7 research outputs found

    Decay of the metastable phase in d=1 and d=2 Ising models

    Full text link
    We calculate perturbatively the tunneling decay rate Γ\Gamma of the metastable phase in the quantum d=1 Ising model in a skew magnetic field near the coexistence line 0<hx<1,hz00<h_{x}<1, h_{z}\to -0 at T=0. It is shown that Γ\Gamma oscillates in the magnetic field hzh_{z} due to discreteness of the excitation energy spectrum. After mapping of the obtained results onto the extreme anisotropic d=2 Ising model at T<TcT<T_c, we verify in the latter model the droplet theory predictions for the free energy analytically continued to the metastable phase. We find also evidence for the discrete-lattice corrections in this metastable phase free energy.Comment: 4 pages, REVTe

    The classical nucleation rate in two dimensions

    No full text

    Kinks and particles in non-integrable quantum field theories

    No full text
    In this talk we discuss an elementary derivation of the semi-classical spectrum of neutral particles in two field theories with kink excitations. We also show that, in the non-integrable cases, each vacuum state cannot generically support more than two stable particles, since all other neutral excitations are resonances, which will eventually decay
    corecore