Universal amplitude ratios for scaling corrections on Ising strips with fixed boundary conditions Original Research Article

We study the (analytic) finite-size corrections in the Ising model on the strip with fixed (+−) boundary conditions. We find that subdominant finite-size corrections to scaling should be to the form image for the free energy image and image for inverse correlation length image, with integer value of k. We investigate the set image by exact evaluation and their changes upon varying anisotropy of coupling. We find that the amplitude ratios image remain constant upon varying coupling anisotropy. Such universal behavior are correctly reproduced by the conformal perturbative approach.