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We find the conditions under which scale-invariant Einstein-Cartan gravitywith scalar matter fields leads to an approximate conformal invariance of theflat space particle theory up to energies of the order of the Planck mass. Inthe minimal setup, these models, in addition to the fields of the StandardModel and the graviton, contain only one extra particle -- a massless dilaton.Theories of this type can pave the way for a self-completion all the way up thePlanck scale and lead to rather universal inflationary predictions, close tothose of the simplest Higgs-inflation scenario in the metric theory of gravity.

Scale invariant Einstein-Cartan gravity and flat space conformal symmetry