Is the cosmological "constant" a nonlocal quantum residue of discreteness of the causal set type?

Understand

The evidence for an accelerating Hubble expansion appears to have confirmed the heuristic prediction, from causal set theory, of a fluctuating and ``ever-present'' cosmological term in the Einstein equations.

• A more concrete phenomenological model incorporating this prediction has been devised and tested, but it remains incomplete.
• I will review these developments and also mention a possible consequence for the dimensionality of spacetime.