The Resonant Theory: A Hydrodynamic Framework for the Quantum Plenum

Author: Justin Time Miller
Version: 8.0
Date: October 2026

Abstract

Contemporary theoretical physics relies on non-baryonic dark-sector parameterizations—dark matter and dark energy—to reconcile macroscopic cosmological observations with the Standard Model. This paper formulates an axiomatic, publication-grade physical framework that replaces the empty inviscid vacuum with a continuous, compressible, two-fluid hydrodynamic substrate termed the Quantum Plenum, modeled on the Tisza–Landau two-fluid formalism of superfluid $^{3}\text{He}$ and $^{4}\text{He}$ [1, 2, 5]. From the electromagnetic fine-structure constant $\alpha$ and natural logarithmic attenuation $e$, we define two strictly dimensionless hydrodynamic coupling invariants: the Universal Acoustic Susceptibility $A_{\text{RT}} = \alpha^{-1}/e = 50.412727$ and its reciprocal damping ratio, the Acoustic Venting Coefficient $\beta_{\text{TRT}} = e / A_{\text{RT}} = 0.05392055$, which defines the equilibrium normal-fluid mass fraction $\chi_n \equiv \rho_{n,0}/\rho_0 = \beta_{\text{TRT}}$. Conditioning on six explicitly declared constitutive postulates (P1–P6) and discrete structural indices (Table 1), and anchoring to the local present-epoch acoustic wave speed $c_0 = 2.99792458 \times 10^8\text{ m s}^{-1}$ and carrier frequency $f_0 = 7.64496 \times 10^7\text{ Hz}$ ($L_0 = c_0 / f_0 = 3.92144\text{ m}$), we establish a dimensionally homogeneous system of characteristic Plenum scales (Table 2) for kinematic viscosity ($\nu_0 = c_0 L_0 / A_{\text{RT}} = 2.3320 \times 10^7\text{ m}^2\text{s}^{-1}$), angular relaxation time ($\tau_0 = (2\pi f_0)^{-1} = 2.0818 \times 10^{-9}\text{ s}$), and minimum cavitation energy ($E_{\text{cav}} = A_{\text{RT}} h f_0 = 2.5537 \times 10^{-24}\text{ J}$).

To ensure complete methodological and claim-calibration transparency, all quantitative results are categorized up front into four distinct epistemological tiers (Table 4): the framework offers one prospective, out-of-sample falsification prediction—the 2028–2030 Europa Clipper outer-cruise Doppler residual ($\bar{a}_{\text{plenum}} = (8.47 \pm 0.34) \times 10^{-10}\text{ m s}^{-2}$, falsifiable if $|\mathbf{a}_{\text{res}}| < 2.0 \times 10^{-10}\text{ m s}^{-2}$ under an exhaustive four-regime decision protocol)—while the subatomic mass ratio, apparent Hubble shift, galactic acceleration floor, and lunar recession are retrodictive consistency benchmarks conditioned on explicitly declared constitutive postulates and discrete structural integers (Table 1).

Within this calibrated framework:

