Geodesic
Theory of dynamical affine and conformal symmetries as the theory of the gravitational field
Teoretičeskaâ i matematičeskaâ fizika, Tome 21 (1974) no. 3, pp. 329-342

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Invariance under the infinite-parameter generally covariant group is equivalent to simultaneous invariance under the affine and the conformal group. A nonlinear realization of the affine group (with linearization on the poincar6 group) leads to a symmetric tensor field as Goldstone field. The requirement that the theory correspond simultaneously to a realization of the conformal group as well leads uniquely to the theory of a tensor field whose equations are Einstein's. This shows that the theory of the gravitational field is the theory of spontaneous breaking of affine and conformal symmetries in the same way as chiral dynamics is the theory of spontaneous breaking of chiral symmetry. This analogy brings out new aspects of the role of gravitation in the theory of elementary particles. 
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     author = {A. B. Borisov and V. I. Ogievetskii},
     title = {Theory of dynamical affine and conformal symmetries as the theory of the gravitational field},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
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     number = {3},
     year = {1974},
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     url = {http://geodesic.mathdoc.fr/item/TMF_1974_21_3_a4/}
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A. B. Borisov; V. I. Ogievetskii. Theory of dynamical affine and conformal symmetries as the theory of the gravitational field. Teoretičeskaâ i matematičeskaâ fizika, Tome 21 (1974) no. 3, pp. 329-342. http://geodesic.mathdoc.fr/item/TMF_1974_21_3_a4/