Dark Matter Stability without New Symmetries
  The stability of dark matter is normally achieved by imposing extra
symmetries beyond those of the Standard Model of Particle Physics. In this
paper we present a framework where the dark matter stability emerges as a
consequence of the Standard Model symmetries. The dark matter particle is an
antisymmetric tensor field (analogous to the one used for spin-1 mesons in
QCD), singlet under the Standard Model gauge group. The Lagrangian possesses an
accidental $Z_2$ symmetry which makes the dark matter stable on cosmological
time scales. Interactions with the Standard Model fields proceed through the
Higgs portal, which allows the observed dark matter abundance to be generated
via thermal freeze-out. We also discuss the prospects for observing this dark
matter particle in direct detection experiments.
