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HOD in inner models with Woodin cardinals

Research paper by Sandra Müller, Grigor Sargsyan

Indexed on: 21 Apr '20Published on: 20 Apr '20Published in: arXiv - Mathematics - Logic



Abstract

We analyze the hereditarily ordinal definable sets $\operatorname{HOD}$ in $M_n(x)[g]$ for a Turing cone of reals $x$, where $M_n(x)$ is the canonical inner model with $n$ Woodin cardinals build over $x$ and $g$ is generic over $M_n(x)$ for the L\'evy collapse up to its bottom inaccessible cardinal. We prove that assuming $\boldsymbol\Pi^1_{n+2}$-determinacy, for a Turing cone of reals $x$, $\operatorname{HOD}^{M_n(x)[g]} = M_n(\mathcal{M}_{\infty} | \kappa_\infty, \Lambda),$ where $\mathcal{M}_\infty$ is a direct limit of iterates of $M_{n+1}$, $\delta_\infty$ is the least Woodin cardinal in $\mathcal{M}_\infty$, $\kappa_\infty$ is the least inaccessible cardinal in $\mathcal{M}_\infty$ above $\delta_\infty$, and $\Lambda$ is a partial iteration strategy for $\mathcal{M}_{\infty}$. It will also be shown that under the same hypothesis $\operatorname{HOD}^{M_n(x)[g]}$ satisfies $\operatorname{GCH}$.