Résumé / Abstract Seminaire_GReCO

"Coupled currents in cosmic strings"

M. Lilley

After an introduction to the single current carrying cosmic string from the field theory side and in Carter''s macroscopic description, I will show how both formalisms can be simply extended to a string carrying more than one current. I will then discuss the conditions for stability of the string if transverse and/or longitudinal perturbations of the currents are included. I will also give numerical examples to show that, in the weak coupling limit, the physics of a string carrying several currents is well reproduced by an analytic model in which the worldsheet Lagrangian of each string is approximated by, on the one hand, a logarithmic function of two parameters for timelike currents, and by, on the other hand, a rational function of two parameters for spacelike currents.

lundi 27 avril 2009 - 11:00
Salle des séminaires Évry Schatzman,
Institut d'Astrophysique de Paris

Page web du séminaire / Seminar's webpage