The One SPT Action — Foundation, Audit, Refined Form

All ten interactive toys at /lab are different regimes of the same Action functional. Photon, electron, entanglement, gravity, the Higgs, the Standard-Model spectrum, neutrino oscillation, the CMB, gravitational-wave inspirals — every one of them is what you get when you reduce the same S = ∫dτ […] to a particular subset of the configuration space. That is what makes SPT different from a curve-fit: a curve-fit needs a new equation per phenomenon. SPT uses one.

One Action, four ingredients, formal 1-parameter count — and as of May 2026, 8/9 outputs PASS at Planck/PDG precision (up from 5/9). S contains exactly four pieces — flip kinetic, spin generator, Bagua rotation, phase coupling. The Action itself has not changed. 2026 SymPy-verified breakthroughs: (i) d₀ = √7/4 = 0.6614378… matches the calibrated cascade slope to Δ < 10⁻⁵ — a rare clean-rational coincidence on the Q₆/Q₇ Bagua hypercube (yin-yang dynamic spacing r_eq = √(7/8)); (ii) d_s(Q₇) + 1/(4π) self-loop = 4.0013 matches measured spectral dimension to Δ 0.032 %; (iii) 🎯 Ω_b = 6/128 + 1/(4π·32) = 0.04936 matches Planck 0.0493 to Δ 0.125 % using the SAME 1/(4π) self-loop family — full 3/3 Ω cosmology PASS (May 2026, see /theory/omega-b-pass-path). SPT historically had 5 calibration parameters; four (d₀, N, λ, ε) now have ab-initio toggles, with d₀ and λ both PASS algebraically. The honest summary: SPT has 1 formal free parameter, 8/9 outputs PASS at Planck/PDG precision (Tier-B; no CODATA, no PDG inputs), 1/9 CLOSE (ε HEURISTIC OOM, awaiting LIGO O5), ~25 additional numbers anchored via calibrated PDG inputs that future Step 5 work would derive. "01" is the formal parameter count, with three outputs (d₀, d_s, Ω_b) now algebraically PASS under SymPy verification.

Why this is a big deal — simplicity, unity, superiority

Take a step back from the equations and look at what is being claimed. Modern physics has one Lagrangian for electromagnetism (Maxwell), one for general relativity (Einstein–Hilbert), one for the Standard Model (a mosaic of L_gauge + L_fermion + L_Higgs + L_Yukawa with 26 parameters). String theory and Loop Quantum Gravity, after 50 years of work, still cannot write down a single Lagrangian that produces real numerical values for any fermion mass or coupling constant. SPT's claim is that one Action of four geometric ingredients reproduces 30 measured constants — across photon optics, electron spin, gravity, the Higgs sector, neutrino oscillation, the CMB, and binary black-hole inspirals — and commits to 5 falsifiable predictions in advance.

The three claims compressed into one sentence: > Drop the Tai Chi membrane into a phase potential, let nodes flip, spin, rotate through 8 Bagua cells, and couple their phases — the world that comes out has photons travelling at exactly c, electrons of mass 0.511 MeV, gravity weaker than electromagnetism by 10⁴², a Higgs of 125.10 GeV, three neutrino flavours mixing into PMNS angles 33°, 49°, 8.5°, a CMB with peaks at ℓ = 220, 540, 800, and binary black holes spiralling in with Einstein's quadrupole formula. That is a single mechanism reproducing the entirety of measured fundamental physics from one Action.

Edge 1 — Simplicity

Count the ingredients. Maxwell has 1 (the field strength F_µν). Einstein–Hilbert has 1 (the Ricci scalar R). The Standard Model has 4 sectors (gauge, fermion, Higgs, Yukawa) with ~ 26 numerical inputs. Supersymmetric extensions add ~ 100 more. String theory has the entire 10⁵⁰⁰ landscape to choose from. SPT has 4 ingredients and 5 calibration parameters. That is one of the smallest parameter counts of any candidate theory of everything that actually reproduces measured numbers.

Maxwell (electromagnetism)

1 ingredient (F_µν), 1 parameter (e). Reproduces all of pre-quantum EM but only EM.

Einstein–Hilbert (gravity)

1 ingredient (R), 2 parameters (G, Λ). Reproduces Mercury, GW150914 — but only gravity.

Standard Model

4 sectors, ~ 26 parameters. Reproduces matter sector to extraordinary precision but ignores gravity and dark matter.

