Dynamically induced Planck scale and inflation
By K. Kannike, Gert Hütsi, L. Pizza, A. Racioppi, M. Raidal, A. Salvio, Alessandro Strumia. Journal of High Energy Physics, 2015
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Theories where the Planck scale is dynamically generated from dimensionless interactions provide predictive inflationary potentials and super-Planckian field variations. We first study the minimal single field realisation in the low-energy effective field theory limit, finding the predictions ns ≈ 0.96 for the spectral index and r ≈ 0.13 for the tensor-to-scalar ratio, which can be reduced down to ≈ 0.04 in presence of large couplings. Next we consider agravity as a dimensionless quantum gravity theory finding a multifield inflation that converges towards an attractor trajectory and predicts ns ≈ 0.96 and 0.003 < r < 0.13, 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 107−9 GeV. A measurement of r by Keck/Bicep3 would give us information on quantum gravity in the dimensionless scenario.
Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics, Statistical and Nonlinear Physics
View Paper: https://www.semanticscholar.org/paper/763edb4f7b5ce7641111820bc5fec8cfcd544d2f
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Citations in the corpus
- Quadratic Gravity (2018, background): “However, when it comes to cosmological applications it is often better to express the gravitational part of the theory in a form closer to Einstein gravity [20, 21].”
- Dark matter and neutrino masses from a scale-invariant multi-Higgs portal (2015, background): “Taking the renormalization scale μ at the UV, we can in principle account for an exponential hierarchy between the electroweak scale 〈H〉 and the Planck scale μ = MP [15–18], provided the particle content of the theory is such that the radiative corrections coefficient C is positive.”