Characterization by detectability inequality for periodic stabilization of linear time-periodic evolution systems

Given a linear time-periodic control system in a Hilbert space with a bounded control operator, we present a characterization of periodic stabilization in terms of a detectability inequality. Similar characterizationwas built up in [E. Trelat, G. Wang, Y. Xu, Characterization by observability inequalities of controllability and stabilization properties, Pure and Appl. Anal., 2 (2020), 93-122] for time-invariant systems.