Examinando por Autor "Canfora, Fabrizio"

Mostrando 1 - 3 de 3
  • No hay miniatura disponible
    Ítem
    Constraining monopoles by topology: an autonomous system
    (Springer Verlag, 2014-09) Canfora, Fabrizio; Tallarita, Gianni
    We find both analytical and numerical solutions of SU(2) Yang-Mills with an adjoint Higgs field within both closed and open tubes whose sections are spherical caps. This geometry admits a smooth limit in which the space-like metric is flat and, moreover, allows one to use analytical tools which in the flat case are not available. Some of the analytic configurations, in the limit of vanishing Higgs coupling, correspond to magnetic monopoles and dyons living within this tube-shaped domain. However, unlike what happens in the standard case, analytical solutions can also be found in the case in which the Higgs coupling is non-vanishing. We further show that the system admits long-lived breathers.
  • Miniatura
    Ítem
    Cosmological dynamics in higher-dimensional Einstein–Gauss–Bonnet gravity
    (Springer New York LLC, 2014) Canfora, Fabrizio; Giacomini, Alex; Pavluchenko, Sergey A.
    In this paper we perform a systematic classification of the regimes of cosmological dynamics in Einstein–Gauss–Bonnet gravity with generic values of the coupling constants. We consider a manifold which is a warped product of a four dimensional Friedmann–Robertson–Walker space-time with a D-dimensional Euclidean compact constant curvature space with two independent scale factors. A numerical analysis of the time evolution as function of the coupling constants and of the curvatures of the spatial section and of the extra dimension is performed. We describe the distribution of the regimes over the initial conditions space and the coupling constants. The analysis is performed for two values of the number of extra dimensions (D⩾6 both) which allows us to describe the effect of the number of the extra dimensions as well. © 2014, Springer Science+Business Media New York.
  • Miniatura
    Ítem
    Gribov gap equation at finite temperature
    (European Physical Journal C, 2014-07) Canfora, Fabrizio; Canfora, F.; Salgado-Rebolledo, Patricio; Pais, Pablo
    In this paper the Gribov gap equation at finite temperature is analyzed. The solutions of the gap equation (which depend explicitly on the temperature) determine the structure of the gluon propagator within the semi-classical Gribov approach. The present analysis is consistent with the standard confinement scenario for low temperatures, while for high enough temperatures, deconfinement takes place and a free gluon propagator is obtained. An intermediate regime in between the confined and free phases can be read off from the resulting gluon propagator, which appears to be closely related to partial deconfinement. © 2014 The Author(s).