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Generic features of the fluctuation dissipation relation in coarsening systems

Federico Corberi·Claudio Castellano·Eugenio Lippiello·Marco Zannetti
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Abstract

The integrated response function in phase-ordering systems with scalar, vector, conserved and non conserved order parameter is studied at various space dimensionalities. Assuming scaling of the aging contribution $χ_{ag} (t,t_w)= t_w ^{-a_χ} \hat χ(t/t_w)$ we obtain, by numerical simulations and analytical arguments, the phenomenological formula describing the dimensionality dependence of $a_χ$ in all cases considered. The primary result is that $a_χ$ vanishes continuously as $d$ approaches the lower critical dimensionality $d_L$. This implies that i) the existence of a non trivial fluctuation dissipation relation and ii) the failure of the connection between statics and dynamics are generic features of phase ordering at $d_L$.

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Federico Corberi, Claudio Castellano, Eugenio Lippiello, Marco Zannetti. 2003-11-03. Generic features of the fluctuation dissipation relation in coarsening systems. https://doi.org/10.1103/physreve.70.017103

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