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Physical properties of the massive Schwinger model from the nonperturbative functional renormalization group
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abstract
We investigate the massive Schwinger model in $d=1+1$ dimensions using bosonization and the nonperturbative functional renormalization group. In agreement with previous studies we find that the phase transition, driven by a change of the ratio $m/e$ between the mass and the charge of the fermions, belongs to the two-dimensional Ising universality class. The temperature and vacuum angle dependence of various physical quantities (chiral density, electric field, entropy density) are also determined and agree with results obtained from density matrix renormalization group studies. Screening of fractional charges and deconfinement occur only at infinite temperature. Our results exemplify the possibility to obtain virtually all physical properties of an interacting system from the functional renormalization group.
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Collective motion in the massive Schwinger model via Tensor Network
Tensor-network simulations of the massive Schwinger model show Bjorken-like hydrodynamics at small m/g and sharp dynamical order parameters marking the parity-breaking phase transition near m/g=0.33 at θ=π.
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