Effective Temperatures in Driven Systems: Static vs. Time-Dependent   Relations
  Using simulations of glassy systems under steady-state shear, we compare effective temperatures obtained from static linear response with those from time-dependent fluctuation-dissipation relations. Although these two definitions are not expected to agree, we show that they yield the same answer over two and a half decades of effective temperature. This suggests that a more complete conceptual framework is necessary for effective temperatures in steady-state driven systems. 
C. S. O'Hern, A. J. Liu, and S. R. Nagel