Journal
JOURNAL OF HIGH ENERGY PHYSICS
Volume -, Issue 5, Pages -Publisher
SPRINGER
DOI: 10.1007/JHEP05(2015)065
Keywords
Cosmology of Theories beyond the SM; Renormalization Group
Categories
Funding
- CERN+
- EU through the ERDF CoE program
- Spanish Ministry of Economy and Competitiveness [FPA2012-32828]
- Consolider-CPAN [CSD2007-00042]
- Centro de Excelencia Severo Ochoa Programme [SEV-2012-0249]
- C.A. de Madrid [HEPHACOS-S2009/ESP1473]
- [PUT799]
- [MTT8]
- [MTT60]
- [IUT23-6]
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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 n(s) approximate to 0.96 for the spectral index and r approximate to 0.13 for the tensor-toscalar ratio, which can be reduced down to approximate 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 n(s) approximate to 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 10(7-9) GeV. A measurement of r by Keck/Bicep3 would give us information on quantum gravity in the dimensionless scenario.
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