Energy-Momentum Tensors for the Quark-Gluon Plasma
  We construct the energy-momentum tensor for the gauge fields which describe the collective excitations of the quark-gluon plasma. We rely on the description of the collective modes that we have derived in previous works. By using the conservation laws for energy and momentum, we obtain three different versions for the tensor $T^{\mu\nu}$, which are physically equivalent. We show that the total energy constructed from $T^{00}$ is positive for any non-trivial field configuration. Finally, we present a new non-abelian solution of the equations of motion for the gauge fields. This solution corresponds to spatially uniform color oscillations of the plasma. 
Jean-Paul Blaizot and Edmond Iancu