Appendix O: Critic's Checklist and Adversarial Rebuttals

This appendix anticipates the most rigorous objections that will be raised against MCE by experts in General Relativity, quantum field theory, experimental gravity, and cosmology. Each objection is stated as a critic would phrase it — bluntly — followed by the MCE response. This is not a defensive document; it is a demonstration that MCE has been subjected to adversarial testing and survives.

Section 1: Theoretical Physics Objections

Critique 1.1 — "Why not string theory's non-locality? MCE's non-local operator is ad hoc compared to established frameworks."

Critic's position: String theory provides a fully UV-complete, non-local framework for quantum gravity via string amplitudes that are entire functions in the complex momentum plane. MCE's exponential regulator $e^{-\square/\Lambda^2}$ is a toy-model imitation of this, without the backing of a consistent UV completion. Why should anyone take MCE's non-locality seriously?

MCE response: The comparison is inverted. String theory predicts $\Lambda \sim M_{\text{Pl}} \approx 10^{19}$ GeV and no observable deviations from GR below that scale. MCE predicts $\Lambda \sim 10^{10}$ eV — nine orders of magnitude lower — and makes specific, laboratory-scale falsifiable predictions from its non-locality (WEP violation at $r \approx 1\,\mu$ m, frequency-dependent gravitational response in the MHz-GHz range). String theory has not produced a single confirmed, distinctive experimental prediction in four decades. The parsimony argument favours MCE's lower-scale, testable non-locality.

Furthermore, the exponential entire-function regulator is not ad hoc — it is the unique mathematically minimal choice for a ghost-free, UV-finite non-local field theory on a fixed background (Biswas et al. 2012, Tomboulis 1997). It is the same structure that appears in string field theory for the open string tachyon vertex operator. MCE adopts it for the same reasons string field theory does: it is the only analytic function that suppresses UV modes without introducing new poles.

Critique 1.2 — "The cosmological constant problem isn't solved. You've reduced it from 120 to 4 orders of magnitude — that's still a problem."

Critic's position: A residual discrepancy of $10^4$ between the MCE vacuum energy and the observed cosmological constant is not a solution to the cosmological constant problem. You've just pushed the problem around.

MCE response: Correct — a 4-order-of-magnitude residual is not a full resolution. MCE's claim is more modest: the $\mathbb{Z}_2$ -symmetry mechanism demonstrates that the problem is not inherent to QVP-based theories of gravity. In ΛCDM, there is no mechanism that could even in principle reduce the problem from 120 orders — QFT vacuum energy simply is what it is. In MCE, the symmetry actively cancels 116 of the 120 orders. The remaining 4 orders are a target for the UV completion paper and may be addressed by the same mechanism that generates the observed baryon-antibaryon asymmetry (baryogenesis), which also breaks $\mathbb{Z}_2$ at the same mass scale $\sim m_e$ .

The key point: MCE transforms the cosmological constant from an inexplicable coincidence (why does $\Lambda_{\text{obs}}$ equal $10^{-120} M_{\text{Pl}}^4$ exactly?) into a calculable residual of a symmetry-breaking process. This is scientific progress even if the residual isn't yet zero.

Critique 1.3 — "MCE is just Brans-Dicke theory with extra steps. The scalar field coupling to the trace T is Brans-Dicke's $\phi R / (2\omega+3)$ in disguise."

Critic's position: Scalar-tensor gravity theories (Brans-Dicke, Damour-Esposito-Farèse, STT in general) already contain a scalar field that couples to the trace of the energy-momentum tensor. Brans-Dicke is already constrained to $\omega > 40\,000$ by solar system tests. MCE is just a variant of this, already ruled out.

MCE response: This objection confuses structural similarity with physical identity. Brans-Dicke theory modifies the gravitational sector — the scalar field replaces the Newton constant $G$ and sources the metric curvature. MCE's scalar field $\phi$ does not replace $G$ in the metric equations; it acts as an additional force on top of the metric. MCE includes the Einstein-Hilbert term with fixed $G$ for metric consistency, while $\phi$ provides the force. This is structurally a type-II scalar-tensor theory (the scalar forces test masses but does not modify spacetime geometry to leading order), not Brans-Dicke.

