Relaxing a large cosmological constant

Understand

The cosmological constant (CC) problem is the biggest enigma of theoretical physics ever.

• In recent times, it has been rephrased as the dark energy problem in order to encompass a wider spectrum of possibilities.
• It is, in any case, a polyhedric puzzle with many faces, including the cosmic coincidence problem, i.e.
• why the density of matter is presently so close to the CC density.