Please use this identifier to cite or link to this item: http://hdl.handle.net/2445/12332
 Title: Effects of friction on cosmic strings Author: Garriga Torres, JaumeSakellariadou, Maria Keywords: Teoria de camps (Física)CosmologiaCordes còsmiquesField theory (Physics)CosmologyCosmic 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 http://dx.doi.org/10.1103/PhysRevD.48.2502 It is part of: Physical Review D, 1993, vol. 48, núm. 6, p. 2502-2515 Related resource: http://dx.doi.org/10.1103/PhysRevD.48.2502 URI: http://hdl.handle.net/2445/12332 ISSN: 0556-2821 Appears in Collections: Articles publicats en revistes (Física de la Matèria Condensada)

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