• 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 ...
    • Article  

      Eight-Dimensional Quantum Hall Effect and "Octonions" 

      Bernevig, B. A.; Hu, J.; Toumbas, Nicolaos K.; Zhang, S. -C (2003)
      A generalization of the quantum Hall effect (QHE) where particles move in an eight-dimensional space under an SO(8) gauge field was constructed. A nonrelativistic Hamiltonian for particles moving on the S8 in the presence ...
    • Conference Object  

      Novel nonlocal gauge functions in electrodynamics and their effect on quantum mechanical phases 

      Moulopoulos, Konstantinos (2011)
      We point to previously overlooked solutions of the standard gauge transformation equations of Electrodynamics: the generalized "gauge functions" go beyond the usual Dirac phase factors (spatial or temporal integrals of ...
    • Article  

      Simulating a CP-violating topological term in gauge theories 

      Panagopoulos, Haralambos G.; Vicari, E. (2012)
      We present recent results on the θ-dependence of four-dimensional SU(N) gauge theories, where θ is the coefficient of the CP-violating topological term in the Lagrangian. In particular, we study the scaling behavior of ...
    • Article  

      SU(N) gauge theories in the presence of a topological term 

      Debbio, L. D.; Panagopoulos, Haralambos G.; Vicari, E. (2008)
      We review recent results on the θ dependence of the ground-state energy and spectrum of four-dimensional SU(N) gauge theories, where θ is the coefficient of the CP-violating topological term F F in the Lagrangian. In ...
    • Conference Object  

      Two-loop renormalization of fermion bilinears on the lattice 

      Skouroupathis, A.; Panagopoulos, Haralambos G. (2009)
      We compute the renormalization functions on the lattice, in the RI′ scheme, of local bilinear quark operators ψ̄ Γψ, where Γ = Î, γ5, γμ, γ5, γμ, γ5 σμν. This calculation is carried out to two loops for the first time. We ...
    • 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 ...