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Title: Effects of friction on cosmic strings
Author: Garriga Torres, Jaume
Sakellariadou, Maria
Keywords: Teoria de camps (Física)
Cordes còsmiques
Field theory (Physics)
Cosmic strings
Issue Date: 1993
Publisher: The American Physical Society
Abstract: We study the evolution of cosmic strings taking into account the frictional force due to the surrounding radiation. We consider small perturbations on straight strings, oscillation of circular loops, and small perturbations on circular loops. For straight strings, friction exponentially suppresses perturbations whose comoving scale crosses the horizon before the cosmological time ${t}_{*}\ensuremath{\sim}{\ensuremath{\mu}}^{\ensuremath{-}2}$ (in Planck units), where $\ensuremath{\mu}$ is the string tension. Loops with a size much smaller than ${t}_{*}$ will be approximately circular at the time when they start the relativistic collapse. We investigate the possibility that such loops will form black holes. We find that the number of black holes which are formed through this process is well below present observational limits, so this does not give any lower or upper bounds on $\ensuremath{\mu}$. We also consider the case of straight strings attached to walls and circular holes that can spontaneously nucleate on metastable domain walls.
Note: Reproducció digital del document publicat en format paper, proporcionada per PROLA i
It is part of: Physical Review D, 1993, vol. 48, núm. 6, p. 2502-2515
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ISSN: 0556-2821
Appears in Collections:Articles publicats en revistes (Física de la Matèria Condensada)

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