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Abstract
We examine a scalar-tensor model of gravity that is globally scale-invariant. When adapted to a spatially flat Robertson-Walker metric, the equations of motion describe a dynamical system that flows from an unstable de Sitter space to a stable one. We show that during this transition inflation can occur. Moreover, at the final fixed point, a mass scale naturally emerges that can be identified with the Planck mass. We compute the inflationary spectral indices and the tensor perturbation and we compare them with observations. We also study the possibility that primordial magnetic fields are generated during inflation.
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1 Dipartimento di Fisica, Università di Trento , Via Sommarive 14, I-38123 Povo (TN) , Italy; TIFPA-INFN, Via Sommarive 14 , I-38123 Povo (TN) , Italy
2 Institute of Theoretical Physics, Faculty of Physics, University of Warsaw , ul. Pasteura 5, 02-093 Warsaw , Poland
3 Department of Physics, Indian Institute of Technology Kanpur Kalyanpur , Kanpur 208016 , India