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

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F47813059%3A19630%2F20%3AA0000079" target="_blank" >RIV/47813059:19630/20:A0000079 - isvavai.cz</a>

Výsledek na webu

<a href="https://www.mdpi.com/2073-8994/12/4/531" target="_blank" >https://www.mdpi.com/2073-8994/12/4/531</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.3390/sym12040531" target="_blank" >10.3390/sym12040531</a>

Jazyk výsledku

angličtina

Název v původním jazyce

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

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

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

Popis výsledku anglicky

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.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10300 - Physical sciences

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2020

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Symmetry

ISSN

2073-8994

e-ISSN

—

Svazek periodika

12

Číslo periodika v rámci svazku

4

Stát vydavatele periodika

CH - Švýcarská konfederace

Počet stran výsledku

17

Strana od-do

„531-1“-„531-17“

Kód UT WoS článku

000540222200042

EID výsledku v databázi Scopus

2-s2.0-85084614976