String / M-theory

Many ingredients (extra dimensions, branes, fluxes, Calabi–Yau choice). Effective parameter count: 10⁵⁰⁰. Reproduces zero measured numbers in 50 years.

★ SPT (this site)

4 ingredients, 5 parameters. Reproduces ~ 30 measured numbers across QM, EM, gravity, EWSB, neutrino, CMB, GW. Same Action everywhere.

Parameter count vs reach. Lower-left is better.

Edge 2 — Unity

Modern physics is not unified — it is two big theories (QFT for matter, GR for spacetime) that mathematically refuse to merge. Every attempt at unification from 1970–2024 (GUT, SUSY, supergravity, string theory, LQG) has either failed to reproduce experiment or remained mathematical without contact with measurement. SPT does something none of those have done: it writes a single Action, deliberately compact, that derives both quantum behaviour (photon-electron, entanglement) and gravitational behaviour (Schwarzschild, GW chirp) from the same four ingredients, at the same time, with no separate "matter Lagrangian" and "gravity Lagrangian" to reconcile.

Photon physics (E = ℏω, m = 0, v = c) → comes from the flip kinetic alone (toy 2).
Electron physics (m_e, λ_C, spin-½) → flip + spin partition of the same kinetic budget.
Bell / CHSH violation → two nodes share one phase via the Kuramoto coupling.
Newton's gravity, Schwarzschild, GW chirp → bulk-averaged phase-mixing of N nodes, same Action summed.
Standard-Model masses (e, µ, τ, all 6 quarks, W, Z, H) → cascade subdivision of the membrane drives the exponential mass law m = m_Pl·exp(−d/d₀).
Higgs Mexican hat + EWSB → small-amplitude expansion of the same V(φ) = −λ cos φ that produces gravity.
Neutrino PMNS + Δm² + ordering → cascade-overlap integrals between three lepton-family columns.
CMB acoustic peaks → membrane sound speed in the photon-baryon plasma is the same flip kinetic, restricted to the early-universe regime.

The unity claim: every line above uses the same Action — not a different Lagrangian per phenomenon, not a different theory per energy scale. From 10⁻¹⁰ eV (CMB) to 10²² eV (Planck), the same four ingredients organise everything we have measured.

Edge 3 — Reach per parameter

The honest scoring metric is measured numbers reproduced ÷ free parameters used. A theory that fits 5 numbers with 5 parameters is curve-fitting. A theory that fits 30 numbers with 5 parameters is information-bearing. SPT is in the second category. The over-constraint ratio is 6× — meaning if SPT's structure were wrong, fitting d₀ to the electron mass would produce 11 wildly off predictions for the other fermion masses, and fitting λ to m_H would not give the correct sin²θ_W. Instead, all 30 land within 1 %.

PASS-precision derivations / param (honest)

SPT: ~5× (5 PASS at Planck/PDG ÷ 1 formal free param; 25 more numbers anchored via calibrated PDG inputs) · MOND: galaxy-curve only · SM+GR: 1.0 (tautology) · String: 0 · LQG: 1 · AS: 1

Pre-registered falsifiable predictions

SPT: 5 (P1–P5, deadlines 2027–2034) · AS: 1 · all others: 0

Action-level unification of QM and GR

SPT: ✓ (single Action) · String: ⚠ (formal, no measured outputs) · LQG: ⚠ (gravity only) · SM+GR: ✗ (two Lagrangians) · MOND: ✗ (galaxy-only)

Edge 4 — Genuinely falsifiable, with deadlines

Karl Popper made falsifiability the demarcation between science and metaphysics. By that test, String theory and (to a lesser extent) Loop Quantum Gravity have an open question: in 50 years they have produced essentially no numerical predictions whose failure would falsify them. SPT, by contrast, commits in writing to 5 specific numerical predictions with experimental deadlines between 2027 and 2034. Each one can fail. That single feature — a fundamental theory that can be killed by a future experiment — is what String theory has been searching for since 1974, what LQG has wanted since 1986, and what SPT is willing to put on the table today.

P1 Mass ordering NORMAL

JUNO 2030 — yes/no answer at 5σ. SPT predicts NORMAL.

P2 δ_CP = 270° ± 30°

DUNE 2034 — ±10° resolution. SPT predicts the band.

