Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
1994-10-13
Nucl.Phys. B437 (1995) 471-488
Physics
High Energy Physics
High Energy Physics - Theory
20 pages, 8 figures (uuencoded) appended, DAMTP-94-56, SUSX-TP-94-72
Scientific paper
10.1016/0550-3213(94)00593-4
We investigate numerically the configurational statistics of strings. The algorithm models an ensemble of global $U(1)$ cosmic strings, or equivalently vortices in superfluid $^4$He. We use a new method which avoids the specification of boundary conditions on the lattice. We therefore do not have the artificial distinction between short and long string loops or a `second phase' in the string network statistics associated with strings winding around a toroidal lattice. Our lattice is also tetrahedral, which avoids ambiguities associated with the cubic lattices of previous work. We find that the percentage of infinite string is somewhat lower than on cubic lattices, 63\% instead of 80\%. We also investigate the Hagedorn transition, at which infinite strings percolate, controlling the string density by rendering one of the equilibrium states more probable. We measure the percolation threshold, the critical exponent associated with the divergence of a suitably defined susceptibility of the string loops, and that associated with the divergence of the correlation length.
Hindmarsh Mark
Strobl Karl
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