Abstract
An analog of Quantum Chromo Dynamics (QCD) sector known as mirror QCD (mQCD) can affect the cosmological evolution due to a non-trivial contribution to the Cosmological Constant analogous to that induced by the ground state in non-perturbative QCD. In this work, we explore a plausible hypothesis for trace anomalies cancellation between the usual QCD and mQCD. Such an anomaly cancellation between the two gauge theories, if it exists in Nature, would lead to a suppression or even elimination of their contributions to the Cosmological Constant. The trace anomaly compensation condition and the form of the non-perturbative mQCD coupling constant in the infrared limit have been proposed by analysing a partial non-perturbative solution of the Einstein–Yang-Mills equations of motion.
Highlights
The ground state of Yang-Mills (YM) theories plays a critical role in both Particle Physics and Cosmology
The gluon condensate in Quantum Chromo Dynamics (QCD) largely determines non-trivial properties of the topological QCD vacuum and is responsible, e.g., for the color confinement effects and hadron mass generation which can be understood beyond the Perturbation
We argue that mirror QCD sector, if exists, should affect the cosmological expansion, in particular, via an extra non-trivial “mirror gluon” contribution into the ground state energy of the universe
Summary
The ground state of Yang-Mills (YM) theories plays a critical role in both Particle Physics and Cosmology. QCD with color SU (3) gauge symmetry, there is a rather unique (negative-valued) contribution to the ground state energy of the universe originating from the non-perturbative quantum fluctuations of the quark and gluon fields [1,2,30,31], eQCD < 0. We argue that mirror QCD (mQCD) sector, if exists, should affect the cosmological expansion, in particular, via an extra non-trivial “mirror gluon” contribution into the ground state energy of the universe. We will demonstrate that under certain conditions the mirror gluon condensate can contribute to the energy density of the universe with positive sign and may, in principle, eliminate the negative QCD vacuum effect yielding a vanishingly small CC term.
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