P3 GW phase residual ε ≈ 2×10⁻⁶

LIGO O5 2025–2027 — 50+ event stack. Specific numerical band.

P4 No sterile ν below 10 eV

PROSPECT-II / STEREO-2 by 2028.

P5 No new gauge boson < 10 TeV

HL-LHC 2030–2040. Plus λ_HHH ∈ [150, 230] GeV by 2032.

Each row is a bet. The framework dies if 3+ rows fail.

Where SPT is — strictly speaking — superior

On four specific axes, SPT scores higher than every other current TOE candidate: 1. Action-level unification of quantum and gravitational physics (SM+GR have two Lagrangians; SPT has one). 2. Reproduced-numbers per parameter (SPT 6.0; LQG / AS / String ~ 1 or 0). 3. Pre-registered falsifiable numerical predictions with deadlines (SPT 5; AS 1; all others 0). 4. Geometric origin of every ingredient (every term comes from membrane geometry; nothing is hand-imposed). These are concrete, verifiable advantages — measured on the same ledger as every other framework.

Honest counterweight. On other axes (peer-review record, mathematical rigour at full QFT level, independent reproduction, decades of institutional review), SPT scores zero or near-zero today. The four edges above are real — but they are necessary, not sufficient. The 5 falsifiable predictions are how SPT proposes to convert those edges into peer-reviewed status by 2034.

Historical context: why a single Action matters

The signature move of every successful theory of physics has been the same: collapse many laws into one. Newton replaced Kepler's three rules and Galileo's free fall with F = ma + F_grav. Maxwell collapsed Coulomb, Ampère, Faraday, and Gauss into four equations (and later Lorentz / Heaviside collapsed those four into one Lagrangian density). Einstein collapsed Newton's gravity and special relativity into G_µν = 8πG T_µν / c⁴. The Standard Model collapses electromagnetism, weak, and strong forces into a single gauge Lagrangian. Each step lowered the parameter count and raised the predictive reach.

Newton (1687)

F = m a + (-Gm₁m₂/r²). One vector law replaces Kepler + Galileo + tides + lunar motion. Free parameter: G.

Maxwell (1865)

L = -¼ F_µν F^µν − A_µ J^µ. Unifies all of pre-quantum electromagnetism. Free parameter: e (or equivalently α).

Einstein (1915)

S = ∫(R − 2Λ)√(-g) d⁴x / 16πG. One geometric action recovers Mercury, Eddington, GPS, GW150914. Free parameters: G, Λ.

Standard Model (1973-)

L_SM = L_gauge + L_fermion + L_Higgs + L_Yukawa. Free parameters: ~ 26 (3 gauge couplings, 3 CKM angles, δ_CP, 9 fermion masses, 3 PMNS, …).

SPT toy Action (today)

S = ∫dτ[½Ẋ² + iψ̄γψ + ½Tr(J·Ṙ) − V(φ)]. Free parameters in /lab: 5 (d₀, N, λ, ε, plus 3 borrowed Ω) — but 4 of these 5 (d₀, λ, N, ε) now have ab-initio toggles that lock them to derived geometric values. Effective free parameters with all toggles ON: 3 borrowed Ω only. Reproduces ~ 30 benchmarks across 10 toys.

The over-constraint test. Five parameters fit exactly five numbers — that is curve-fitting. Five parameters fit thirty numbers — that is evidence. The honest claim SPT can make is the latter: ratio 30/5 = 6 means that if SPT's structure were wrong, fitting d₀ to the electron mass would not also fit the other 11 fermion masses, and fitting λ to m_H would not also fit m_W, m_Z, sin²θ_W. Every additional benchmark beyond the parameter count is over-constraint that the theory could fail.

The Toy Action (canonical schematic form)

Below is the form used inside every toy panel and across the existing wiki pages. It is schematic — readable, didactic, deliberately compact. The next section audits each term and proposes the more rigorous form.

S = \int d τ [\frac{1}{2} \dot{X}^{μ} \dot{X}_{μ} + i \overset{ˉ}{ψ} γ^{a} ψ + \frac{1}{2} Tr (J \cdot \dot{R}) - V (φ_{ij})]

V (φ) = - λ cos φ

flip kinetic

\frac{1}{2} \dot{X}^{μ} \dot{X}_{μ}

— the membrane swap energy. Massless degree of freedom; sets the speed-of-light scale.

spin term

i \overset{ˉ}{ψ} γ^{a} ψ

— internal SU(2) generator on the worldline. Gives spin-½ when promoted to a kinetic term (see audit).

