Real-time dynamics of the O(N) model in 1+1 dimensions
نویسنده
چکیده
We study the non-equilibrium dynamics of the O(N) model in classical and quantum field theory in 1+1 dimensions, forN > 1. We compare numerical results obtained using the Hartree approximation and two next to leading order approximations, the bare vertex approximation and the 2PI-1/N expansion. The later approximations differ through terms of order g, where g is the scaled coupling constant, g = λ/N . In this paper we investigate the statement regarding the convergence with respect to g. We find that the differences between these two approximation schemes diminish for larger values of N , when λ is fixed.
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تاریخ انتشار 2005