158 articles – 1990 Notices  [english version]
 HAL : in2p3-00321630, version 1
 arXiv : 0809.2013
 Code Bibliographique ADS : 2008arXiv0809.2013B
 Journal of High Energy Physics 0903 (2009) 091
 Dirac Born Infeld (DBI) Cosmic Strings
 E. Babichev1, P. Brax2, C. Caprini2, J. Martin3, D.A. Steer1, 4
 (2009)
 Motivated by brane physics, we consider the non-linear Dirac-Born-Infeld (DBI) extension of the Abelian-Higgs model and study the corresponding cosmic string configurations. The model is defined by a potential term, assumed to be of the mexican hat form, and a DBI action for the kinetic terms. We show that it is a continuous deformation of the Abelian-Higgs model, with a single deformation parameter depending on a dimensionless combination of the scalar coupling constant, the vacuum expectation value of the scalar field at infinity, and the brane tension. By means of numerical calculations, we investigate the profiles of the corresponding DBI-cosmic strings and prove that they have a core which is narrower than that of Abelian-Higgs strings. We also show that the corresponding action is smaller than in the standard case suggesting that their formation could be favoured in brane models. Moreover we show that the DBI-cosmic string solutions are non-pathological everywhere in parameter space. Finally, in the limit in which the DBI model reduces to the Bogomolnyi-Prasad-Sommerfield (BPS) Abelian-Higgs model, we find that DBI cosmic strings are no longer BPS: rather they have positive binding energy. We thus argue that, when they meet, two DBI strings will not bind with the corresponding formation of a junction, and hence that a network of DBI strings is likely to behave as a network of standard cosmic strings.
 équipe(s) de recherche : APC - THEORIE
 Thème(s) : Physique/Astrophysique/Cosmologie et astrophysique extra-galactiquePlanète et Univers/Astrophysique/Cosmologie et astrophysique extra-galactiquePhysique/Relativité Générale et Cosmologie QuantiquePhysique/Physique des Hautes Energies - PhénoménologiePhysique/Physique des Hautes Energies - ThéoriePlanète et Univers/Astrophysique
 Lien vers le texte intégral : http://fr.arXiv.org/abs/0809.2013
 in2p3-00321630, version 1 http://hal.in2p3.fr/in2p3-00321630 oai:hal.in2p3.fr:in2p3-00321630 Contributeur : Simone Lantz <> Soumis le : Mardi 16 Septembre 2008, 11:01:08 Dernière modification le : Lundi 25 Juin 2012, 14:17:04