CREMASCHINI, Claudio and Massimo TESSAROTTO. Quantum-Gravity Screening Effect of the Cosmological Constant in the DeSitter Space-Time. Symmetry. 2020, vol. 12, No 4, p. "531-1"-"531-17", 17 pp. ISSN 2073-8994. Available from: https://dx.doi.org/10.3390/sym12040531.
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Basic information
Original name Quantum-Gravity Screening Effect of the Cosmological Constant in the DeSitter Space-Time
Authors CREMASCHINI, Claudio (380 Italy, belonging to the institution) and Massimo TESSAROTTO (380 Italy, belonging to the institution).
Edition Symmetry, 2020, 2073-8994.
Other information
Original language English
Type of outcome Article in a journal
Field of Study 10300 1.3 Physical sciences
Country of publisher Switzerland
Confidentiality degree is not subject to a state or trade secret
WWW URL
RIV identification code RIV/47813059:19630/20:A0000079
Organization unit Institute of physics in Opava
Doi http://dx.doi.org/10.3390/sym12040531
UT WoS 000540222200042
Keywords in English covariant quantum gravity; cosmological constant; DeSitter space-time; massive gravitons
Tags FÚ, FÚ2020, RIV21
Tags International impact, Reviewed
Changed by Changed by: Mgr. Pavlína Jalůvková, učo 25213. Changed: 23/3/2021 21:59.
Abstract
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.
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