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@article{49405,
author = {Cremaschini, Claudio and Tessarotto, Massimo},
article_number = {4},
doi = {http://dx.doi.org/10.3390/sym12040531},
keywords = {covariant quantum gravity; cosmological constant; DeSitter space-time; massive gravitons},
language = {eng},
issn = {2073-8994},
journal = {Symmetry},
title = {Quantum-Gravity Screening Effect of the Cosmological Constant in the DeSitter Space-Time},
url = {https://www.mdpi.com/2073-8994/12/4/531},
volume = {12},
year = {2020}
}
TY - JOUR
ID - 49405
AU - Cremaschini, Claudio - Tessarotto, Massimo
PY - 2020
TI - Quantum-Gravity Screening Effect of the Cosmological Constant in the DeSitter Space-Time
JF - Symmetry
VL - 12
IS - 4
SP - "531-1"-"531-17"
EP - "531-1"-"531-17"
SN - 20738994
KW - covariant quantum gravity
KW - cosmological constant
KW - DeSitter space-time
KW - massive gravitons
UR - https://www.mdpi.com/2073-8994/12/4/531
N2 - 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.
ER -
CREMASCHINI, Claudio a Massimo TESSAROTTO. Quantum-Gravity Screening Effect of the Cosmological Constant in the DeSitter Space-Time. \textit{Symmetry}. 2020, roč.~12, č.~4, s.~''531-1''-''531-17'', 17 s. ISSN~2073-8994. Dostupné z: https://dx.doi.org/10.3390/sym12040531.
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