Renormalization-group running induced cosmic inflation

Year: 2020

Authors: Māriān IG., Defenu N., Jentschura U.D., Trombettoni A., Nāndori I.

Autors Affiliation: Univ Debrecen, POB 105, H-4010 Debrecen, Hungary; Heidelberg Univ, Inst Theoret Phys, D-69120 Heidelberg, Germany; Missouri Univ Sci & Technol, Dept Phys, Rolla, MO 65409 USA; MTA DE Particle Phys Res Grp, POB 51, H-4001 Debrecen, Hungary; MTA Atomki, POB 51, H-4001 Debrecen, Hungary; CNR IOM DEMOCRITOS Simulat Ctr, Via Bonomea 265, I-134136 Trieste, Italy; SISSA, Via Bonomea 265, I-134136 Trieste, Italy; INFN, Sez Trieste, Via Bonomea 265, I-134136 Trieste, Italy.

Abstract: As a contribution to a viable candidate for a standard model of cosmology, we here show that pre-inflationary quantum fluctuations can provide a scenario for the long-sought initial conditions for the inflaton field. Our proposal is based on the assumption that at very high energies (higher than the energy scale of inflation) the vacuum-expectation value (VeV) of the field is trapped in a false vacuum and then, due to renormalization-group (RG) running, the potential starts to flatten out toward low energy, eventually tending to a convex one which allows the field to roll down to the true vacuum. We argue that the proposed mechanism should apply to large classes of inflationary potentials with multiple concave regions. Our findings favor a particle physics origin of chaotic, large-field inflationary models as we eliminate the need for large field fluctuations at the GUT scale. In our analysis, we provide a specific example of such an inflationary potential, whose parameters can be tuned to reproduce the existing cosmological data with good accuracy.

Journal/Review: JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS

Volume: (6)      Pages from: 28-1  to: 28-33

More Information: This work was supported by UNKP-17-3 New National Excellence Program of the Ministry of Hu man Capacities, the National Science Foundation (Grant PHY-1710856) and the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) via Collaborative Research Centre SFB1225(ISOQUANT) and under Germany’s Excellence Strategy EXC-2181/1390900948 (the Heidelberg STRUCTURES Excellence Cluster). Useful discussions with Z. Trocsanyi and G. Somogyi are gratefully acknowledged. N. D. is grateful to F. Bianchini and J. Rubio for useful discussion in the early stages of this work. The CNR/MTA ItalyHungary 2019-2021 Joint Project Strongly interacting systems in confined geometries also is gratefully acknowledged.
KeyWords: particle physics – cosmology connection; initial conditions and eternal universe; non-gaussianity; cosmological parameters from CMBR
DOI: 10.1088/1475-7516/2020/06/028

Citations: 3
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