Download Analysis of Quantised Vortex Tangle by Alexander John Taylor PDF

By Alexander John Taylor

In this thesis, the writer develops numerical recommendations for monitoring and characterising the convoluted nodal traces in 3-dimensional house, analysing their geometry at the small scale, in addition to their international fractality and topological complexity---including knotting---on the big scale. The paintings is extremely visible, and illustrated with many attractive diagrams revealing this unanticipated point of the physics of waves. Linear superpositions of waves create interference styles, this means that in a few locations they enhance each other, whereas in others they thoroughly cancel one another out. This latter phenomenon happens on 'vortex traces' in 3 dimensions. typically wave superpositions modelling e.g. chaotic hollow space modes, those vortex strains shape dense tangles that experience by no means been visualised at the huge scale sooner than, and can't be analysed mathematically by means of any identified options.

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2 how they behave in a sum of 100 monochromatic plane waves; the vortices bend and tangle very similarly to our earlier example with just 20 superposing waves. The properties of these line tangles have been examined in the literature; [34] investigates many of their statistics in three dimensions, including mean densities, speeds of vortex lines in non-monochromatic superpositions, and the local geometric characteristics of the ellipse describing phase line anisotropy about a vortex core. This work also includes some two-dimensional correlation functions of complex phase singularities.

The principal signature of this phenomenon will be in the fractality of each of the long vortex lines, since a truly random curve demands a certain kind of scale 28 1 Introduction invariance in the statistics of the motion. We will investigate if such a scaling holds, and other related quantities, in Chaps. 3 and 5. There has been much interest in the topology of random walks, particularly arising from their status as models for the behaviour of different kinds of polymers [3, 6]; in such systems, the large scale behaviour of polymers may be strongly affected by their topology, and so it is important to understand how it behaves as a function of their local geometry and physical effects such as an excluded volume about other molecules.

One of the earliest examples determined experimentally was in DNA, in which the interaction of geometrical and topological constraints is a vital part of how a cell can pack many metres of the extended molecule (itself a twisted double helix under mechanical constraints) into its nucleus, while also extracting segments of the chain to be read [52]. 5 Knotting and Linking as a Statistical Tool 25 with implications for its behaviour [53]. Similar concepts appear in proteins, which are generally considered as open curves but may be considered as knotted under some reasonable definition [54].

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