8,045 research outputs found
Four results on phi^4 oscillons in D+1 dimensions
We present four results for oscillons in classical phi^4 theory in D+1
space-time dimensions, based on numerical simulations. These include the
oscillon lifetime and the dependence on D; evidence for the uniqueness of the
oscillon; evidence for the existence of oscillons beyond D=7; and a brief study
of the spectrum of the radiation emitted from the oscillons before, during and
after its ultimate demise.Comment: 12 pages, 16 figure
Graphics Hardware Implementation of the Parameter-Less Self-Organising Map
This paper presents a highly parallel implementation of a new type of Self-Organising Map (SOM) using graphics hardware. The Parameter-Less SOM smoothly adapts to new data while preserving the mapping formed by previous data. It is therefore in principle highly suited for interactive use, however for large data sets the computational requirements are prohibitive. This paper will present an implementation on commodity graphics hardware which uses two forms of parallelism to signi¯cantly reduce this barrier. The performance is analysed experi- mentally and algorithmically. An advantage to using graphics hardware is that visualisation is essentially free", thus increasing its suitability for interactive exploration of large data sets
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