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Physical Review D 78 (2008) 023521
Statistical mechanics of strings with Y-junctions
R.J. Rivers, D.A. Steer1, 2

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.
1 :  APC - UMR 7164 - AstroParticule et Cosmologie
2 :  CERN - European Organization for Nuclear Research
Physique/Physique des Hautes Energies - Théorie

Physique/Astrophysique/Phénomènes cosmiques de haute energie

Planète et Univers/Astrophysique/Phénomènes cosmiques de haute energie
Particle-theory and field-theory models of the early Universe
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