Astronomy and Astrophysics – Astrophysics – General Relativity and Quantum Cosmology
Scientific paper
2002-04-08
Astronomy and Astrophysics
Astrophysics
General Relativity and Quantum Cosmology
5 pages. To be published in the Proc. 11th JGRG ed. by K. Maeda et al
Scientific paper
Under the assumption that the cosmological constant vanishes in the true ground state with lowest possible energy density, we argue that the observed small but finite vacuum-like energy density can be explained if we consider a theory with two or more degenerate perturbative vacua, which are unstable due to quantum tunneling, and if we still live in one of such states. An example is given making use of the topological vacua in non-Abelian gauge theories.
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