Covering with Chang models

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Assume NLE{\sf{NLE}} and suppose there are unboundedly many Woodin cardinals and strong cardinals. Let κ\kappa be a limit of Woodin cardinals and strong cardinals such that either κ\kappa is a measurable cardinal or cf⁡(κ)=ω\operatorname{cf}(\kappa)=\omega. Covering with Chang Models. There is a transitive model MM of ZFC−Powerset{\sf{ZFC-Powerset}} such that

Ord⁡∩M=κ+,\operatorname{Ord}\cap M=\kappa^+,

MM has a largest cardinal ν\nu, and for any g⊆Coll⁡(ω,<κ)g\subseteq\operatorname{Coll}(\omega,<\kappa), defining

R∗=⋃α<κRV[g∩Coll⁡(ω,α)]\mathbb{R}^*=\bigcup_{\alpha<\kappa}\mathbb{R}^{V[g\cap\operatorname{Coll}(\omega,\alpha)]}

and

Γ∗={Ag∩R∗:∃α<κ (A∈Γg∩Coll⁡(ω,α)∞)},\Gamma^*=\{A^g\cap\mathbb{R}^*: \exists\alpha<\kappa\,(A\in\Gamma^\infty_{g\cap\operatorname{Coll}(\omega,\alpha)})\},

then, in V(R∗)V(\mathbb{R}^*),

L(M,⋃α<ναω,Γ∗,R∗)⊨AD.L\left(M,\bigcup_{\alpha<\nu}\alpha^\omega,\Gamma^*,\mathbb{R}^*\right)\vDash{\sf{AD}}.

If in addition there is no inner model with a subcompact cardinal, then

L(M)⊨ZFC+℘(ν)=℘(ν)M+□ν.L(M)\vDash {\sf{ZFC}}+\wp(\nu)=\wp(\nu)^M+\square_\nu.

The result gives a covering model with Chang-model-like structural properties from strong large-cardinal hypotheses, while also producing a model of determinacy after the indicated collapse. The supplied text does not state whether this result is intended as a conjecture, theorem, or open problem, so its database status remains open.

References

Primary source

Grigor Sargsyan, “Covering with Chang models over derived models”, arXiv:2110.06031 (2021).

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