  We argue that calculating vacuum energy requires quantum field theory whose
axioms are adapted to curved spacetime. In this context, we suggest that
non-zero vacuum energy is connected to dynamical breaking of electroweak
symmetry. The observed meV scale can be understood in terms of electroweak
physics via a naive estimate. The scenario requires all particle masses to have
a dynamical origin. Any Higgs particle has to be a composite, and the origin of
vacuum energy might be probed at the LHC.
