  Recently we argued that a particular model of string-inspired quantum
space-time foam (D-foam) may induce oscillations and mixing among flavoured
particles. As a result, rather than the mass-eigenstate vacuum, the correct
ground state to describe the underlying dynamics is the flavour vacuum,
proposed some time ago by Blasone and Vitiello as a description of quantum
field theories with mixing. At the microscopic level, the breaking of
target-space supersymmetry is induced in our space-time foam model by the
relative transverse motion of brane defects. Motivated by these results, we
show that the flavour vacuum, introduced through an inequivalent representation
of the canonical (anti-) commutation relations, provides a vehicle for the
breaking of supersymmetry (SUSY) at a low-energy effective field theory level;
on considering the flavour-vacuum expectation value of the energy-momentum
tensor and comparing with the form of a perfect relativistic fluid, it is found
that the bosonic sector contributes as dark energy while the fermion
contribution is like dust. This indicates a strong and novel breaking of SUSY,
of a non-perturbative nature, which may characterize the low energy field
theory of certain quantum gravity models.