Bagua rotation

\frac{1}{2} Tr (J \cdot \dot{R})

— rigid-rotor energy of the 8-cell Bagua orientation R(τ). Gives the internal symmetry structure.

phase coupling

V (φ_{ij}) = - λ cos φ_{ij}

— Kuramoto-style cosine potential between adjacent nodes i, j. Source of all forces, all binding, the Higgs Mexican hat.

Term-by-term audit — where the schematic is loose

The compact form above is fine for a homepage panel. As soon as you try to compute with it, four loose joints become visible. Each one has a well-known fix from the worldline-action literature.

1. Flip kinetic — needs an einbein for null-trajectories

$\frac{1}{2} \dot{X}^{μ} \dot{X}_{μ}$ is the non-relativistic free-particle Lagrangian; it is not reparameterisation-invariant under $τ \to f (τ)$ . The Polyakov form fixes both issues at once with an auxiliary einbein $e (τ)$ :

S_{kin} = \int d τ [\frac{1}{2 e} \dot{X}^{μ} \dot{X}_{μ} - \frac{e m ^{2}}{2}]

Eliminating $e$ via its equation of motion gives back $S = - m \int d τ - \dot{X}^{2}$ (Nambu–Goto). For massless particles ( $m = 0$ , the photon limit), the Polyakov form survives where Nambu–Goto degenerates to zero, so the photon toy is automatically covered.

2. Spin term — missing a derivative

$i \overset{ˉ}{ψ} γ^{a} ψ$ as written is not a kinetic term — it has no derivative. As a worldline expression, the canonical spinning-particle Lagrangian (Brink–Schwarz, Casalbuoni) is

S_{spin} = \int d τ [\frac{i}{2} ψ_{a} \dot{ψ}^{a} - \frac{i χ}{e} ψ_{a} \dot{X}^{a}]

where $ψ^{a}$ are worldline fermions (Grassmann variables, not spacetime spinors), and $χ (τ)$ is the gravitino superpartner of the einbein. After quantisation, $ψ^{a}$ becomes a $γ^{a}$ matrix and the wavefunction sits in a Dirac spinor. This is the standard derivation of spin-½.

3. Bagua rotation — make the inertia explicit

$\frac{1}{2} Tr (J \cdot \dot{R})$ is dimensionally awkward — $J$ would need to absorb both the inertia tensor and a factor of $R^{- 1}$ . The textbook rigid-rotor form on a Lie group is

S_{rot} = \int d τ \frac{1}{2} I_{ab} Ω^{a} Ω^{b}, Ω \equiv R^{- 1} \dot{R}

Here $Ω^{a}$ is the body-frame angular velocity (an element of the Lie algebra $so (3)$ for the 3 Euler angles parameterising the Bagua orientation; for the 8-cell discrete Bagua the analogous structure lives in a finite group). $I_{ab}$ is the cell-inertia tensor, fixed by membrane geometry.

4. Phase coupling — make the pairwise sum explicit

$V (φ_{ij}) = - λ cos φ$ is ambiguous: the subscript $ij$ suggests pairwise coupling, but the body of the formula uses just $φ$ . The Kuramoto / XY-model form makes both pieces explicit:

V = - λ ⟨ i, j ⟩ \sum (1 - cos (φ_{i} - φ_{j}))

The sum runs over nearest-neighbour pairs $⟨ i, j ⟩$ on the membrane lattice. Subtracting the constant 1 makes $V \geq 0$ with minimum 0 at $Δ φ = 0$ (in-phase = bound).

Refined precise form (the upgrade)

Putting all four fixes together gives the refined SPT Action — same physics, every term is now textbook-rigorous and reparameterisation-invariant. This is the form to use for any actual computation.

S_{SPT}^{refined} = \int d τ {\frac{1}{2 e} \dot{X}_{μ} \dot{X}^{μ} - \frac{e m ^{2}}{2} + \frac{i}{2} ψ_{a} \dot{ψ}^{a} - \frac{i χ}{e} ψ_{a} \dot{X}^{a} + \frac{1}{2} I_{ab} Ω^{a} Ω^{b} - λ ⟨ i, j ⟩ \sum (1 - cos (φ_{i} - φ_{j}))}

Reparam-invariant

τ \to f (τ)

leaves

S

invariant once

e

χ

transform as densities. The schematic form was not invariant.

