Small cosmological constant from the QCD trace anomaly?


According to recent astrophysical observations the large scale mean pressure of our present Universe is negative suggesting a positive cosmological constant-like term. The issue of whether nonperturbative effects of self-interacting quantum fields in curved space-times may yield a significant contribution is addressed. Focusing on the trace anomaly of quantum chromodynamics, a preliminary estimate of the expected order of magnitude yields a remarkable coincidence with the empirical data, indicating the potential relevance of this effect.

Cite this paper

@article{Schtzhold2002SmallCC, title={Small cosmological constant from the QCD trace anomaly?}, author={R. Sch{\"{u}tzhold}, journal={Physical review letters}, year={2002}, volume={89 8}, pages={081302} }