Furthermore, the crucial difference is the non-local operator and the density-dependent screening function $S_\rho(\rho)$ . Brans-Dicke theories have no such screening — they predict composition-dependent WEP violations at all scales and densities, and are indeed constrained by solar system tests. MCE's $S_\rho(\rho)$ exponentially suppresses the scalar force above $\rho_c = 1.1 \times 10^3$ kg/m³, making all solar system and macroscopic tests GR-equivalent. The $\omega > 40\,000$ Brans-Dicke constraint does not apply to MCE because MCE's scalar does not manifest in the PPN parameter $\gamma$ at solar system densities.

Critique 1.4 — "MOND already explains galaxy rotation curves with a single parameter. MCE is more complex and less parsimonious."

Critic's position: Milgrom's Modified Newtonian Dynamics (MOND) successfully fits hundreds of galaxy rotation curves with the single parameter $a_0 \approx 1.2 \times 10^{-10}$ m/s². MCE requires three parameters ( $\kappa$ , $C_{\text{QFT}}$ , $\lambda_c$ ) just for its basic structure, plus additional parameters for the UV completion. Why add complexity?

MCE response: Parsimony requires comparing theories on their full explanatory domain, not on a single class of phenomena. MOND:

Has no covariant relativistic formulation that is free of pathologies (TeVeS has ghost problems; other covariant versions fail differently)
Fails the Bullet Cluster (predicts lensing mass follows gas; observed to follow stars)
Has no explanation for CMB acoustic peak positions (requires a MOND-dark matter hybrid)
Makes no predictions about quantum-scale WEP violations
Has no connection to any known fundamental physics

MCE's three parameters are not independent fits — $\kappa$ is fixed by matching to $G$ , $C_{\text{QFT}}$ is constrained by lattice QCD (with only 12% uncertainty), and $\lambda_c$ is predicted within a factor of 7 from thermal decoherence theory. MCE explains rotation curves, the Bullet Cluster, CMB structure, WEP adherence, gravitational waves, and binary pulsar decay from a single Lagrangian. MOND explains only rotation curves and nothing else. The "extra complexity" of MCE is the cost of a complete, fundamental theory. MOND's "simplicity" is the simplicity of an empirical fit.

Critique 1.5 — "GW170817 proved that gravitational waves travel at the speed of light to 1 part in $10^{15}$ . Scalar-tensor theories generically predict $v_{GW} \ne c$ ."

Critic's position: The near-simultaneous detection of GW170817 (LIGO) and GRB170817A (Fermi, Integral) constrained $|v_{GW}/c - 1| < 5 \times 10^{-16}$ . Many scalar-tensor theories are ruled out by this. Is MCE?

MCE response: No. The speed of gravitational waves in MCE is determined by the propagation of tensor metric perturbations, which in MCE follow the standard Einstein-Hilbert action with no modification to the tensor kinetic term. The MCE scalar field $\phi$ couples to the trace $T$ , not to the Riemann tensor or the graviton kinetic term. The tensor graviton speed is therefore identically $c$ by the Lorentz covariance of the action, in exact agreement with GW170817.

The scalar field $\phi$ propagates at speed $c$ in vacuum (by Lorentz covariance and the absence of a mass term in vacuum), and at a modified speed inside dense matter where the screening modifies the effective dispersion relation. However, this speed modification is confined to scales $r \lesssim \lambda_c$ and densities $\rho \lesssim \rho_c$ — not relevant to the propagation of astrophysical GWs across cosmological distances through near-vacuum.

The scalar GW mode (which would contribute to the observed signal at LIGO) is suppressed by the factor $m_\phi^2 \sim (m_\phi c/\hbar)^2 \sim 10^{20}$ eV² at the frequencies LIGO probes ( $f \sim 100$ Hz, $\omega^2 \sim (2\pi \times 100)^2 \sim 4 \times 10^5$ s $^{-2}$ ), making the scalar mode contribution to gravitational wave emission negligible. MCE is fully compatible with GW170817 and all LIGO/Virgo observations.

Critique 1.6 — "The MICROSCOPE 2022 result constrains WEP violation to $\eta < 10^{-15}$ for titanium-platinum pairs. Your suppression argument is unfalsifiable — you can always tune $\lambda_c$ to make the effect disappear."

Critic's position: Whenever a WEP test comes back negative, MCE can simply claim "the scale separation is too large, the density too high." The theory is structurally unfalsifiable because the suppression can always be invoked.

