Braided Multisections and Symplectic Four-Manifolds with the Rational Cohomology of $S^2\times S^2$

We construct symplectic four-manifolds by taking mixed fiber sums along explicit cyclic multisections in ruled surfaces. For a connected unbranched degree-$p$ multisection in $Σ_g\times S^2$, we determine the first homology and fundamental group of the complement and prove that its boundary is incom