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International audienceA 'persistence exponent\' $\\theta$ is defined for nonequilibrium critical phenomena. It describes the probability, $p(t) \\sim t^{-\\theta}$, that the global order parameter has not changed sign in the time interval $t$ following a quench to the critical point from a disordered state. This exponent is calculated in mean-field theory, in the $n=\\infty$ limit of the $O(n)$ model, to first order in $\\epsilon = 4-d$, and for the 1-d Ising model. Numerical results are obtained for the 2-d Ising model. We argue that $\\theta$ is a new independent exponent

Global Persistence Exponent for Nonequilibrium Critical Dynamics