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 spacetime transformations.
 Publication:

Annalen der Physik
 Pub Date:
 September 2008
 DOI:
 10.1002/andp.200810324
 arXiv:
 arXiv:0808.2730
 Bibcode:
 2008AnP...520..631K
 Keywords:

 Physics  History of Physics;
 General Relativity and Quantum Cosmology;
 High Energy Physics  Theory;
 Mathematical Physics
 EPrint:
 82 pages, 3 figures