Wednesday, January 23, 2013

1301.5219 (Bertrand Berche et al.)

The two-dimensional 4-state Potts model in a magnetic field    [PDF]

Bertrand Berche, Paolo Butera, Lev Shchur
We present a solution of the non-linear renormalization group equations leading to the dominant and subdominant singular behaviours of physical quantities (free energy density, correlation length, internal energy, specific heat, magnetization, susceptibility and magnetocaloric coefficient) at the critical temperature in a non- vanishing magnetic field. The solutions i) lead to exact cancellation of logarithmic corrections in universal amplitude ratios and ii) prove recently proposed relations among logarithmic exponents.
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