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Roman Pasechnik

Senior lecturer

Typical working day..

Dark Energy from graviton-mediated interactions in the QCD vacuum

Author

  • Roman Pasechnik
  • Vitaly Beylin
  • Grigory Vereshkov

Summary, in English

Adopting the hypothesis about the exact cancellation of vacuum condensates contributions to the ground state energy in particle physics to the leading order in graviton-mediated interactions, we argue that the observable cosmological constant can be dynamically induced by an uncompensated quantum gravity correction to them after the QCD phase transition epoch. To start with, we demonstrate a possible cancellation of the quark-gluon condensate contribution to the total vacuum energy density of the Universe at temperatures T < 100 MeV without taking into account the graviton-mediated effects. In order to incorporate the latter, we then calculate the leading-order quantum correction to the classical Einstein equations due to metric fluctuations induced by the non-perturbative vacuum fluctuations of the gluon and quark fields in the quasiclassical approximation. It has been demonstrated that such a correction to the vacuum energy density has a form epsilon(Lambda) similar to G Lambda(6)(QCD), where G is the gravitational constant, and Lambda(QCD) is the QCD scale parameter. We analyze capabilities of this approach based on the synthesis between quantum gravity in quasiclassical approximation and theory of non-perturbative QCD vacuum for quantitative explanation of the observed Dark Energy density.

Department/s

  • Theoretical Particle Physics

Publishing year

2013

Language

English

Publication/Series

Journal of Cosmology and Astroparticle Physics

Issue

6

Document type

Journal article

Publisher

IOP Publishing

Topic

  • Subatomic Physics

Keywords

  • dark energy theory
  • quantum field theory on curved space
  • quantum
  • gravity phenomenology
  • particle physics - cosmology connection

Status

Published

ISBN/ISSN/Other

  • ISSN: 1475-7516