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In this work we consider the influence of mass media in the dynamics of thetwo-dimensional Sznajd model. This influence acts as an external field, and itis introduced in the model by means of a probability $p$ of the agents tofollow the media opinion. We performed Monte Carlo simulations on squarelattices with different sizes, and our numerical results suggest a change onthe critical behavior of the model, with the absence of the usual phasetransition for $p>\sim 0.18$. Another effect of the probability $p$ is todecrease the average relaxation times $\tau$, that are log-normallydistributed, as in the standard model. In addition, the $\tau$ values depend onthe lattice size $L$ in a power-law form, $\tau\sim L^{\alpha}$, where thepower-law exponent depends on the probability $p$.

Effects of mass media on opinion spreading in the Sznajd sociophysics model