OpenAI · 215-04 · 2026-09-23 · Probability and statistical mechanics

Sharp mass bounds for the two-dimensional O(4) model

preprints/Sharp-mass-bounds-for-the-two-dimensional-O4-model-September-23-2026

Family 215. Massive continuum limits and exact mass asymptotics for planar $O (n)$ models.

The authors are OpenAI. This companion does not verify the proof and does not adopt it as a theorem of Ngo Cheung’s series. It is not a premise. O.1 stays NOT_CLOSED. Anti-de Sitter results are not a de Sitter state, not Em02-E’s relational lapse, not XVI-P’s QdS scheme, and not XVI-Q’s sigma-image record. No quantum coefficient is admitted. No compilation is asserted.

Read against the standing problems

Standing problems. No standing problem is named in this text. It was still read against the nine problems and does not close any of them. The authors are OpenAI. The companion does not verify the proof. This is not a premise of a manuscript by Ngo Cheung. O.1 stays NOT_CLOSED. No quantum coefficient is admitted. No compilation is asserted. XVI-P · XVI-N

Constructs the canonical continuum limit of the two-dimensional nearest-neighbor $O (3)$ model: a non-Gaussian local relativistic theory with a unique vacuum and a positive mass gap. For the square-lattice $O (4)$ model, determines the exact leading asymptotic of the full transfer gap, $m_{lat} (β) \sim 32 e^{π /4 - 1/2} β e^{- π β}$ . The family also proves exponential spin-correlation decay for two-dimensional nearest-neighbor $O (n)$ models with $n \geq 3$ at every positive temperature.

We prove sharp mass bounds for the two-dimensional nearest-neighbor $O (4)$ model. For all sufficiently large inverse couplings β, the full transfer gap, including rotation-invariant local-observable sectors, is bounded above and below by positive multiples of $β e^{- π β}$ . We also prove that the model has a unique periodic local limit and a positive full gap at every finite β > 0, resolving the all-temperature lattice mass-generation conjecture for this periodic state. Under the stated cutoff scaling, the mass bounds are uniform in independently fixed physical units. A continuum spectral interpretation requires separate convergence hypotheses for the transfer semigroup and the block observables.

Preprint source and Lean scope

The abstract above is the catalogue abstract. The sections below are the full preprint source, 0 sections. This page is not only the abstract. The manuscript file is loading.

A Lean scope note is stored for family 215, but it does not name this preprint. It names 215-05. This page still has the full preprint source. No compilation is asserted. O.1 stays NOT_CLOSED.