Dynamics of the Ising chain with four-spin interactions in a disordered transverse magnetic field

We study the time dependent behavior of the four-spin interactions Ising ch ain in the presence of a disordered transverse magnetic field. In order to analyze the effects of field randomness in the dynamical behavior of the sy stem we calculate the time-dependent correlation function and the longitudi nal relaxation function of the infinite chain. S;Ve consider a bi-modal dis tribution for the field energy strength, where one of its values equals the exchange coupling energy while the other value can be lower or higher than the coupling energy. We find that an increasing concentration of weaker fi elds produces an enhancement of the central mode behavior. However, when th e concentration of stronger fields increases, the system undergoes a crosso ver from central mode to collective-type dynamics.