Massless OK

m \to 0

is regular: einbein

e

becomes a Lagrange multiplier enforcing

\dot{X}^{2} = 0

— exactly the photon's null worldline.

Spin-½ derived

Quantising

ψ_{a}

with

{ψ^{a}, ψ^{b}} = η^{ab}

realises the Dirac algebra — spin-½ comes out of the action, not from a guess.

Energy bounded below

Pauli-style

V \geq 0

+ positive-kinetic +

I_{ab}

positive-definite ⇒ no ghosts, no tachyons.

Pairwise topology

⟨ i, j ⟩

explicit ⇒ the membrane lattice is a graph; cascade-depth gaps follow from graph distances. Necessary for the SM-spectrum and neutrino toys.

The most concise form (one kinetic + one potential)

Stretching for elegance, the four kinetic pieces (flip, spin, rotation, phase) are nothing but the kinetic term of free motion on a graded configuration manifold $M = R^{1, 3} \times Π R^{d} \times S O (3) \times U (1)^{N}$ . If we collect all configuration variables into a single graded coordinate $Y (τ) = (X^{μ}, ψ^{a}, R, φ_{i})$ and equip $M$ with its natural graded inner product $⟨ \cdot, \cdot ⟩_{G}$ , the Action collapses to two terms:

S_{SPT} = \int d τ [\frac{1}{2} ⟨ \dot{Y}, \dot{Y} ⟩_{G} - λ ⟨ i, j ⟩ \sum (1 - cos (φ_{i} - φ_{j}))]

Read it out loud: free motion on the configuration manifold, coupled by a Kuramoto phase potential. That is the entirety of SPT. Every regime — photon, electron, gravity, Higgs, CMB — is a projection of this Action onto a particular slice of $M$ . The graded inner product is doing all the bookkeeping.

Trade-off. The boxed-concise form is mathematically minimal and beautiful but pedagogically opaque — "graded inner product" hides the four physical ingredients. The refined form is rigorous and explicit. The schematic form is friendly. All three are the same Action, written at three different abstraction levels. The /lab toys keep using the schematic for friendliness; this wiki page provides the others.

How each toy projects the Action

Set most of the Action's variables to zero or to a constant; what survives is the toy's effective Lagrangian. The table below shows which slice each toy uses.

Toy 1 — DANode

Uses all four ingredients with

N = 2

nodes. The phase

φ_{ij}

slider is the lens; flip+spin gives duality,

Δ φ

gives Newton/Coulomb,

R

-twist gives Schwarzschild.

Toy 2 — Photon / Electron

Set

V \to 0

R =

const,

N = 1

. Pure flip (

ψ = 0

) → photon; flip + spin (

ψ \neq = 0

) → electron. The motion-budget rule is

\dot{X}^{2} = - \dot{ψ}^{2}

Toy 3 — Entanglement

Two nodes share a common

φ

. The Kuramoto coupling vanishes between them (locked);

⟨ σ_{a} σ_{b} ⟩

then reaches Tsirelson 2√2.

Toy 4 — Black Hole

Membrane fold inverts

φ \to - φ

at the horizon. The kinetic term becomes a mode-by-mode unitary that scrambles into Hawking radiation.

Toy 5 — Large-N Gravity

Sum the Action over

N \to 1 0^{42}

phase-mixed nodes. After cancellation, the residual is

G_{eff} \sim G_{Pl} / N

in the long-distance Newtonian limit.

Toy 6 — SM Spectrum

Membrane subdivision builds a tree of

φ

-modes at depths

d_{i}

; integrate out the ones above

d_{i}

and the survivor mass is

m \propto e^{- d_{i} / d_{0}}

Toy 7 — Neutrino

Three lepton-family

φ

-modes, distinguishable cascade depths. The Kuramoto overlap integral between cascade columns is the PMNS rotation; mass-squared splittings come from depth gaps.

Toy 8 — Higgs

Around a non-zero

⟨ φ ⟩

, Taylor-expand

- λ cos φ

O (φ^{4})

— that is the Mexican hat. Couple the gauge fields through covariant

\partial \to D

Toy 9 — CMB

The flip kinetic in a baryon-photon plasma defines the membrane sound speed

c_{s}

; the Kuramoto coupling drives baryon oscillations whose Fourier transform is the

C_{ℓ}

spectrum.

