The critical Ising model on a torus with a defect line

A. Poghosyan, Ralph Kenna, N. Izmailian

    Research output: Contribution to journalArticlepeer-review

    6 Citations (Scopus)
    84 Downloads (Pure)


    The critical Ising model in two dimensions with a specific defect line is analyzed to deliver the first exact solution with twisted boundary conditions. We derive exact expressions for the eigenvalues of the transfer matrix and obtain analytically the partition function and the asymptotic expansions of the free energy and inverse correlation lengths for an infinitely long cylinder of circumference L x . We find that finite-size corrections to scaling are of the form $a_k/L^{2k-1}_x$ for the free energy f and $b_k(p)/L_x^{2k-1}$ and $c_k(p)/L_x^{2k-1}$ for inverse correlation lengths $\xi^{-1}_p$ and $\xi^{-1}_{L-p}$ , respectively, with integer values of k. By exact evaluation we find that the amplitude ratios $b_k(p)/a_k$ and $c_k(p)/a_k$ are universal and verify this universal behavior using a perturbative conformal approach.
    Original languageEnglish
    Issue number6
    Publication statusPublished - 12 Oct 2015


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