A cosmological constant from the QCD trace anomaly?

Details A cosmological constant from the QCD trace anomaly? A cosmological constant from the QCD trace anomaly?

2002-04-04

arxiv.org/abs/gr-qc/0204018v1

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

4 pages, RevTeX

Scientific paper

10.1103/PhysRevLett.89.081302

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.

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