Exponential Networks
摘要
Exponential networks were introduced in Eager et al. (JHEP 08:063, 2017) by Eager, Selmani, and Walcher as a tool to study (framed) BPS B-branes on toric affine Calabi–Yau threefolds X, extending both the construction of spectral networks in 4d \(\mathcal N=2\) gauge theories and the geometric approach to BPS states pioneered in Klemm et al. (Nucl Phys B 477:746–766, 1996). By mirror symmetry, BPS B-branes on X, i.e. coherent sheaves on X, correspond to special Lagrangian submanifolds in the mirror Y of X. In the framework of local mirror symmetry, this correspondence reduces further to the study of calibrated Lagrangian cycles in the mirror curve \(\Sigma \subset (\mathbb {C}^*)^2\) of X. Upon choosing a projection \(\pi \colon \Sigma \to \mathbb {C}^*\) , one then studies saddle trajectories on \(\mathbb {C}^*\) , arising as the images under \(\pi \) of calibrated cycles in \(\Sigma \) . It is precisely in this setting that exponential networks emerge.