| Tartalmi leírás: |
Nonlinear sigmamodel includes asymptotic freedom, and spontaneous symmetry breaking, which are features of QCD. If the quark masses are zero, only spontaneous breaking occurs. If the quark masses are nonzero, they break chiral symmetry explicitly, for which the analogous scenario in the O(3) sigmamodel is a H*phi term in the Lagrangian. With this new explicit symmetry breaking term, this thesis answers how the beta function changes using lattice Monte Carlo methods.
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