Talk: The 3D Gonihedric Ising Model and its Phase Diagram for κ≠0

  • Date: Jan 17, 2018
  • Time: 11:00 - 12:00
  • Speaker: Simon Schneider
  • Institute of Theoretical Physics, University of Leipzig
  • Location: Max-Planck-Institut für Dynamik und Selbstorganisation (MPIDS)
  • Room: 2.107 (new building)
  • Host: MPIDS
  • Contact:
The gonihedric Ising model was originally introduced as a lattice discretisation of fluctuating surfaces encountered in high-energy physics. The energy penalty of self-intersections of the surface is described by the parameter κ. The model exhibits a phase transition from a ferromagnetic or layered ordered phase to a disordered phase. It has recently sparked interest for its unusual low-temperature phase degeneracy and its effect on the phase transition. The case with no self-intersection penalty is already quite well analysed. Here I present results for nonzero self-intersection cost. Increasing κ changes the nature of the phase transition from first-order to continuous. By employing a flat-histogram Monte Carlo algorithm the phase diagram of the model and the change of nature of the transition
are surveyed. For the continuous transition at κ=1 critical exponents are calculated.
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