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Starobinsky-Like Inflation and Running Vacuum in the Context of Supergravity

1
Academy of Athens, Research Center for Astronomy and Applied Mathematics, Soranou Efessiou 4, 115 27 Athens, Greece
2
Theoretical Particle Physics and Cosmology Group, Physics Department, King’s College London, Strand, London WC2R 2LS, UK
3
Theoretical Physics Department, CERN, Geneva CH-1211 Geneva 23, Switzerland
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Departament de Física Quàntica i Astrofísica, and Institute of Cosmos Sciences (ICCUB), Univ. de Barcelona, Av. Diagonal 647 E-08028 Barcelona, Catalonia, Spain
*
Author to whom correspondence should be addressed.
Academic Editor: Lorenzo Iorio
Universe 2016, 2(3), 14; https://doi.org/10.3390/universe2030014
Received: 11 May 2016 / Revised: 17 July 2016 / Accepted: 18 July 2016 / Published: 26 July 2016
We describe the primeval inflationary phase of the early Universe within a quantum field theoretical (QFT) framework that can be viewed as the effective action of vacuum decay in the early times. Interestingly enough, the model accounts for the “graceful exit” of the inflationary phase into the standard radiation regime. The underlying QFT framework considered here is supergravity (SUGRA), more specifically an existing formulation in which the Starobinsky-type inflation (de Sitter background) emerges from the quantum corrections to the effective action after integrating out the gravitino fields in their (dynamically induced) massive phase. We also demonstrate that the structure of the effective action in this model is consistent with the generic idea of re-normalization group (RG) running of the cosmological parameters; specifically, it follows from the corresponding RG equation for the vacuum energy density as a function of the Hubble rate, ρ Λ ( H ) . Overall, our combined approach amounts to a concrete-model realization of inflation triggered by vacuum decay in a fundamental physics context, which, as it turns out, can also be extended for the remaining epochs of the cosmological evolution until the current dark energy era. View Full-Text
Keywords: cosmology; inflation; vacuum cosmology; inflation; vacuum
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Basilakos, S.; Mavromatos, N.E.; Solà, J. Starobinsky-Like Inflation and Running Vacuum in the Context of Supergravity. Universe 2016, 2, 14.

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