  The recent OPERA experiment of superluminal neutrinos has deep consequences
in cosmology. In cosmology a fundamental constant is the cosmological constant.
From observations one can estimate the effective cosmological constant
$\Lambda_{eff}$ which is the sum of the quantum zero point energy
$\Lambda_{dark energy}$ and the geometric cosmological constant $\Lambda$. The
OPERA experiment can be applied to determine the geometric cosmological
constant $\Lambda$. It is the first time to distinguish the contributions of
$\Lambda$ and $\Lambda_{dark energy}$ from each other by experiment. The
determination is based on an explanation of the OPERA experiment in the
framework of Special Relativity with de Sitter space-time symmetry.
