WKB periods for higher order ODE and TBA equations

Abstract

We study the WKB periods for the $(r+1)$-th order ordinary differential equation (ODE) which is obtained by the conformal limit of the linear problem associated with the $A_r^{(1)}$ affine Toda field equation. We compute the quantum corrections by using the Picard-Fuchs operators. The ODE/IM correspondence provides a relation between the Wronskians of the solutions and the Y-functions which satisfy the thermodynamic Bethe ansatz (TBA) equation related to the Lie algebra $A_r$. For the quadratic potential, we propose a formula to show the equivalence between the logarithm of the Y-function and the WKB period, which is confirmed by solving the TBA equation numerically.

arXiv comment1+31 pages, references added, typos corrected, discussions on wall-crossing added, published version

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Cited by in corpus (2)

• Exact WKB methods in $SU(2)$ $N_f=1$
• Wall-crossing of TBA equations and WKB periods for the third order ODE