English

Varsovian models II

Logic 2025-05-14 v2

Abstract

Assume the existence of sufficent large cardinals. Let MswnM_{\mathrm{sw}n} be the minimal iterable proper class L[E]L[E] model satisfying "there are δ0<κ0<<δn1<κn1\delta_0<\kappa_0<\ldots<\delta_{n-1}<\kappa_{n-1} such that the δi\delta_i are Woodin cardinals and the κi\kappa_i are strong cardinals". Let M=Msw2M=M_{\mathrm{sw}2}. We identify an inner model V2M\mathscr{V}_2^M of MM, which is a proper class model satisfying "there are 2 Woodin cardinals", and is iterable both in VV and in MM, and closed under its own iteration strategy. The construction also yields significant information about the extent to which MM knows its own iteration strategy. We characterize the universe of V2M\mathscr{V}_2^M as the mantle and the least ground of MM, and as HODM[G]\mathrm{HOD}^{M[G]} for GColl(ω,λ)G\subseteq\mathrm{Coll}(\omega,\lambda) being MM-generic with λ\lambda sufficiently large. These results correspond to facts already known for Msw1M_{\mathrm{sw}1}, and the proofs are an elaboration of those, but there are substantial new issues and new methods used to handle them.

Cite

@article{arxiv.2110.12051,
  title  = {Varsovian models II},
  author = {Grigor Sargsyan and Ralf Schindler and Farmer Schlutzenberg},
  journal= {arXiv preprint arXiv:2110.12051},
  year   = {2025}
}

Comments

110 pages. Corrected acknowledgements, corrected/updated references and affiliation of 3rd author

R2 v1 2026-06-24T07:07:09.737Z