
Roman Pasechnik, Vitaly Beylin, Grigory Vereshkov
Dark Energy from gravitonmediated interactions in the QCD vacuum
Abstract
Adopting the hypothesis about the exact cancellation of vacuum condensates contributions to the ground state energy in particle physics to the leading order in gravitonmediated interactions, we argue that the observable cosmological constant can be dynamically induced by an uncompensated quantum gravity correction to them. To start with, we demonstrate a possible cancellation of the quarkgluon condensate contribution to the total vacuum energy density of the Universe without taking into account the gravitonmediated effects. In order to incorporate the latter, we then calculate the leadingorder quantum correction to the classical Einstein equations due to metric fluctuations induced by the nonperturbative 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 ~ G Lambda_QCD^6, 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 nonperturbative QCD vacuum for quantitative explanation of the observed Dark Energy density.
LU TP 1307
