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Charge-velocity-dependent one-scale linear model.
- Source :
-
Physical Review D: Particles, Fields, Gravitation & Cosmology . 11/15/2021, Vol. 104 Issue 10, p1-1. 1p. - Publication Year :
- 2021
-
Abstract
- 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. [ABSTRACT FROM AUTHOR]
- Subjects :
- *EQUATIONS of state
*LINEAR equations
Subjects
Details
- Language :
- English
- ISSN :
- 24700010
- Volume :
- 104
- Issue :
- 10
- Database :
- Academic Search Index
- Journal :
- Physical Review D: Particles, Fields, Gravitation & Cosmology
- Publication Type :
- Periodical
- Accession number :
- 153970841
- Full Text :
- https://doi.org/10.1103/PhysRevD.104.103506