2408.17444
INSTANTANEOUS HAMILTONIAN DISPLACEABILITY AND ARBITRARY SYMPLECTIC SQUEEZABILITY FOR CRITICALLY NEGLIGIBLE SETS
Yann Guggisberg, Fabian Ziltener
correctmedium confidence
- Category
- Not specified
- Journal tier
- Strong Field
- Processed
- Sep 28, 2025, 12:56 AM
- arXiv Links
- Abstract ↗PDF ↗
Audit review
The paper proves Theorem 6 and Theorem 14 rigorously via a product–measure lemma (Lemmas 22–23) and a careful Fubini-in-polar-coordinates argument (Lemma 21), yielding a linear Hamiltonian translation that disjoins A from B for almost every time; see the precise statement and proof sketch of Theorem 6 and Lemma 21 in the main text . The squeezing result (Theorem 14) is then obtained by an explicit folding construction formalized in Lemma 26 and iterated across factors, not by global capacity or packing arguments . By contrast, the candidate’s Phase (2) asserts key steps that are unproven or false as stated (e.g., covering by finitely many Lipschitz pieces with arbitrarily small n-content; asserting arbitrarily small Gromov width for thickened neighborhoods; and invoking Schlenk folding to push a polydisk containing the neighborhood into an arbitrarily small ball without quantitative conditions). Hence the model’s (2) is incomplete/incorrect, although its (1) aligns with the paper’s method.
Referee report (LaTeX)
\textbf{Recommendation:} minor revisions \textbf{Journal Tier:} strong field \textbf{Justification:} The manuscript settles sharp displaceability and squeezing thresholds for rectifiable, critically negligible sets, integrating GMT tools with Hamiltonian dynamics and an inventive folding scheme. The presentation is clear and the ideas are well-motivated. Minor improvements in exposition (highlighting lemma dependencies and iteration structure) would polish an already solid paper.