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Physics - Theoretical, Mathematical & Computational Physics | Critical Phenomena in Loop Models

Critical Phenomena in Loop Models

Series: Springer Theses

Nahum, Adam

2015, XVII, 141 p. 38 illus., 36 illus. in color.

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  • Nominated as an outstanding Ph.D. thesis by the University of Oxford, UK
  • Offers a broad perspective on the application of loop models to critical phenomena
  • Relevant to quantum magnetism, disordered systems and polymer physics
  • Introduces new types of geometrical phase transition
  • Advances our understanding of the relation between field theory and random geometry
When close to a continuous phase transition, many physical systems can usefully be mapped to ensembles of fluctuating loops, which might represent for example polymer rings, or line defects in a lattice magnet, or worldlines of quantum particles.
'Loop models' provide a unifying geometric language for problems of this kind.
This thesis aims to extend this language in two directions. The first part of the thesis tackles ensembles of loops in three dimensions, and relates them to the statistical properties of line defects in disordered media and to critical phenomena in two-dimensional quantum magnets. The second part concerns two-dimensional loop models that lie outside the standard paradigms: new types of critical point are found, and new results given for the universal properties of polymer collapse transitions in two dimensions.
All of these problems are shown to be related to sigma models on complex or real projective space, CP^{n−1} or RP^{n−1} -- in some cases in a 'replica' limit -- and this thesis is also an in-depth investigation of critical behaviour in these field theories.

Content Level » Research

Keywords » CP^{n-1} Model - Completely-packed Loop Model - Deconfined Criticality - Fractal Geometry - Loop Gas - Loop Models - Polymer Collapse - Random Geometry - Replica Field Theory - Replica Sigma Model - Self-avoiding Trails - Self-avoiding walk - Vortex Lines - Vortex Percolation

Related subjects » Complexity - Materials - Theoretical, Mathematical & Computational Physics

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