The bundle Laplacian on discrete tori
Fabien Friedli
Source abstract
We prove an asymptotic formula for the determinant of the bundle Laplacian on discrete d -dimensional tori as the number of vertices tends to infinity. This determinant has a combinatorial interpretation in terms of cycle-rooted spanning forests. We also establish a relation (in the limit) between the spectral zeta function of a line bundle over a discrete torus, the spectral zeta function of the infinite graph \mathbb Z^d and the Epstein–Hurwitz zeta function. The latter can be viewed as the spectral zeta function of the twisted continuous torus which is the limit of the sequence of discrete tori.
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