Morse theory and Lescops equivariant propagator for 3-manifolds with $b_1=1$ fibered over $S^1$

For a 3-manifold $M$ with $b_1(M)=1$ fibered over $S^1$ and the fiberwise gradient $xi$ of a fiberwise Morse function on $M$, we introduce the notion of amidakuji-like path (AL-path) on $M$. An AL-path is a piecewise smooth path on $M$ consisting of edges each of which is either a part of a critical locus of $xi$ or a flow line of $-xi$. Counting closed AL-paths with signs gives the Lefschetz zeta function of $M$. The moduli space of AL-paths on $M$ gives explicitly Lescops equivariant propagator, which can be used to define $mathbb{Z}$-equivariant version of Chern--Simons perturbation theory for $M$.