A cosmological constant from the QCD trace anomaly?

TL;DR

This paper explores whether the QCD trace anomaly's non-perturbative effects could account for the observed cosmological constant, suggesting a potential link between quantum field effects and cosmic acceleration.

Contribution

It proposes that the QCD trace anomaly might produce a cosmological constant consistent with observations, highlighting a novel quantum field contribution to cosmology.

Findings

Order of magnitude estimate matches empirical data

QCD trace anomaly could influence cosmic acceleration

Potential link between quantum effects and dark energy

Abstract

According to recent astrophysical observations the large scale mean pressure of our present universe is negative suggesting a positive cosmological constant like term. This article addresses the question of whether non-perturbative effects of self-interacting quantum fields in curved space-times may yield a significant contribution. Focusing on the trace anomaly of quantum chromo-dynamics (QCD), a preliminary estimate of the expected order of magnitude yields a remarkable coincidence with the empirical data, indicating the potential relevance of this effect. PACS: 04.62.+v, 12.38.Aw, 12.38.Lg, 98.80.Es.