Real Space Migdal-Kadanoff Renormalisation of Glassy Systems: Recent Results and a Critical Assessment

Abstract : In this manuscript, in honour of L. Kadanoff, we present recent progress obtained in the description of finite dimensional glassy systems thanks to the Migdal-Kadanoff renormalisation group (MK-RG). We provide a critical assessment of the method, in particular discuss its limitation in describing situations in which an infinite number of pure states might be present, and analyse the MK-RG flow in the limit of infinite dimensions. MK-RG predicts that the spin-glass transition in a field and the glass transition are governed by zero-temperature fixed points of the renormalization group flow. This implies a typical energy scale that grows, approaching the transition, as a power of the correlation length, thus leading to enormously large time-scales as expected from experiments and simulations. These fixed points exist only in dimensions larger than $d_L>3$ but they nevertheless influence the RG flow below it, in particular in three dimensions. MK-RG thus predicts a similar behavior for spin-glasses in a field and models of glasses and relates it to the presence of avoided critical points.
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Journal of Statistical Physics, Springer Verlag, 2017, 167, pp.476-498. 〈10.1007/s10955-017-1748-4〉
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Maria Chiara Angelini, Giulio Biroli. Real Space Migdal-Kadanoff Renormalisation of Glassy Systems: Recent Results and a Critical Assessment. Journal of Statistical Physics, Springer Verlag, 2017, 167, pp.476-498. 〈10.1007/s10955-017-1748-4〉. 〈cea-01546913〉

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