On spt-crank type functions

Abstract: In a paper, Andrews, Dixit, and Yee introduced a new spt-type function $\operatorname{spt}\omega(n)$, which is closely related to Ramanujan's third order mock theta function $\omega(q)$. Garvan and Jennings-Shaffer introduce a crank function which explains congruences for $\operatorname{spt}\omega(n)$. In this note, we study asymptotic behavior of this crank function and confirm a positivity conjecture of the crank asymptotically. We also study a sign pattern of the crank and congruences for $\operatorname{spt}_\omega(n)$.