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This talk summarizes a new understanding of the cosmological constantproblem, which essentially relies on a phase-space-like computation of thevacuum energy, both in the realm of quantum field theory coupled to gravity,and in the realm of a consistent formulation of a quantum theory of gravity andmatter, such as string theory, combined with central properties ofgravitational entropy as captured by the Bekenstein bound. This newunderstanding of the vacuum in a quantum theory of gravity and matter shedslight on the Higgs mass as well as the masses of quarks and leptons.

The Vacuum Energy Problem in Quantum Gravity and the Masses of Elementary Particles