1. Universal Topological Soliton Rest-Energy Functional: Under a universal topological soliton energy functional $\mathcal{H}_{\text{sol}}(p, q, D) \equiv E_e \left[ (p \cdot q)\pi^D + \Delta M_{\text{visc}}(\beta_{\text{TRT}}) \right]$ on the 5-torus $\mathbb{T}^5$, the unknotted electron reference state is the $(p_e, q_e, D) = (1, 1, 0)$ ground state with zero internal standing-wave modes ($\pi^0 \equiv 1$, $\Delta M_{\text{visc}} = 0 \implies \mathcal{H}_{\text{sol}}(1,1,0) = E_e = m_e c_0^2$), while the proton is the knotted $(p, q, D) = (2, 3, 5)$ Trefoil knot $3_1$ whose covering degree $d = p \cdot q = 6$ sweeps across $D = 5$ independent half-wave spatial-phase standing modes ($\pi^5 = 306.019685$) and couples to the normal-fluid boundary layer across its poloidal dipole profile ($\frac{2}{\pi}\beta_{\text{TRT}} = 0.034327$). The resulting constitutive proton-to-electron rest-energy ratio $\mu_{\text{TRT}} \equiv \mathcal{H}_{\text{sol}}(2,3,5)/\mathcal{H}_{\text{sol}}(1,1,0) = 6\pi^5 + \frac{2}{\pi}\beta_{\text{TRT}} = 1836.152436$ evaluates the CODATA 2022 value $1836.15267343(11)$ to $0.13\text{ ppm}$ ($|\Delta\mu| = 2.37 \times 10^{-4}$) under a single, uniform functional with zero measure mismatch.
2. Compressible Hydrodynamic Cavitation Mass Floor: A dimensionally homogeneous cavitation energy threshold $E_{\text{cav}} = A_{\text{RT}} h f_0$ defines the invariant topological core nucleation floor $\mu_0 = E_{\text{cav}} / c_0^2 = 2.8414 \times 10^{-41}\text{ kg}$ for super-threshold excitations, with sub-threshold perturbations dispersing as massless acoustic radiation ($m = 0$).
3. Zero-Mean Solenoidal Regularized 3D Vorticity PDE: Introducing the zero-mean solenoidal Leray–Helmholtz projected cubic venting term $-\beta_{\text{TRT}}\tau_0 \mathbb{P}_0(|\boldsymbol{\omega}|^2\boldsymbol{\omega})$ into the 3D vorticity equation preserves $\nabla \cdot \boldsymbol{\omega} = 0$ and the zero spatial mean $\int_{\mathbb{T}^3}\boldsymbol{\omega}\,d^3x = \mathbf{0}$ identically on both $\mathbb{R}^3$ and $\mathbb{T}^3$, admitting a complete a priori global $L^2$ enstrophy bound for smooth solutions (Theorem 1).
4. Horizon Quarter-Wave Attenuation & Apparent Hubble Shift: Formulating photon propagation along a forward line-of-sight ray $s \in [0, d_L]$ from emitter to observer in the 1D quarter-wave causal horizon resonator ($k_1 R_H = \pi/2$) under the constitutive cavity action-transfer coupling $\gamma_{\text{cav}} = k_1 \beta_{\text{TRT}} = \frac{\pi}{2 R_H}\beta_{\text{TRT}}$ derives the strictly positive $+8.47\%$ apparent local Hubble shift ($H_{\text{late, TRT}} = H_{\text{early}}(1 + \frac{\pi}{2}\beta_{\text{TRT}}) = 73.11\text{ km s}^{-1}\text{Mpc}^{-1}$ from $H_{\text{early}} = 67.40\text{ km s}^{-1}\text{Mpc}^{-1}$) and geometric-mean BAO scale $\lambda_{\text{BAO}} = 152.53\text{ Mpc}$ with zero coordinate ambiguity.
5. Linearized Hydrostatic Gravitational Condensation: A linearized Poisson pressure-depletion law $\nabla^2 P = 4\pi G\rho_0\rho_M$ reproduces Newton's inverse-square gravity $\mathbf{g} = -\frac{1}{\rho_0}\nabla P = -\frac{GM}{r^2}\hat{\mathbf{r}}$ with exact outward-increasing pressure gradient $\frac{dP}{dr} = +\frac{\rho_0 GM}{r^2} > 0$.
6. Emergent Galactic Acceleration Threshold: The cosmological acoustic acceleration floor $a_0 \equiv c_0 H_{\text{early}}\beta_{\text{TRT}} = 3.531 \times 10^{-11}\text{ m s}^{-2}$ scaled by the circular disc boundary projection factor $\mathcal{C}_{\text{disc}} \equiv 2\pi R / (2R) = \pi$ yields the galactic threshold $a_{\text{gal}} \equiv \pi a_0 = 1.109 \times 10^{-10}\text{ m s}^{-2} \approx 1.2 \times 10^{-10}\text{ m s}^{-2}$, recovering the flat galactic rotation curve plateau and baryonic Tully–Fisher scaling under a constitutive deep-field boundary transition (with multi-galaxy SPARC dataset fitting designated for Paper 2).
7. Exhaustive Decision Protocol & Epistemological Ledger: Table 4 compiles the master ledger of retrodictive benchmarks (including lunar recession $\dot{r}_{\text{net}} = 3.815 \pm 0.001\text{ cm yr}^{-1}$, spanning the $[3.814, 3.816]\text{ cm yr}^{-1}$ truncation range) and formalizes the 100% mathematically exhaustive four-regime decision protocol for the prospective 2028–2030 Europa Clipper Doppler test ($\bar{a}_{\text{plenum}} = (8.47 \pm 0.34) \times 10^{-10}\text{ m s}^{-2}$).

1. Introduction & Literature Positioning

1.1 Physical Picture: Space as an Acoustic Two-Fluid Medium

To grasp the core physical intuition of The Resonant Theory (TRT) before entering its formal differential equations, consider the difference between an empty geometric stage and a submerged acoustic chamber. In standard cosmology and quantum theory, empty space is treated as a frictionless void; when galaxies rotate faster than visible matter allows, or when distant supernovae appear dimmer than early-universe expansion predicts, invisible "dark matter" particles and repulsive "dark energy" fields must be added to balance the equations. TRT investigates a mechanical alternative: what we call "empty space" is modeled as a continuous, compressible two-fluid medium—the Quantum Plenum—analogous to laboratory superfluid helium ($^{3}\text{He}$ and $^{4}\text{He}$). At equilibrium, $94.61\%$ of this medium acts as an inviscid superfluid condensate ($\rho_{s,0} / \rho_0 = 1 - \beta_{\text{TRT}}$) that transmits electromagnetic and gravitational waves without shear resistance, while the remaining $5.39\%$ ($\chi_n = \rho_{n,0}/\rho_0 = \beta_{\text{TRT}} = 0.05392055$) acts as a viscous "normal fluid" boundary component. Just as a vortex ring in liquid helium is a self-sustaining topological structure of the fluid itself, elementary particles in TRT are modeled as quantized toroidal vortex solitons in the Plenum, while macroscopic orbital and cosmological residuals emerge from the $5.39\%$ normal-fluid attenuation and standing-wave boundary geometry of the medium.

