Convergence Rates in Parabolic Homogenization with Time-Dependent   Periodic Coefficients
  For a family of second-order parabolic systems with bounded measurable, rapidly oscillating and time-dependent periodic coefficients, we investigate the sharp convergence rates of weak solutions in $L^2$. Both initial-Dirichlet and initial-Neumann problems are studied. 
Jun Geng and Zhongwei Shen
math.AP