Speaker
Kristjan Kannike
(Nat. Inst. of Chem.Phys. & Biophys. (EE))
Description
We present a minimal model of inflation where the Planck scale is dynamically generated from dimensionless interactions. The inflaton field $\phi$ gets a vacuum expectation value via dimensional transmutation. The Planck scale is generated via its non-minimal coupling to gravity $\xi\phi^2 R$. To generate the minimum of the inflaton potential, one needs a singlet scalar and new fermion(s) which can provide a dark matter candidate. The spectral index is predicted to be $n_s \approx 0.96$. The tensor-to-scalar ratio can vary from $r \approx 0.13$ down to $r \approx 0.04$ in presence of large couplings or $r \approx 0.003$ if the Lagrangian contains an $R^2$ term, interpolating between the quadratic and Starobinsky inflation. These theories relate the smallness of the weak scale to the smallness of inflationary perturbations: both arise naturally because of small couplings, implying a reheating temperature of $10^{7-9}$ GeV. A measurement of $r$ by Keck/Bicep3 would give us information on quantum gravity in the dimensionless scenario.
Primary author
Kristjan Kannike
(Nat. Inst. of Chem.Phys. & Biophys. (EE))
Co-authors
Alberto Salvio
(IFAE, Barcelona)
Alessandro Strumia
(Nat. Inst. of Chem.Phys. & Biophys. (EE))
Antonio Racioppi
(Nat. Inst. of Chem.Phys. & Biophys. (EE))
Dr
Gert Hütsi
(Tõravere Observatory, Estonia)
Mr
Liberato Pizza
(Pisa University)
Dr
Martti Raidal
(Nat. Inst. of Chem.Phys. & Biophys. (EE))