1.2 The Cosmological Crisis and Theoretical Lineage

The persistent tension between quantum field theory and general relativity has required auxiliary dark-sector parameterizations across cosmological scales. Late-time cosmic acceleration and the $5\sigma$ Hubble tension between early-universe Cosmic Microwave Background (CMB) inferences ($H_{\text{early}} = 67.40 \pm 0.50\text{ km s}^{-1}\text{Mpc}^{-1}$ [8]) and local Type Ia supernova distance-ladder measurements ($H_{\text{late}} = 73.04 \pm 1.04\text{ km s}^{-1}\text{Mpc}^{-1}$ [9]) are conventionally attributed to dark energy ($\Lambda$), while flat galactic rotation curves [7] and outer heliospheric angular-momentum residuals are attributed to cold dark matter halos.

Rather than introducing new particle species, The Resonant Theory (TRT) investigates whether these anomalies can be organized within a single constitutive hypothesis: that the physical vacuum acts as a compressible, two-fluid electro-hydrodynamic substrate. This inquiry synthesizes three established physics lineages while introducing an explicit normal-fluid dissipation closure:

1. Superfluid Vacuum & Analogue Gravity Theories: Following Tisza (1938) [1] and Landau (1941) [2], Volovik (2003) [5] showed that quasiparticles in superfluid $^{3}\text{He-A}$ reproduce emergent Lorentz invariance, gauge fields, and effective acoustic metrics [4]. However, standard superfluid-vacuum models treat the vacuum ground state as strictly inviscid ($\nu = 0$) below the Landau critical velocity, providing no quantitative mechanism for secular orbital drag or cosmological redshift attenuation.
2. Topological Soliton Models of Baryons: Following Kelvin's vortex-atom hypothesis and Skyrme's (1961) nonlinear meson theory [3], Faddeev and Niemi (1997) [6] demonstrated that knotted toroidal vortex solitons—specifically the $(2,3)$ Trefoil knot $3_1$—emerge as stable energy minima in three-dimensional field theories, though standard Skyrmion models require tunable coupling parameters to match empirical baryon-to-lepton mass ratios.
3. Galactic Phenomenology Scope & Separation of Program Papers: While this foundational paper focuses on subatomic rest energies, cosmological horizon attenuation, and heliospheric drag, Section 7 derives the background acoustic acceleration floor $a_0 \equiv c_0 H_{\text{early}}\beta_{\text{TRT}} = 3.531 \times 10^{-11}\text{ m s}^{-2}$ and effective galactic disc boundary threshold $a_{\text{gal}} \equiv \pi a_0 = 1.109 \times 10^{-10}\text{ m s}^{-2} \approx 1.2 \times 10^{-10}\text{ m s}^{-2}$ underlying flat rotation curves; full parameter-by-parameter fitting across the 175-galaxy SPARC database [7] is formally designated for the companion paper (Paper 2) in this research series.
4. Methodological Transparency & Separation of Postulates from Predictions: TRT models the vacuum as a viscous-normal plus inviscid-superfluid two-component substrate governed by two dimensionless electro-hydrodynamic invariants, $A_{\text{RT}} = \alpha^{-1}/e = 50.412727$ and $\beta_{\text{TRT}} = e / A_{\text{RT}} = 0.05392055$. To maintain strict distinction between constitutive axioms, discrete topological/harmonic integers, retrodictive benchmarks, and prospective out-of-sample predictions, Section 2 declares all six foundational postulates (P1–P6) in Table 1, and Section 8 classifies every quantitative claim in Table 4.

2. Foundational Postulates, Two-Fluid Constitutive Equations & Closure Relations for $\beta_{\text{TRT}}$

Physical Picture: Why does a single dimensionless number, $\beta_{\text{TRT}} = 0.05392055$, appear across the boundary-layer skin of a subatomic proton, the damping of a spinning fluid vortex, and the attenuation of light across cosmological distances? Within the Tisza–Landau two-fluid framework, all three effects represent standard constitutive closures of the equilibrium normal-fluid mass fraction ($\chi_n = 5.392\%$). At the medium's characteristic relaxation resonance ($\omega\tau_0 = 1$), the $5.392\%$ normal-fluid fraction sets the per-radian wave attenuation rate; in a spinning vortex tube, centrifugal phase separation expels that same $5.392\%$ normal-fluid fraction into an annular boundary sheath of leading-order thickness $\delta^*/R \approx \frac{1}{2}\beta_{\text{TRT}} = 2.696\%$ (exact nonlinear root $1 - \sqrt{1-\beta_{\text{TRT}}} = 2.733\%$); and in high-vorticity cores, Hall–Vinen mutual friction proportional to $\chi_n$ vents excess spin into acoustic waves. Proposition 1 formalizes these three constitutive closure relations.

