Statistical mechanics of strings with Y-junctions

Details Statistical mechanics of strings with Y-junctions Statistical mechanics of strings with Y-junctions

2008-03-27

arxiv.org/abs/0803.3968v1

Phys.Rev.D78:023521,2008

Physics

High Energy Physics

High Energy Physics - Theory

Scientific paper

10.1103/PhysRevD.78.023521

We investigate the Hagedorn transitions of string networks with Y-junctions as may occur, for example, with (p,q) cosmic superstrings. In a simplified model with three different types of string, the partition function reduces to three generalised coupled XY models. We calculate the phase diagram and show that, as the system is heated, the lightest strings first undergo the Hagedorn transition despite the junctions. There is then a second, higher, critical temperature above which infinite strings of all tensions, and junctions, exist. Conversely, on cooling to low temperatures, only the lightest strings remain, but they collapse into small loops.

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