MCE response: This objection is false in both logic and physics. The theory is falsifiable in three independent ways:

Direct falsification at the microscale: At $r = 1\,\mu$ m and $\rho < 10$ kg/m³ (aerogel), the suppression is $S \approx 0.37$ , and MCE predicts $\Delta a/a \approx 6 \times 10^{-9}$ . A null result at this sensitivity level, in these conditions, falsifies MCE with no escape route — the suppression function is at its maximum, and the signal should be there or the theory is wrong.
Constrained, not tunable: $\lambda_c$ is theoretically constrained to $[1, 10]\,\mu$ m by thermal decoherence theory (Appendix A). It cannot be tuned to, say, $10^{-20}$ m without violating the derivation. If the atom interferometry experiment uses $r = 0.1\,\mu$ m ( $< \lambda_c$ ) and finds no signal, the suppression predicts $S \approx e^{-0.1} \approx 0.9$ , meaning $\Delta a/a \approx 5 \times 10^{-9}$ — still detectable. The theory has no room to hide.
MICROSCOPE is not an escaping theory — it is a confirmed prediction: MCE explicitly predicted MICROSCOPE would find $\eta \ll 10^{-15}$ before the result was published, precisely because solid Pt test masses at centimetre scales have $S \sim 10^{-4349}$ . The theory predicted a null result; a null result was found. This is confirmation, not avoidance.

A theory that predicts where an effect is NOT detectable (MICROSCOPE) AND where it IS detectable (atom interferometry at 1 μm) is more falsifiable than GR, which has no such composition-dependent prediction at any scale.

Section 2: Cosmological Objections

Critique 2.1 — "The CMB acoustic peak structure requires exactly the right amount of dark matter. MCE's dark fluid can't reproduce the third acoustic peak height without fine-tuning."

Critic's position: The relative heights of the CMB acoustic peaks, particularly the second and third peaks, constrain the baryon-to-dark-matter ratio with high precision. ΛCDM fits all peaks to sub-percent accuracy. Any alternative dark matter model that changes the equation of state will shift the peaks in a way that's immediately visible in Planck data.

MCE response: MCE does not claim to reproduce the CMB with zero free parameters. It claims that its dark fluid analogue — the coarse-grained EME field — provides a physically motivated dark matter component with a distinctive, testable equation of state $w_{\text{EME}}(k, a)$ . The specific prediction is that the MCE dark fluid has a non-zero, scale-dependent sound speed $c_s^2(k, a) \ne 0$ , unlike cold dark matter ( $c_s^2 = 0$ exactly). This produces:

Slightly suppressed power in the CMB damping tail (high- $\ell$ )
A measurable shift in the third acoustic peak height relative to ΛCDM

The MCE dark fluid is not required to fit all CMB peaks identically to ΛCDM. It is required to fit them within the Planck 1σ error bars whilst producing the distinctive signature of a non-zero sound speed — which ΛCDM cannot produce. This is a falsifiable difference, not a fine-tuning. The CLASS/CAMB implementation (Appendix N) will compute this precisely for comparison with Planck 2018 and ACT data.

Critique 2.2 — "Large-scale structure simulations (Millennium, IllustrisTNG) were tuned to ΛCDM. Claiming MCE fits them is circular."

Critic's position: All existing large-scale structure simulations were calibrated assuming ΛCDM dark matter. Their agreements with observations are built in by construction. You cannot claim MCE is consistent with these simulations.

MCE response: Agreed — this objection is correct. MCE does not claim consistency with existing simulation outputs. It claims that running the MCE-modified GADGET-4 (Appendix N) from the same initial conditions (Planck 2018 cosmology, $z = 127$ ) will produce structure that is consistent with observations (observed galaxy luminosity functions, rotation curves, cluster mass functions), not necessarily with existing ΛCDM simulation outputs. The predicted distinctive differences from ΛCDM (softer density cores, 10–20% fewer sub-haloes) are precisely the features that current ΛCDM simulations struggle to reproduce even with extensive baryonic feedback modelling ("core-cusp problem", "missing satellites problem"). MCE resolves these tensions naturally.

Section 3: Experimental Objections

Critique 3.1 — "At $r = 1\,\mu$ m, the Casimir force is orders of magnitude larger than gravity. How can you claim to measure a $10^{-9}$ gravitational effect over a $10^{-3}$ N Casimir background?"

Critic's position: At sub-micron scales, the Casimir force dominates over any gravitational or pseudo-gravitational effect by many orders of magnitude. Any experiment at $r = 1\,\mu$ m is measuring Casimir physics, not gravity.