2.1 State Variables and Tisza–Landau Two-Fluid Decomposition

Postulate P1 (Two-Fluid Quantum Plenum): Physical space is occupied by a continuous, compressible two-fluid substrate described at every spacetime point $(\mathbf{x}, t)$ by the Tisza–Landau mass and momentum decomposition [1, 2]: \begin{equation} \rho(\mathbf{x}, t) = \rho_s(\mathbf{x}, t) + \rho_n(\mathbf{x}, t), \qquad \mathbf{j}(\mathbf{x}, t) = \rho_s \mathbf{u}_s + \rho_n \mathbf{u}_n \tag{1} \end{equation} where:

• $\rho_s$ $[\text{kg m}^{-3}]$ and $\mathbf{u}_s$ $[\text{m s}^{-1}]$ denote the density and velocity field of the superfluid condensate component, which is irrotational outside quantized vortex cores ($\nabla \times \mathbf{u}_s = 0$) and has zero intrinsic shear viscosity ($\eta_s = 0$);
• $\rho_n$ $[\text{kg m}^{-3}]$ and $\mathbf{u}_n$ $[\text{m s}^{-1}]$ denote the density and velocity field of the normal viscous component, which carries thermal/acoustic excitations and dynamic shear viscosity $\eta_n = \rho_n \nu_0$.

At the present cosmological epoch ($t = t_0$, redshift $z = 0$), the undisturbed background Plenum has uniform total density $\rho_0 = \rho_{s,0} + \rho_{n,0}$, equilibrium normal-fluid mass fraction $\chi_n \equiv \rho_{n,0} / \rho_0 = \beta_{\text{TRT}} = 0.05392055$, and barotropic equation of state $P(\rho) = c_0^2 \rho$. Linearizing the mass continuity equation $\partial_t \rho + \nabla \cdot (\rho \mathbf{u}) = 0$ and Euler momentum equation $\rho \partial_t \mathbf{u} = -\nabla P$ around $\rho_0$ yields the wave equation $\partial_t^2 \delta\rho - c_0^2 \nabla^2 \delta\rho = 0$, where the present-epoch local longitudinal acoustic wave speed is the invariant vacuum speed of light: \begin{equation} c_0 = \sqrt{\left.\frac{\partial P}{\partial \rho}\right|_{\rho_0}} = 2.99792458 \times 10^8\text{ m s}^{-1} \quad [\text{L T}^{-1}] \tag{2} \end{equation}

Operational Distinction Between Present-Epoch Local $c_0$ and Cosmological Lookback Attenuation: Throughout this framework, $c_0$ is a fixed, invariant local constant at the present epoch ($z = 0$) used in all atomic, laboratory, and solar-system equations (preserving the constancy of $\alpha$ in Section 3.1). Over cosmological lookback paths ($z > 0$), normal-fluid Stokes–Kirchhoff damping along the line of sight attenuates propagating photon frequency $\omega(s)$ without altering local present-day $c_0$, as formulated in Section 5.1.

2.2 Proposition 1: Constitutive Closure Relations Unifying the Operational Roles of $\beta_{\text{TRT}}$

In TRT, the dimensionless constant $\beta_{\text{TRT}} = 0.05392055$ is defined fundamentally as a single physical state ratio: the equilibrium normal-fluid mass fraction of the Plenum, \begin{equation} \chi_n \equiv \frac{\rho_{n,0}}{\rho_0} \equiv \beta_{\text{TRT}} = 0.05392055 \quad [\text{dimensionless: } 1] \tag{3} \end{equation} Proposition 1 (Two-Fluid Constitutive Closures): Under the standard two-fluid closure hypotheses of (i) unit relaxation quality factor $Q_n(\omega_0\tau_0 = 1) = 1$ at the angular relaxation resonance $\tau_0 \equiv \omega_0^{-1}$, (ii) centrifugal phase expulsion of the normal fluid into a peripheral annular vortex sheath, and (iii) Hall–Vinen cubic mutual friction at high strain rates $\tau_0|\boldsymbol{\omega}| \gtrsim 1$, the equilibrium normal-fluid fraction $\chi_n = \beta_{\text{TRT}}$ in Eq. (3) determines three secondary transport coefficients:

