This is the typical length scale of quantum gravity and
the length associated to the vacuum energy is thus at
least some 60 orders of magnitude larger, a very unnatural
value. Using mass instead of length scales (through
the relation m = c/), we have mΛ ∼ 10−33 eV,
whereas mP ∼ 1027 eV. This huge difference of scales
summarizes the infamous cosmological constant problem
or, one should say more precisely, the vacuum energy
problem.