• Conference Object  

      Aspects of string cosmology 

      Kounnas, Costas; Toumbas, Nicolaos K. (Proceedings of Science (PoS), 2012)
      We review recent progress in string cosmology, where string dualities are applied so as to obtain complete cosmological evolutions, free of any essential singularities. Two classes of models are analyzed. The first class ...
    • Article  

      Change of θ dependence in 4D SU(N) gauge theories across the deconfinement transition 

      Bonati, C.; D'Elia, M.; Panagopoulos, Haralambos G.; Vicari, E. (2013)
      We study the dependence of 4D SU(N) gauge theories on the topological θ term at finite temperature T. We exploit the lattice formulation of the theory, presenting numerical results for the expansion of the free energy up ...
    • Conference Object  

      Perturbative renormalization of staggered fermion operators with stout improvement: Application to the magnetic susceptibility of QCD 

      Bali, G. S.; Bruckmann, F.; Constantinou, Martha; Costa, Marios Gil; Endrödi, Gergely; Katz, Sándor D.; Panagopoulos, Haralambos G.; Schäfer, A. (Proceedings of Science (PoS), 2013)
      We calculate the fermion propagator and the quark-antiquark Green's functions for a complete set of ultralocal fermion bilinears, Γ [Γ: scalar (S), pseudoscalar (P), vector (V), axial (A) and tensor (T)], using perturbation ...
    • Conference Object  

      θ Dependence of 4D SU(N) gauge theories at finite temperature 

      Bonati, C.; D'Elia, M.; Panagopoulos, Haralambos G.; Vicari, E. (Proceedings of Science (PoS), 2013)
      We report a study of the dependence of 4D SU(N) gauge theories on the topological θ term at finite temperature, and in particular in the large-N limit. We show that theθ dependence drastically changes across the deconfinement ...