Existence and regularity of a nonhomogeneous transition matrix under measurability conditions

This paper is about the existence and regularity of the transition probability matrix of a nonhomogeneous continuous-time Markov process with a countable state space. A standard approach to prove the existence of such a transition matrix is to begin with a continuous (in t >= 0) and conservative matrix Q(t)=[q(ij)(t)] of nonhomogeneous transition rates q(ij)(t) and use it to construct the transition probability matrix. Here we obtain the same result except that the q(ij)(t) are only required to satisfy a mild measurability condition, and Q(t) may not be conservative. Moreover, the resulting transition matrix is shown to be the minimum transition matrix, and, in addition, a necessary and sufficient condition for it to be regular is obtained. These results are crucial in some applications of nonhomogeneous continuous-time Markov processes, such as stochastic optimal control problems and stochastic games, and this was the main motivation for this work.