On the Intermediate Models of Strongly Compact Prikry Forcing

Abstract

We analyze the intermediate models of the strongly compact Prikry forcing. We exhibit a simple combinatorial property which, for a given supercompact cardinal $κ$, characterize the projections of all projections of the strongly compact Prikry forcing using $κ$-complete fine measures. Considering level-by-level results, if $κ$ is $2^λ$-strongly compact, we characterize the forcings of size $\leqλ$ which are projections of that $λ$-strongly compact Prikry forcing. Our characterization generalizes several known results, including those of Benhamou-Hayut-Gitik and folklore results regarding the class of $κ$-distributive forcing notions which are embedded into the supercompact Prikry forcing. Fixing a $κ$-complete fine measure $\mathcal{U}$ on $P_κ(λ)$, we also provide Rudin-Keisler like critiria for the existence projections from the strongly compact Prikry forcing with $\mathcal{U}$. Finally, we prove that among all projections of the $λ$-strongly compact Prikry forcing, the class of forcings of cardinality $λ$ are exactly those for which there is a projection map which depends only on the stem of the Prikry condition. We also give partial results regarding projections of arbitrary cardinality.