Volume 27 · Back matter

Breaking Evidence

New results that could move the volume's weaknesses.

The volume's weak-points page names the gaps. This page names the evidence that might close them. Most entries will start as watching and only move to promising once the citation, replication, and relevance are clear.

2026-08-21 · Peters et al., Nature Communications / Loughborough University

Confirmed

Millimetre-wave comb generated by an optical microcomb

A rice-sized chip-based microresonator coupled to a larger optical-fiber loop produces a stable, self-starting microcomb whose evenly spaced optical lines are converted into multiple precisely spaced millimetre-wave signals at once. Individual comb lines can be amplified or suppressed, and the comb's precision and stability carry through to the millimetre-wave output — it holds while people jump next to the bench.

Touches

Chapter 20 · engineered surplus · precision timing

What would change

Supplies Chapter 20 with a manufactured instance of the profligacy the chapter tracks: spectral surplus whose spacing and amplitudes are chosen rather than inherited. It changes no claim about gravity, curvature, or emergent geometry.

What still needs checking

Comb linewidth and phase-noise figures against atomic-clock references; how much of the demonstrated stability survives outside the tabletop setup; and whether the shoebox-scale, satellite, and 6G applications named in the coverage reach a working device.

2026-08-21 · matharium / X

Confirmed

Flow around a wing 'never filmed, only solved'

A computational fluid dynamics integration of the Navier-Stokes equations around a wing, producing pressure fields, lift, and trailing-edge vortices in slow motion. The post frames the result as something that was not photographed but computed: the flow was 'solved' rather than filmed.

Touches

Chapter 4 · visualisation as proxy · Navier-Stokes status

What would change

Reinforces Chapter 4's central point that a rendered flow field is a picture of a solution, not a photograph of the thing. It gives the chapter a concrete, widely accessible example of the 'solved but never filmed' distinction and the proxy status of beautiful visualisations.

What still needs checking

Whether the specific simulation is an original computation or a reproduction of a published case; the Reynolds number, turbulence model, and boundary conditions used; and whether the phrase 'never filmed' is strictly true (smoke-tunnel and PIV wing visualisations exist) or a rhetorical contrast between direct optical observation and numerical solution.

2026-08-22 · Mathelirium / X

Confirmed

Photonic-crystal waveguide bend

A demonstration of an electromagnetic wave negotiating a sharp 90-degree turn inside a photonic crystal. The repeating dielectric lattice opens a frequency range in which bulk propagation is suppressed; removing a line of scatterers creates a defect waveguide that confines and steers the field along the allowed path.

Touches

Chapter 3 · eigenvalues interleaf · metamaterial anchors

What would change

Reinforces the anchor status of photonic and optical metamaterials in Chapter 3's analogue table. It does not move the gravitational claim, but it supplies a clean, visual example of band-structure engineering producing geometric function inside its proper validity band.

What still needs checking

Whether the demonstration is an original simulation or a reproduction of a published geometry; the lattice parameters, refractive-index contrast, and frequency regime; and whether the source can point to a peer-reviewed reference for this specific bend structure.

2026-08-04 · Berkeley Lab / Nature

Watching

Hidden structure of a quantum fluid: a tunable exciton condensate

Feng Wang's group at Berkeley Lab and UC Berkeley (Nature, s41586-026-10636-y) observed a tunable Bose-Einstein condensate of excitons — bound electron-hole pairs — in a MoSe2/WSe2 bilayer separated by hexagonal boron nitride. The excitons sit in the ground state rather than a light-pumped excited state, so they reach equilibrium and persist as a genuine quantum fluid, with signatures surviving up to about 2 Kelvin. The condensate is not one-flavor: it carries two components with distinct spin-valley structure, and a small magnetic field switches the same fluid between different quantum phases. Density is tuned electrically; the internal order is read out by magneto-optical spectroscopy.

Touches

Chapter 3 · Chapter 16 · Chapter 17 · gravitational metamaterials

What would change

This is an analogue result in a solid-state medium, not a gravitational anchor, so Finding 01 stands. What it strengthens is the fluid/wave picture the volume already uses: a laboratory quantum fluid, made of light-coupled matter, whose internal structure is discrete, multi-component, and switched by a single continuous magnetic parameter. That is the same arrangement — continuous control, discrete structural outcome — logged in Relay #132 and the essay 'The Butterfly and the Critical Line', now demonstrated in an equilibrium condensate rather than a spectral diagram. It is filed as a proxy that makes the analogy less decorative: a real system where a magnetic dial selects among internal phases of a coherent fluid.

What still needs checking

Whether the magnetic switching is continuous or threshold-like as the field varies; whether the two-component structure exhibits any collective mode or vorticity that a wave-and-collapse reading would predict and standard condensate theory would not; and whether independent groups reproduce the phase switching. No gravitational claim is attached to this result.

How to add an entry

New evidence is logged in src/lib/geometry-breaking-evidence.ts. An entry needs a source, a one-sentence summary, the chapters or findings it touches, a status, and a statement of what would have to change. Until the citation is solid, leave the status as watching.