherical coordinates by Darboux, Weyl's attempt to extend General Relativity, the slow rise of finite dimensional conformal transformations in classical field theories and the problem of their interpretation, then since about 1970 the rapid spread of their acceptance for asymptotic and structural problems in quantum field theories and beyond, up to the current AdS/CFT conjecture. The occasion for the present article: hundred years ago Bateman and Cunningham discovered the form invariance of Maxwell's equations for electromagnetism with respect to conformal space-time transformations.

82 pages, 3 figures; invited contribution to the special issue (Sept./Oct. 2008) commemorating Hermann Minkowski's lecture on "Raum und Zeit", Sept. 1908, Cologne

References in corpus (5)

• Unparticle Physics
• Another Odd Thing About Unparticle Physics
• Comments on Unparticles
• Effective Action, Conformal Anomaly and the Issue of Quadratic Divergences
• Structural and Dynamical Aspects of the AdS/CFT Correspondence: a Rigorous Approach

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