Short-time dynamic exponents of an Ising model with competing interactions

In this work the two-dimensional Ising model with nearest- and next-nearest-neighbor interactions is revisited. We obtain the dynamic critical exponents z and theta from short-time Monte Carlo simulations. The dynamic critical exponent z is obtained from the time behavior of the ratio F-2 = <M-2>m(0) =0/<M>(2)(m0 = 1) similar tot(d/z), whereas the non-universal I exponent theta is estimated from the time correlation of the order parameter <M(0)M(t)> similar to t(theta), where M(t) is the order parameter at instant t, d is the dimension of the system and <(...)> is the average of the quantity (...) over different samples. We also obtain the static critical exponents beta and v by investigating the time behavior of the magnetization.