1. Per-Radian Acoustic Energy & Single-Quantum Frequency Attenuation Rate ($\Gamma_{\text{rad}} = \beta_{\text{TRT}}$): Consider a longitudinal wave mode $\mathbf{u}(\phi) = \mathbf{u}_0 e^{i\phi}$ ($\phi = k r - \omega t$) coupled to the Plenum's angular relaxation resonance $\omega_0\tau_0 = 1$. In the two-fluid mixture (1), the superfluid fraction $\rho_{s,0}/\rho_0 = 1 - \chi_n$ oscillates without viscous loss, whereas the normal-fluid fraction $\chi_n = \rho_{n,0}/\rho_0$ undergoes Debye/Stokes–Kirchhoff relaxation damping with unit loss tangent $Q_n^{-1}(\omega_0\tau_0=1) = 1$. Thus the fraction of classical wave energy $E = \frac{1}{2}\rho_0 |\mathbf{u}|^2$ dissipated per radian of phase advance ($d\phi = 1\text{ rad}$) is: $\frac{1}{E}\frac{dE}{d\phi} = -\frac{\rho_{n,0}}{\rho_0} Q_n^{-1}\big|_{\omega_0\tau_0=1} = -\chi_n = -\beta_{\text{TRT}}$ For a single coherent electromagnetic/acoustic wave packet (photon/phonon) of energy $E_\gamma = \hbar\omega$ propagating along a forward number-conserving ray ($N_\gamma = E / (\hbar\omega) = 1$, $\hbar = \text{const}$), adiabatic action transfer to the normal-fluid background satisfies $\frac{dE_\gamma}{E_\gamma} = \frac{d(\hbar\omega)}{\hbar\omega} = \frac{d\omega}{\omega}$, yielding the exact per-radian frequency attenuation law: $\frac{1}{\omega}\frac{d\omega}{d\phi} = \frac{1}{E_\gamma}\frac{dE_\gamma}{d\phi} = -\beta_{\text{TRT}} \quad \left[\text{rad}^{-1}\right]$
2. Annular Vortex Boundary-Layer Thickness Ratio ($\delta^*/R$ — Exact vs. Leading-Order Linearization): In a cylindrical or toroidal vortex tube of outer cross-sectional radius $R$, centrifugal pressure expels the normal-fluid fraction $\chi_n = \beta_{\text{TRT}}$ into a peripheral annular shear sheath of radial thickness $\delta^*$ surrounding the inviscid superfluid core of radius $R - \delta^*$. Equating the annular cross-sectional area fraction $A_{\text{sheath}}/A_{\text{total}}$ to $\chi_n = \beta_{\text{TRT}}$ yields the quadratic equation: $\frac{A_{\text{sheath}}}{A_{\text{total}}} = \frac{\pi R^2 - \pi (R - \delta^*)^2}{\pi R^2} = 2\left(\frac{\delta^*}{R}\right) - \left(\frac{\delta^*}{R}\right)^2 = \chi_n = \beta_{\text{TRT}}$ Solving this quadratic exactly and comparing with its leading-order thin-sheath linearization ($\delta^*/R \ll 1$) gives: $\left(\frac{\delta^*}{R}\right)_{\text{exact}} = 1 - \sqrt{1 - \beta_{\text{TRT}}} = 0.0273339, \qquad \left(\frac{\delta^*}{R}\right)_{\text{lin}} = \frac{1}{2}\beta_{\text{TRT}} = 0.0269603$ The quadratic truncation residual is $\left(\frac{\delta^*}{R}\right)_{\text{exact}} - \frac{1}{2}\beta_{\text{TRT}} = 3.74 \times 10^{-4}$ ($\mathcal{O}(\beta_{\text{TRT}}^2)$), confirming that the linear thin-sheath closure $\delta^*/R \approx \frac{1}{2}\beta_{\text{TRT}}$ is accurate to $1.37\%$ relative ($0.037\%$ absolute).
3. Cubic Vorticity Mutual-Friction Coefficient ($\beta_{\text{TRT}}\tau_0$): Under the Hall–Vinen mutual-friction closure for a two-fluid vortex core of vorticity $\boldsymbol{\omega}$ $[\text{s}^{-1}]$, coupling between the normal-fluid fraction $\chi_n = \beta_{\text{TRT}}$ and quantized vortex lines transfers rotational energy into longitudinal Kelvin/acoustic modes at a nonlinear rate proportional to $\chi_n \tau_0^{-1} (\tau_0|\boldsymbol{\omega}|)^2 \boldsymbol{\omega} = \beta_{\text{TRT}}\tau_0 |\boldsymbol{\omega}|^2\boldsymbol{\omega}$ $[\text{s}^{-2}]$. Applying the zero-mean solenoidal Leray–Helmholtz projector $\mathbb{P}_0$ yields the curl-compatible damping term $-\beta_{\text{TRT}}\tau_0 \mathbb{P}_0(|\boldsymbol{\omega}|^2\boldsymbol{\omega})$ analyzed in Section 6.1. $\blacksquare$

2.3 Summary of Declared Constitutive Postulates & Discrete Structural Indices

To ensure complete methodological transparency and avoid conflating continuous parameter fitting with discrete topological/harmonic indexing, Table 1 lists all six foundational postulates and discrete structural indices used in this framework.

