  We argue that TeVeS-like vector fields appear naturally in certain string
theory backgrounds involving D0-branes, as a result of the recoil velocity
field, expressing the interaction of neutrino string matter with point-like
branes. However, the similarity with TeVeS models is restricted only to the
bi-metric properties of space time, namely the difference of the background
metric from the one felt by (some) matter fields interacting, in a
topologically non-trivial manner, with the D0-brane defects. In our approach,
neutrinos appear as dark matter candidates that could be ``captured'' by the D0
branes, as a result of stringy properties, and thus couple with the
recoil-vector fields. Moreover, we argue in support of a possibly preferential
role of neutrinos in inducing novel non-perturbative contributions to
``vacuum'' (dark) energy, in addition to their ordinary dark matter
contribution. In fact, the role of neutrinos as providing substantial
contributions to dark matter and dark energy components of the Universe,
suggested by our approach, appears also to be necessitated by the need to
reproduce the peaks in the Cosmic Microwave Background radiation spectrum, as
claimed recently in the literature. Thus, our framework may be viewed as
providing a microscopic explanation of such phenomenological conclusions
concerning TeVeS-like, Lorentz-violating models.
