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Article Dans Une Revue Physical Review D Année : 2021

Charge-velocity-dependent one-scale linear model

C.J.A.P. Martins
  • Fonction : Auteur
I.Yu. Rybak
  • Fonction : Auteur
E.P.S. Shellard
  • Fonction : Auteur

Résumé

We apply a recently developed formalism to study the evolution of a current-carrying string network under the simple but generic assumption of a linear equation of state. We demonstrate that the existence of a scaling solution with nontrivial current depends on the expansion rate of the Universe, the initial root-mean-square current on the string, and the available energy-loss mechanisms. We find that the fast expansion rate after radiation-matter equality will tend to rapidly dilute any preexisting current, and the network will evolve towards the standard Nambu-Goto scaling solution (provided there are no external current-generating mechanisms). During the radiation era, current growth is possible provided the initial conditions for the network generate a relatively large current and/or there is significant early string damping. The network can then achieve scaling with a stable nontrivial current, assuming large currents will be regulated by some leakage mechanism. The potential existence of current-carrying string networks in the radiation era, unlike the standard Nambu-Goto networks expected in the matter era, could have interesting phenomenological consequences.

Dates et versions

hal-03323977 , version 1 (23-08-2021)

Identifiants

Citer

C.J.A.P. Martins, Patrick Peter, I.Yu. Rybak, E.P.S. Shellard. Charge-velocity-dependent one-scale linear model. Physical Review D, 2021, 104 (10), pp.103506. ⟨10.1103/PhysRevD.104.103506⟩. ⟨hal-03323977⟩
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