Unimodality of Eulerian quasisymmetric functions

We prove two conjectures of Shareshian and Wachs about Eulerian quasisymmetric functions and polynomials. The first states that the cycle type Eulerian quasisymmetric function $Q_{λ,j}$ is Schur-positive, and moreover that the sequence $Q_{λ,j}$ as $j$ varies is Schur-unimodal. The second conjecture, which we prove using the first, states that the cycle type $(q,p)$-Eulerian polynomial \newline $A_λ^{\maj,\des,\exc}(q,p,q^{-1}t)$ is $t$-unimodal.

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