$\Lambda$CDM as image of open de Sitter

The open de Sitter universe presents a cosmological model with many favorable properties, conservation of nonlocal energy in particular. Several arguments suggest that the extrinsic curvature of open de Sitter appears exclusively as curvature of time, so that space is flat. Open de Sitter is shown to be equivalent to the flat $\Lambda$CDM model through a transformation of curvature energy to matter energy, involving a boost of the time coordinate, and yielding an analytical density of dust $\Omega_{\textrm{m}}=[1+\sinh^{2}(\sqrt{2}\,\textrm{asinh}(1))]^{-1}=0.2822...$, making open de Sitter also observationally viable.