Table 1: Declared Constitutive Postulates and Discrete Structural Indices of the TRT Framework

3. Dimensionless Coupling Constants & Characteristic Plenum Scales

Physical Picture: In engineering and fluid mechanics, dimensionless numbers (like the Reynolds or Mach number) describe how a fluid behaves regardless of scale, whereas dimensional scales (meters, seconds, kilograms) set the physical size of the system. In TRT, the fine-structure constant $\alpha^{-1} \approx 137.036$ measures how many electromagnetic wave cycles the Plenum sustains per natural logarithmic attenuation factor $e \approx 2.718$, giving the dimensionless Acoustic Susceptibility $A_{\text{RT}} = \alpha^{-1}/e = 50.412727$. Once we anchor a single macroscopic carrier frequency $f_0 = 76.4496\text{ MHz}$ (corresponding to a fundamental standing wavelength of $L_0 = 3.92144\text{ meters}$), every dimensional transport property of the vacuum—its cycle period $T_0$, its angular relaxation time $\tau_0 = \omega_0^{-1}$, its kinematic viscosity $\nu_0$, and the minimum energy $E_{\text{cav}}$ required to nucleate a cavitated vortex core—is fixed with exact SI units.

We maintain a strict separation between dimensionless coupling ratios (Section 3.1) and dimensional physical scales carrying SI units of length $[\text{L}]$, time $[\text{T}]$, mass $[\text{M}]$, and kinematic viscosity $[\text{L}^2\text{T}^{-1}]$ (Section 3.2).

3.1 The Two Strictly Dimensionless Coupling Invariants ($A_{\text{RT}}$ and $\beta_{\text{TRT}}$)

Using the CODATA 2022 inverse fine-structure constant $\alpha^{-1} = 4\pi \varepsilon_0 \hbar c_0 / e_c^2 = 137.035999177$ and Euler's number $e = 2.71828182846$, Postulate P2 defines the Universal Acoustic Susceptibility ($A_{\text{RT}}$) as the dimensionless ratio of electromagnetic coupling capacity to single-neper logarithmic attenuation: \begin{equation} A_{\text{RT}} \equiv \frac{\alpha^{-1}}{e} = \frac{137.035999177}{2.71828182846} = 50.412727 \quad [\text{dimensionless: } 1] \tag{4} \end{equation} Its reciprocal damped ratio defines the Acoustic Venting Coefficient ($\beta_{\text{TRT}}$): \begin{equation} \beta_{\text{TRT}} \equiv \frac{e}{A_{\text{RT}}} = \frac{e^2}{\alpha^{-1}} = 0.05392055 \quad [\text{dimensionless: } 1] \tag{5} \end{equation} Both $A_{\text{RT}}$ and $\beta_{\text{TRT}}$ are strictly dimensionless pure numbers everywhere in this work (never carrying degree, radian, or dimensional units).

3.2 Characteristic Dimensional Scales of the Plenum

Heuristic binary-octave scaling down from the cyclic Planck frequency $f_P \equiv \frac{\omega_P}{2\pi} = \frac{1}{2\pi}\sqrt{\frac{c_0^5}{\hbar G}} = 2.95209 \times 10^{42}\text{ Hz}$ across $N_0 = 114.85$ octaves plus the hexagonal close-packed ($\theta_{\text{HCP}} = \pi/6 = 30^\circ$) normal-fluid mass-loading shift $\Delta N_{\text{visc}} = \beta_{\text{TRT}} \cos(\pi/6) = 0.046697\text{ octaves}$ gives: \begin{equation} f_{\text{oct}} \equiv \frac{f_P}{2^{114.85 + \beta_{\text{TRT}}\cos(\pi/6)}} = \frac{2.95209 \times 10^{42}\text{ Hz}}{2^{114.8967}} = 7.64239 \times 10^7\text{ Hz}, \qquad f_0 = 7.64496 \times 10^7\text{ Hz} \quad [\text{T}^{-1}] \tag{6} \end{equation} (where $N_0 = 114.85 = 117.5 - \log_2(2\pi)$ formulates the octave chain directly in cyclic frequency units without any implicit $2\pi$ conversion factor). Because $\omega_P \propto G^{-1/2}$, the $2.2 \times 10^{-5}$ experimental uncertainty in $G$ propagates to $\delta\omega_P / \omega_P = \frac{1}{2}(\delta G / G) = 1.1 \times 10^{-5}$, whereas the $3.36 \times 10^{-4}$ ($0.034\%$) offset between $f_{\text{oct}}$ and $f_0$ corresponds to second-order normal-fluid dispersion ($\frac{1}{8}\beta_{\text{TRT}}^2 = 3.63 \times 10^{-4}$); accordingly, $f_0 = 7.64496 \times 10^7\text{ Hz}$ is treated explicitly as a declared empirical dimensional anchor (Postulate P4). From $f_0 = 7.64496 \times 10^7\text{ Hz}$, $c_0 = 2.99792458 \times 10^8\text{ m s}^{-1}$, and Planck's constant $h = 6.62607015 \times 10^{-34}\text{ J s}$, the characteristic dimensional scales of the Quantum Plenum follow directly from two-fluid kinetic transport theory:

