Charge-velocity-dependent one-scale linear model
Autor: | C. J. A. P. Martins, Patrick Peter, E. P. S. Shellard, I. Yu. Rybak |
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Přispěvatelé: | Institut d'Astrophysique de Paris (IAP), Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS) |
Jazyk: | angličtina |
Rok vydání: | 2021 |
Předmět: |
Physics
string: network Cosmology and Nongalactic Astrophysics (astro-ph.CO) Scale (ratio) model: linear 010308 nuclear & particles physics energy loss scaling FOS: Physical sciences stability equation of state: linear 01 natural sciences Stability (probability) String (physics) boundary condition Root mean square 0103 physical sciences Boundary value problem Statistical physics Current (fluid) [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph] 010306 general physics Scaling Linear equation Astrophysics - Cosmology and Nongalactic Astrophysics |
Zdroj: | Phys.Rev.D Phys.Rev.D, 2021, 104 (10), pp.103506. ⟨10.1103/PhysRevD.104.103506⟩ |
Popis: | 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 non-trivial 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 pre-existing 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 non-trivial 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. 21 pages, 9 figures |
Databáze: | OpenAIRE |
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