Finite-size corrections to the crosscap overlap in the two-dimensional Ising model
This research investigates finite-size corrections to the crosscap overlap in the 2D classical Ising model along its self-dual critical line. The study finds that these corrections decay exponentially with system size, a result determined by the complex singularity structure of the Bogoliubov angle. This non-perturbative finding is derived using contour integration techniques.