Well-posedness and global extensibility criteria for time-fractionally damped Jordan--Moore--Gibson--Thompson equation

In this paper, we consider the Jordan–Moore–Gibson–Thompson with a time-fractional damping term of the type $\delta {\text{D}}_t^{1-\alpha }\mathrm{\Delta }\text{psit}$ where we allow the challenging so-called critical case ($\delta =0$). This equation arises in the context of acoustic propagation through thermally relaxed media. We tackle the question of long-time existence of the solution. More precisely, the goal of the paper is twofold: First, we establish local well-posedness of the initial boundary value problem, where we also provide a lower bound on the final time of existence as a function of initial data. Second, we prove a regularity result which guarantees, under the hypothesis of boundedness of certain quantities, that the local solution can be extended to be global-in-time.