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Article

Quantum-Gravity Screening Effect of the Cosmological Constant in the DeSitter Space–Time

1
Research Center for Theoretical Physics and Astrophysics, Institute of Physics, Silesian University in Opava, Bezručovo nám.13, CZ-74601 Opava, Czech Republic
2
Department of Mathematics and Geosciences, University of Trieste, Via Valerio 12, 34127 Trieste, Italy
*
Author to whom correspondence should be addressed.
Symmetry 2020, 12(4), 531; https://doi.org/10.3390/sym12040531
Received: 9 January 2020 / Revised: 13 March 2020 / Accepted: 24 March 2020 / Published: 3 April 2020
Small-amplitude quantum-gravity periodic perturbations of the metric tensor, occurring in sequences of phase-shifted oscillations, are investigated for vacuum conditions and in the context of the manifestly-covariant theory of quantum gravity. The theoretical background is provided by the Hamiltonian representation of the quantum hydrodynamic equations yielding, in turn, quantum modifications of the Einstein field equations. It is shown that in the case of the DeSitter space–time sequences of small-size periodic perturbations with prescribed frequency are actually permitted, each one with its characteristic initial phase. The same perturbations give rise to non-linear modifications of the Einstein field equations in terms of a suitable stochastic-averaged and divergence-free quantum stress-energy tensor. As a result, a quantum-driven screening effect arises which is shown to affect the magnitude of the cosmological constant. Observable features on the DeSitter space–time solution and on the graviton mass estimate are pointed out. View Full-Text
Keywords: covariant quantum gravity; cosmological constant; DeSitter space–time; massive gravitons covariant quantum gravity; cosmological constant; DeSitter space–time; massive gravitons
MDPI and ACS Style

Cremaschini, C.; Tessarotto, M. Quantum-Gravity Screening Effect of the Cosmological Constant in the DeSitter Space–Time. Symmetry 2020, 12, 531. https://doi.org/10.3390/sym12040531

AMA Style

Cremaschini C, Tessarotto M. Quantum-Gravity Screening Effect of the Cosmological Constant in the DeSitter Space–Time. Symmetry. 2020; 12(4):531. https://doi.org/10.3390/sym12040531

Chicago/Turabian Style

Cremaschini, Claudio, and Massimo Tessarotto. 2020. "Quantum-Gravity Screening Effect of the Cosmological Constant in the DeSitter Space–Time" Symmetry 12, no. 4: 531. https://doi.org/10.3390/sym12040531

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