de Sitter SpaceTime’s maximally symmetric
Curving constantly positive solves vacuum
Equations for Einstein’s cosmological
Constant resolve,
Observationally relevant .
Approximates early universal inflation,
Accounts for an energy density
Relational increase to cosmic expansion .

On entering a second de Sitter phase :
A transition from a large cosmic constant
With a tiny radius of curvature
To the future de Sitter dark energy
Emergent of the constant current ;  enormous,
The radius of curvature close to Hubble scale .

*[ WSB ]_.