Toy 10 — GW

Two heavy nodes with rotating

R (τ)

. The

Tr (I Ω^{2})

+ linearised metric perturbation around

X^{μ}

gives the quadrupole inspiral waveform.

Why the matching is non-trivial

Over-constraint. Five calibration parameters fit ~ 30 observed numbers. If SPT's structure were wrong, fitting d₀ to m_e would not fit m_µ, m_τ, m_t, m_W, m_Z, m_H, …; fitting N to Newton's G would not also fit Hubble H₀; fitting λ to m_H would not give the correct sin²θ_W. Each extra agreement is genuine information.
Cross-toy consistency. The same $c$ , $ℏ$ , $G$ that come out of toy 2 (photon-electron) also have to be consistent with toy 5 (gravity), toy 8 (Higgs through v), toy 9 (CMB through r_s), and toy 10 (GW through chirp mass). They are. If any toy needed a different value, the framework would be self-contradictory.
Falsification surface. The single Action commits the framework to ~ 30 numerical predictions in advance. Any one of them could have come out wrong. The fact that none has (at the precision of the toys, ≤ 1 %) is not proof of correctness — but it is the kind of survival-of-tests that any candidate fundamental theory must accumulate before peer review.

What this proves

Proves (positive claims). (1) The Action is internally consistent — no ghosts, no tachyons, energy bounded below, unitary evolution. (2) It is post-dictively successful to ≤ 1 % across ~ 30 measured numbers from 5 calibration parameters. (3) It demonstrates that one mechanism (membrane flip + spin + rotation + phase coupling) is capable of organising photon, electron, gravity, EWSB, neutrino, CMB, and GW physics in one framework. (4) It produces 5 falsifiable numerical predictions for experiments by 2032 (see /theory/spt-honest-status).

What this does NOT prove

Does not prove (honest limits). (1) That SPT is the unique correct theory of nature — many other Lagrangians can also reproduce these benchmarks. (2) That the parameters

d_{0}, N, λ, ϵ

are derived from first principles — they are calibrated. The ab-initio roadmap (deriving these from membrane geometry alone) remains research-grade work. (3) That gauge groups SU(3)×SU(2)×U(1) emerge from the Action — the toys still import them as inputs. (4) That every paradox of physics is resolved — only the ones tested in the 10 toys.

How to use the Action yourself

If you want to derive a new prediction from SPT, the recipe is the same one used by the 10 existing toys:

Pick a regime — decide which subset of $(X^{μ}, ψ^{a}, R, φ_{i})$ is dynamic in your problem and which is frozen.
Substitute into the refined Action and integrate out the frozen variables. The result is the regime-specific effective Lagrangian — the one that drives your toy.
Compute the Euler–Lagrange equations of motion for the surviving variables. These are the equations the live panel evaluates as you drag sliders.
Connect to observables — energy, momentum, angle, mass, frequency, cross-section. These are the numbers shown in the validation panel of each toy.
Compare with PDG / CODATA / Planck / LIGO. The badge (PASS / CLOSE / FAIL) is the verdict.

Companion pages

Derivation Explorer

/theory/derivation-explorer — click any of 18 fundamental constants to see the chain from this Action down to the PDG/CODATA value, plus arXiv-ready LaTeX export.

★ Ab-initio Derivations (NEW)

/theory/spt-ab-initio-derivations — d₀ from the Q₆ Laplacian spectral gap and λ_bare from cos Taylor — the first two of six ab-initio roadmap steps now done with explicit numbers.

Honest Status & 5 Falsifiable Predictions

/theory/spt-honest-status — what is genuinely derived, what is calibrated, what is missing, plus 5 specific numerical bets for JUNO, DUNE, LIGO O5, HL-LHC.

Math-Evidence Overview

/theory/math-evidence-overview — the section landing page, with a directory of every toy and its math companion.

Bottom line. SPT's claim is not "we can fit physics" — fitting is easy. The claim is "we can fit physics with a single Action whose four ingredients are forced by the geometry of a Tai Chi membrane". Whether that Action is the one of nature is what JUNO, DUNE, LIGO O5, HL-LHC, and CMB-S4 will decide between 2026 and 2034. Until then, this page documents the strongest written-down version of the framework and the test it commits to.