Conformal inflation with chameleon coupling

Abstract

We investigate the possibility that the inflaton, in particular in conformal inflation models, is also a chameleon, i.e. that it couples to the energy density of some heavy non-relativistic matter present during inflation. We find new and interesting attractor behaviours, either prolonging inflation, or changing the observables $n_s,r$, depending on the sign of the chameleon coupling exponent. We also check that the chameleon coupling with the heavy matter field strongly suppress entropy modes during inflation.

28 pages, 11 figures; reference added; section 4 reviewed

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• Cosmological Inflation in f(Q, T) Gravity
• Conformal inflation in the metric-affine geometry
• Minimal $k$-inflation in light of the conformal metric-affine geometry
• Cosmic Acceleration and Geodesic Deviation in Chameleon Scalar Field Model
• Cosmological Solutions of Chameleon Scalar Field Model
• Quantum corrections to symmetron fifth-force profiles