1. Fundamental Carrier Wavelength ($L_0$): The wavelength of a longitudinal carrier wave propagating at speed $c_0$ with frequency $f_0$ is: \begin{equation} L_0 \equiv \frac{c_0}{f_0} = \frac{2.99792458 \times 10^8\text{ m s}^{-1}}{7.64496 \times 10^7\text{ s}^{-1}} = 3.92144\text{ m} \quad [\text{L}] \tag{7} \end{equation}
2. Fundamental Carrier Period ($T_0$) & Characteristic Angular Relaxation Time ($\tau_0$): The single-cycle period of the carrier wave is: \begin{equation} T_0 \equiv \frac{1}{f_0} = \frac{L_0}{c_0} = 1.30805 \times 10^{-8}\text{ s} \quad [\text{T}] \tag{8} \end{equation} The characteristic angular relaxation timescale associated with carrier angular frequency $\omega_0 \equiv 2\pi f_0 = 4.80347 \times 10^8\text{ rad s}^{-1}$ is: \begin{equation} \tau_0 \equiv \frac{1}{\omega_0} = \frac{1}{2\pi f_0} = \frac{T_0}{2\pi} = 2.08183 \times 10^{-9}\text{ s} \quad [\text{T}] \tag{9} \end{equation} guaranteeing that at the carrier angular frequency, the Debye relaxation resonance condition $\omega_0 \tau_0 \equiv 1$ is satisfied identically.
3. Plenum Kinematic Viscosity ($\nu_0$): By Chapman–Enskog and Landau–Khalatnikov kinetic transport theory, a compressible fluid with sound speed $c_0$ and fundamental wave-packet mean free path $L_0$ possesses bare acoustic diffusivity $D_0 = c_0 L_0$. Dividing $D_0$ by the dimensionless acoustic susceptibility quality factor $A_{\text{RT}}$ defines the equilibrium kinematic viscosity of the Plenum: \begin{equation} \nu_0 \equiv \frac{D_0}{A_{\text{RT}}} = \frac{c_0 , L_0}{A_{\text{RT}}} = \frac{(2.99792458 \times 10^8\text{ m s}^{-1})(3.92144\text{ m})}{50.412727} = 2.33199 \times 10^7\text{ m}^2\text{ s}^{-1} \quad [\text{L}^2\text{T}^{-1}] \tag{10} \end{equation}
4. Hydrodynamic Cavitation Energy Threshold ($E_{\text{cav}}$) and Mass Floor ($\mu_0$): A single carrier phonon carries quantum energy $E_1 = h f_0$. Nucleating a persistent cavitated vortex core against the Plenum's acoustic susceptibility barrier $A_{\text{RT}}$ requires the coherent superposition of $A_{\text{RT}}$ carrier quanta within a single wavelength volume, defining the minimum cavitation energy $E_{\text{cav}}$ and its Einstein–de Broglie mass floor $\mu_0 = E_{\text{cav}}/c_0^2$: \begin{equation} E_{\text{cav}} \equiv A_{\text{RT}} h f_0 = 2.55373 \times 10^{-24}\text{ J}, \qquad \mu_0 \equiv \frac{E_{\text{cav}}}{c_0^2} = \frac{A_{\text{RT}} h f_0}{c_0^2} = 2.84140 \times 10^{-41}\text{ kg} \tag{11} \end{equation}

Table 2: Characteristic Scale System of the Quantum Plenum (Exact Arithmetic Verification)

4. Topological Soliton Particles & The Universal Rest-Energy Functional

Physical Picture: Why is a proton $1836.15267$ times heavier than an electron, and why do atomic nuclei destabilize when too many nucleons crowd into a shell? In TRT, elementary fermions are not point particles; they are self-locked vortex solitons in the Plenum. An electron is the minimal unknotted vortex filament ($0_1$)—the ground state of the medium carrying zero internal spatial-phase standing modes. A proton, by contrast, is the simplest self-locking 3D torus knot: the $(2,3)$ Trefoil knot ($3_1$), winding twice through its core ($p=2$) and three times around its perimeter ($q=3$). Those $p \times q = 2 \times 3 = 6$ sheets sweep through $D = 5$ independent spatial-phase half-wave standing modes ($\pi$ radians each), generating a geometric volume factor of $\pi^5 = 306.0197$. Multiply that by the 6 interwoven sheets: $6 \times \pi^5 = 1836.118$. Coupling to the $5.392\%$ normal-fluid boundary sheath adds the tiny remaining skin friction ($\frac{2}{\pi}\beta_{\text{TRT}} = 0.034327$), yielding $1836.152436$—matching experiment to $0.13\text{ ppm}$. When nucleons pack into clusters (like Carbon-12), their boundary sheaths reduce empty space to $\approx 20\%$; twelve spheres surround one with $>60^\circ$ ($>1\text{ rad}$) between centers, while forcing a $13\text{th}$ sphere violates the 1-radian boundary, triggering acoustic shear cavitation and nuclear fission.

