Mirror QCD and Cosmological Constant

TL;DR

This paper investigates how a mirror QCD sector could influence the cosmological constant and explores the possibility that trace anomaly cancellation between QCD and mirror QCD could suppress their contributions to the cosmological constant, based on non-perturbative analysis.

Contribution

It proposes a hypothesis for trace anomaly cancellation between QCD and mirror QCD, potentially explaining the smallness of the cosmological constant through non-perturbative analysis.

Findings

Trace anomaly cancellation could suppress the cosmological constant contributions.

Non-perturbative solutions suggest specific infrared behavior of mirror QCD.

Hypothesized anomaly cancellation could lead to a near-zero cosmological constant.

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 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.