  The possibility of physics beyond the standard model is studied. The
requirement of finiteness of the zero point energy density and pressure or the
requirement of the Lorentz invariance of the zero point stress-energy tensor in
Minkowski space-time, implies regularization sum rules on the number of degrees
of freedom and mass of fundamental particles spectrum. The consequences of
these sum rules on the existence of particles beyond the standard model is
studied. If these sum rules are to be satisfied, it is shown that some simple
and minimal extensions of the standard model such as the two Higgs doublet
model, right handed neutrinos, mirror symmetry can not be complete extensions
in their current forms. The only exception is unbroken supersymmetry and maybe
broken supersymmetry. A comparison between different regularization schemes is
also done. It is shown that while all considered regularization schemes give a
Lorentz invariant expression for the zero point stress-energy tensor in
Minkowski space, their physical interpretations are quite different.
