The physical equivalence of Einstein and Jordan frames in scalar-tensor theories was explained by Dicke in 1962: they are related by a local transformation of units. We discuss this point in a cosmological framework. Our main result is the construction of a formalism in which all the physical observables are frame-invariant. The application of this approach to CMB codes is at present under analysis. © 2007 IOP Publishing Ltd.
Local transformations of units in scalar-tensor cosmology / Catena, R.; Pietroni, M.; Scarabello, L.. - In: JOURNAL OF PHYSICS. A, MATHEMATICAL AND THEORETICAL. - ISSN 1751-8113. - 40:25(2007), pp. 6883-6887. [10.1088/1751-8113/40/25/S34]
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