J 2020

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

CREMASCHINI, Claudio and Massimo TESSAROTTO

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

Language

English

Type of outcome

Článek v odborném periodiku

Field of Study

10300 1.3 Physical sciences

Country of publisher

Switzerland

Confidentiality degree

není předmětem státního či obchodního tajemství

References:

RIV identification code

RIV/47813059:19630/20:A0000079

Organization unit

Institute of physics in Opava

UT WoS

000540222200042

Keywords in English

covariant quantum gravity; cosmological constant; DeSitter space-time; massive gravitons

Tags

Tags

International impact, Reviewed
Změněno: 23/3/2021 21:59, Mgr. Pavlína Jalůvková

Abstract

V originále

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.