In the NJL model, rho meson masses for different charge and spin states increase or decrease with magnetic field at zero temperature, decrease with temperature at fixed B, approach constituent quark masses at high T, and exhibit degeneracies under combined finite B and T.
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$\rho$ mesons in finite magnetic field and finite temperature
In the NJL model, rho meson masses for different charge and spin states increase or decrease with magnetic field at zero temperature, decrease with temperature at fixed B, approach constituent quark masses at high T, and exhibit degeneracies under combined finite B and T.