On the Cauchy problem for scalar conservation laws in the class of   Besicovitch almost periodic functions: global well-posedness and decay   property
  We study the Cauchy problem for a multidimensional scalar conservation law with merely continuous flux vector in the class of Besicovitch almost periodic functions. The existence and uniqueness of entropy solutions are established. We propose also the necessary and sufficient condition for the decay of almost periodic entropy solutions as time $t\to+\infty$. 
Evgeny Yu. Panov
math.AP