Preprints - Computational



The information that appears here has been provided by the different authors. The rather arbitrary ordering of the papers corresponds to the order in which the authors have informed the network. In principle the scope of the list is restricted to those papers written in the realm of Defect Formation and Non-equilibrium Field Theory, with support from the ESF. The links to abstract, source, other formats, and authors' list of papers are to the Spanish mirror of the xxx archives. After each entry, however, links have been set up to the postscript files located at the Los Alamos server and to the European mirrors. It is not unlikely (actually, it is very likely) that errors in the links will have escaped my attention. If so, please let me know. 

hep-ph/9708427 [abs, src, ps, other] :

Title: Numerical simulations of string networks in the Abelian-Higgs model

Authors: Graham Vincent, Nuno D. Antunes, Mark Hindmarsh.

We present the results of a field theory simulation of networks of strings in the Abelian Higgs model. Starting from a random initial configuration we show that the resulting vortex tangle approaches a self-similar regime in which the length density of lines of zeros of $\phi$ reduces as $t^{-2}$. We demonstrate that the network loses energy through processes operating at the string width. These results support a recent claim that particle production, and not gravitational radiation, is the dominant energy loss mechanism for cosmic strings. This means that GUT-scale cosmic strings are severely constrained by high energy cosmic ray fluxes: either they are ruled out, or an implausibly small fraction of their energy ends up in quarks and leptons.

Postscript from: Los Alamos, Zaragoza, Trieste, Paris, Augsburg, Southampton, Moscow.


hep-ph/9801223 [abs, src, ps, other] :

Title: Vortex formation in two dimensions: When symmetry breaks, how big are the pieces?

Authors: Andrew Yates, Wojciech H. Zurek.

We investigate the dynamics of second order phase transitions in two dimensions, breaking a gauged U(1) symmetry. Using numerical simulations, we show that the density of topological defects formed scales with the quench timescale $\tau_Q$ as $n \sim \tau_Q^{-1/2}$ when the dynamics is overdamped at the instant when the freezeout of thermal fluctuations takes place, and $n \sim \tau_Q^{-2/3}$ in the underdamped case. This is predicted by the scenario proposed by one of us [1].

Postscript from: Los Alamos, Zaragoza, Trieste, Paris, Augsburg, Southampton, Moscow.



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