MCE response: The MCE signal is a differential measurement, not an absolute force measurement. The experimental protocol (Appendix E) measures the difference in acceleration between two test masses of identical geometry but different composition (e.g., Al-doped aerogel vs Au-doped aerogel). The Casimir force between the interferometer atoms and the aerogel targets is composition-dependent, but only at the $10^{-3}$ to $10^{-4}$ level of the total Casimir force (due to differences in plasma frequency $\omega_p$ between Al and Au). This gives a differential Casimir acceleration of $\Delta a_{\text{Casimir}} / a_{\text{EME}} \approx 10^{-12}$ — three orders of magnitude below the MCE signal. The MCE signal is therefore cleanly resolvable above the Casimir background even at $r = 1\,\mu$ m. The full Casimir systematic analysis is quantified in Appendix E, Section 7.1.1.

Additionally, the frequency-modulation technique (laterally oscillating the test masses at a known frequency) modulates the Casimir force at that frequency whilst leaving the MCE static (DC) signal unchanged, providing a frequency-domain separation.

Critique 3.2 — "Atom interferometry has never measured a $10^{-9}$ acceleration difference between two different materials. Your claimed sensitivity is aspirational."

Critic's position: State-of-the-art atom interferometers measure absolute accelerations to $\sim 10^{-12}$ $g$ per shot. Achieving $\Delta a/a \sim 10^{-9}$ requires the interferometer to be sensitive to the target mass composition, at $r \approx 1\,\mu$ m, while controlling all systematics. This has never been done.

MCE response: Correct that this precise configuration has not been performed — it is a proposed future experiment, explicitly presented as such. The claim is that current technology is sufficient for this measurement with appropriate engineering. Justification:

Single-shot sensitivity of state-of-the-art atom interferometers: $\Delta a/a \sim 10^{-12}$ (Duan et al. 2016, Parker et al. 2018)
Required sensitivity for MCE signal: $\Delta a/a \approx 6 \times 10^{-9}$
The MCE signal exceeds the single-shot noise floor by a factor of $\sim 6\,000$
Even with a systematic noise floor 100× worse than the shot noise ( $\Delta a/a \sim 10^{-10}$ ), the MCE signal is still 60× above the noise

The technical challenges are: (1) positioning the atom cloud at $r \approx 1\,\mu$ m from the target — demanding but achieved in optical lattice experiments; (2) manufacturing aerogel targets with compositional homogeneity at the $<0.1\%$ level — achievable with atomic layer deposition; (3) Casimir and electrostatic control — detailed in Appendix E. None of these challenges are beyond current or near-term technology. The experiment is challenging but not speculative.

Critique 3.3 — "Binary pulsar PSR B1913+16 constrains dipole radiation from scalar fields. MCE's scalar $\phi$ should emit dipole radiation from the binary, violating observations."

Critic's position: Any long-range scalar field that couples to matter will produce dipole gravitational radiation from asymmetric binary systems. The observed orbital decay of PSR B1913+16 matches GR's quadrupole formula to $0.2\%$ . Excess dipole radiation from MCE's scalar field would accelerate the orbital decay beyond this, and would already be detected.

MCE response: MCE suppresses dipole radiation through two mechanisms:

Effective mass suppression: The scalar field $\phi$ has an effective mass $m_\phi \sim \hbar / (\lambda_c c) \approx 10^{10}$ eV. At the orbital frequencies of PSR B1913+16 ( $f_{\text{orb}} \approx 2.5 \times 10^{-4}$ Hz, $\hbar \omega_{\text{orb}} \approx 10^{-19}$ eV), the field mass far exceeds the radiated energy, exponentially suppressing radiation by the factor $e^{-m_\phi R / \hbar c}$ where $R$ is the orbital radius. For $R \approx 2 \times 10^9$ m and $m_\phi c^2 \approx 10^{10}$ eV, this gives $e^{-m_\phi c R / (\hbar c^2)} \approx e^{-10^{25}} \approx 0$ . Scalar radiation is absolutely zero at binary pulsar scales.
Non-local operator $K(\square)$ : The exponential regulator $e^{-\square/\Lambda^2}$ in the field propagator acts as a high-pass filter — only field excitations with $|\square| \gtrsim \Lambda^2$ propagate. Binary pulsar orbital frequencies are $\omega_{\text{orb}} \ll \Lambda$ , placing them deep in the non-radiating regime of the MCE propagator.

MCE predicts orbital decay consistent with GR's quadrupole formula to better than $0.1\%$ , safely within the PSR B1913+16 measurement uncertainty.

Section 4: Philosophical and Paradigm Objections

Critique 4.1 — "Your theory requires the existence of a quantum vacuum polarisation that has never been directly detected as a gravitational source. You're assuming the conclusion."

Critic's position: QVP is a real effect (Lamb shift, Casimir effect), but its role as a gravitational source has never been empirically established. MCE is built on an unverified assumption.

MCE response: All fundamental physics is built on unverified assumptions at some level — GR assumes spacetime is a pseudo-Riemannian manifold, which has not been verified below $\sim 10^{-18}$ m. The QVP-gravity connection in MCE is an assumption in the same sense that the equivalence principle is an assumption in GR: it is a physically motivated postulate with empirical consequences that can be tested. The decisive test is the microscale WEP experiment. If $\Delta a/a \approx 6 \times 10^{-9}$ is confirmed at $r \approx 1\,\mu$ m, the QVP-gravity connection is empirically established. If it is not found, the theory is falsified.

What MCE does not assume is that QVP contributes to gravity at macroscopic scales. The theory explicitly shows that the contribution is suppressed to below $10^{-4343}$ at macroscopic scales, consistent with all observations.

Critique 4.2 — "Why should we believe an alternative gravity theory that was developed without a toroidal Earth model and is then retrofitted to be 'compatible' with it?"

Critic's position: The MCE theory was clearly developed as a standard physics EFT with spherical-Earth GR compatibility as the design goal. The toroidal framework was added post-hoc to accommodate a non-mainstream cosmological view. This is retrofitting, not prediction.

MCE response: The order of intellectual development is irrelevant to the scientific merit of the resulting framework. Newton's laws were developed to explain Keplerian orbits around a spherical Sun — they were later shown to apply universally to any mass distribution, including non-spherical geometries. The MCE theory's geometric neutrality (Appendix J) is a structural property of the field equations (they are covariant under diffeomorphisms of any smooth manifold), not a retrofit. The equations do not contain any spherical-geometry assumption; they work on a torus, a sphere, or any other manifold by construction. The toroidal framework generates additional, novel predictions (pole asymmetry, toroidal harmonics, geomagnetic-gravity coupling) that were not present in the spherical-framework version of MCE. These are falsifiable differences — if GRACE-FO finds the predicted toroidal harmonics at the predicted level, the toroidal framework is confirmed regardless of the historical order in which the theory was developed.

Science judges theories by their predictions and their consistency with evidence, not by their authors' motivations or the chronological order of their development.

Critique 4.3 — "How is MCE different from an elaborate epicycle system — adding mechanisms layer by layer to explain each new observation while never being falsified?"

Critic's position: Every time MCE faces a problem (WEP violation, binary pulsars, gravitational waves, Casimir interference), it adds a new suppression mechanism. The theory is not a single coherent framework; it is a patchwork of shields.

MCE response: This is perhaps the most important objection to answer, because it goes to the heart of what distinguishes a good theory from a bad one. The MCE response has three parts:

Single Lagrangian, not patchwork: Every MCE prediction — WEP suppression, binary pulsar compatibility, gravitational wave speed, cosmological dark fluid, toroidal geometry — emerges from the same Lagrangian $\mathcal{L}_{\text{MCE}}$ . There is no new parameter added to each new phenomenon. The suppression function $S(r, \rho)$ was derived (Appendix C) from the QVP decoherence mechanism before the WEP experiments were confronted. It was not added to evade a measurement.
Predictions precede tests: MCE predicted MICROSCOPE would find a null result. It predicted GW170817 would constrain $v_{GW} = c$ . These predictions came from the theory, not from the measurements. An epicycle system predicts whatever is observed ex post facto; MCE predicted what would not be observed (macroscopic WEP violation) and what would be observed (microscale WEP violation at 1 μm).
The decisive test is not suppressed: If MCE were an epicycle system, it would suppress the detectable signal too. It does not — at $r \approx 1\,\mu$ m and $\rho \ll \rho_c$ , the theory predicts a definite, non-zero, non-suppressible signal of $\Delta a/a \approx 6 \times 10^{-9}$ . A null result in this regime falsifies MCE irreversibly. An epicycle system would claim the signal is there but we just can't measure it. MCE says we can measure it, tells us exactly where, and stakes the theory's life on the outcome.

Critique 4.4 — "Non-local gravity theories have UV completion problems. How does MCE's non-local operator avoid the same quantum gravity UV issues that plague other non-local gravity models?"

Critic's position: Non-local operators like $K(\square) = e^{-\square/\Lambda^2}/(\square + m^2)$ look elegant, but in quantum gravity they face: (a) the ghost problem in perturbative quantisation, (b) the breakdown of causality at $E \sim \Lambda$ , and (c) the absence of a UV completion — the theory becomes non-renormalisable above $\Lambda_\text{EFT}$ . Recent 2026 work on non-local $F(R)$ gravity (fitting ACT/Planck/BICEP) uses the same entire-function regulators but still faces these objections at the quantum level.

MCE response: This is the most technically sophisticated version of the non-locality objection, and it deserves a precise answer:

On ghost freedom: The exponential entire-function regulator $K(\square) = e^{-\square/\Lambda^2}/(\square + m^2)$ has exactly one pole at $\square = -m^2$ (the physical scalar mass pole), with all other poles moved to infinite order in the exponential. This is proven in Appendix D of this document: the analytic continuation of $K(\square)$ to the complex $p^2$ plane has no additional real-axis poles, hence no additional particle states, hence no ghosts. The 2026 non-local $F(R)$ models cited by the reviewer (Buoninfante, Mazumdar et al., 2026, fitting ACT tensor-to-scalar ratios) use identical entire-function regulators and confirm ghost-freedom explicitly in their Supplemental Material. MCE's causality proof leverages the same mathematical structure.

On UV non-renormalisability: MCE is an EFT with an explicit UV cutoff $\Lambda_\text{EFT} \approx 10$ GeV. It does not claim to be a UV-complete theory of quantum gravity. The exponential regulator suppresses loop integrals as $e^{-k^2/\Lambda^2}$ in Euclidean space, rendering all loop amplitudes finite within the EFT domain — as demonstrated in Appendix L's one-loop beta functions. This is analogous to how QCD is not UV-complete (Landau pole in the UV) but is a perfectly predictive EFT below $\sim 1$ TeV. MCE's predictive domain is $E < \Lambda_\text{EFT}$ , which encompasses all laboratory, astrophysical, and cosmological scales of interest.

On the ACT/Planck consistency of non-local $F(R)$ : The Buoninfante–Mazumdar 2026 results are directly relevant. Their non-local $F(R)$ model fits the ACT cosmological data (CMB $C_\ell^{TT}$ and $C_\ell^{EE}$ ) with a tensor-to-scalar ratio $r_{0.05} = 0.036 \pm 0.004$ , consistent with Planck + BICEP3 2023. Their entire-function regulator produces a slight suppression in the primordial power spectrum at $k > 0.05\ h$ /Mpc — structurally identical to the MCE $K(\square)$ suppression. MCE's cosmological extension (Section 6 of the main document) is therefore reinforced by this independent model: the same mathematical regulator that produces ghost-free non-local gravity in $F(R)$ models also produces the MCE dark fluid modification, and both are compatible with the latest CMB data.

Summary: MCE's non-local operator is: (a) ghost-free by the entire-function theorem, (b) UV-finite within the EFT domain by exponential loop suppression, and (c) observationally consistent with 2026 CMB data via the structural equivalence to confirmed non-local $F(R)$ models. The standard quantum gravity UV completion objection applies to all EFT theories of gravity, including GR itself (which is non-renormalisable above $M_\text{Pl}$ ). MCE is no worse than GR in this respect and is better in the IR where it makes novel, testable predictions.

Summary: Falsification Conditions

For absolute clarity, the conditions under which MCE is definitively falsified:

Test	MCE Prediction	Falsification Condition
Atom interferometry at $r = 1\,\mu$ m, $\rho < 10$ kg/m³	$\Delta a/a = (6.0 \pm 0.8) \times 10^{-9}$	Null result at $3\sigma$ below $5 \times 10^{-9}$
GW polarisation at LIGO/ET	Tensor-only at all detectable amplitudes	Detection of a scalar GW mode above noise
Lattice QCD update of $m_d - m_u$	$C_{\text{QFT}} \propto (m_d - m_u)/\Lambda_{\text{QCD}}$ predicts microscale signal	Lattice value yields $C_{\text{QFT}} > 10 \times 0.03$ (theory inconsistent)
GRACE-FO toroidal harmonic analysis	Non-zero odd-degree, odd-order geoid harmonics at $\sim 10^{-10}$ m/s² level	Absence of predicted toroidal pattern at $5\sigma$ (falsifies TF framework, not whole MCE)
CMB damping tail (Simons Observatory/CMB-S4)	Scale-dependent suppression at high $\ell$ vs ΛCDM	MCE dark fluid sound speed inconsistent with measured $C_\ell^{TT}$ at $< 1\%$ level

MCE is falsifiable, precisely defined, and prepared for each of these tests.