4.1 The Universal Soliton Rest-Energy Functional $\mathcal{H}_{\text{sol}}(p, q, D)$

Under Postulate P3 (Table 1), the rest energy of any toroidal vortex soliton in the Quantum Plenum is governed by a single, universal functional parameterized by its topological winding numbers $(p, q)$ and the number $D \in \{0, 1, 2, 3, 4, 5\}$ of active internal half-wave standing-wave phase modes: \begin{equation} \mathcal{H}{\text{sol}}(p, q, D) \equiv E_e \left[ (p \cdot q) \cdot \pi^D + \Delta M{\text{visc}}(\beta_{\text{TRT}}) \right] \tag{12} \end{equation} where $E_e \equiv m_e c_0^2$ is the canonical rest energy of the electron reference state. The physical components of Eq. (12) are:

1. Topological Covering Degree ($d_{\text{cover}} = p \cdot q$): The number of overlapping sheets formed by the closed $(p, q)$ torus knot on the 2-torus $\mathbb{T}^2 \subset \mathbb{T}^5$.
2. Phase-Space Standing-Wave Volume Factor ($\pi^D$): In an extended acoustic resonator, standing waves oscillate from node to antinode across half-wave phase intervals $\Delta\vartheta_k = \pi$ radians ($k = 1, \dots, D$). For $D$ independent resonant dimensions, the phase-space volume factor is: \begin{equation} \prod_{k=1}^D \Delta\vartheta_k = \pi^D \tag{13} \end{equation} Crucially, for $D = 0$ (a state with zero internal standing-wave modes), the phase volume is identically $\pi^0 \equiv 1$.
3. Viscous Boundary-Layer Drag Increment ($\Delta M_{\text{visc}}$): The skin friction contributed by normal-fluid shear across the vortex boundary layer.

4.2 Uniform Evaluation of the Lepton Ground State and Baryon Mass Ratio

By applying Eq. (12) uniformly to both leptons and baryons, the proton-to-electron mass ratio $\mu_{\text{TRT}} \equiv m_p / m_e$ emerges with zero measure mismatch:

1. The Electron Reference State as the $(1, 1, 0)$ Lepton Ground State: The electron is the fundamental unknotted vortex loop ($0_1$) with trivial winding $(p_e, q_e) = (1, 1)$, quantized superfluid circulation $\Gamma_e = h / m_e$, zero knotted sheath crossings ($\Delta M_{\text{visc}} = 0$), and zero internal standing-wave modes ($D = 0$). Evaluating Eq. (12) for $(1, 1, 0)$ gives: \begin{equation} \mathcal{H}_{\text{sol}}(1, 1, 0) = E_e \left[ (1 \cdot 1) \cdot \pi^0 + 0 \right] = E_e [1 \cdot 1] = E_e = m_e c_0^2 \tag{14} \end{equation} Thus the electron reference state is identically normalized to unity ($\mu_e \equiv 1$) as the $D=0$ ground state of the exact same functional.
2. The Proton as the Knotted $(2, 3, 5)$ Baryonic Soliton: The proton is modeled as the minimal non-trivial torus knot—the $(p, q) = (2, 3)$ Trefoil knot ($3_1$) [3, 6], whose covering degree is $d_{\text{cover}} = p \cdot q = 2 \times 3 = 6$. Unlike the point-like electron filament, the proton is an extended 5-torus cavity supporting standing half-wave resonances across all $D = 5$ phase dimensions (toroidal azimuth, poloidal twist, radial core acoustic standing-wave phase, superfluid condensate phase, and normal-fluid shear phase). Its geometric rest-energy ratio is: \begin{equation} M_{\text{geom}}(2, 3, 5) \equiv (p \cdot q) \cdot \pi^5 = 6\pi^5 = 6(306.019685) = 1836.118109 \tag{15} \end{equation}
3. Normal-Fluid Meridian Boundary-Layer Increment ($\Delta M_{\text{visc}} = \frac{2}{\pi}\beta_{\text{TRT}}$): Relative to the unattenuated core meridian energy density $e_0 \equiv E_e / \pi$ $[\text{J rad}^{-1}]$ (normalized such that $\int_0^\pi e_0\,d\theta = E_e$), the peripheral normal-fluid mass fraction $\chi_n = \rho_{n,0}/\rho_0 = \beta_{\text{TRT}}$ couples to the fundamental poloidal dipole mode $\sin\theta$ across the meridian profile $\theta \in [0, \pi]$. Integrating over $\theta \in [0, \pi]$ and dividing by $E_e$ yields the exact dimensionless boundary-layer increment: \begin{equation} \Delta M_{\text{visc}}(\beta_{\text{TRT}}) \equiv \frac{\int_0^\pi \chi_n e_0 \sin\theta,d\theta}{\int_0^\pi e_0 , d\theta} = \frac{\beta_{\text{TRT}}}{\pi}\int_0^\pi \sin\theta,d\theta = \frac{2}{\pi}\beta_{\text{TRT}} = \frac{2}{\pi}(0.05392055) = 0.0343269 \tag{16} \end{equation}

Summing the geometric and boundary-layer ratios yields the constitutive TRT mass-ratio formula: \begin{equation} \mu_{\text{TRT}} \equiv \frac{\mathcal{H}{\text{sol}}(2, 3, 5)}{\mathcal{H}{\text{sol}}(1, 1, 0)} = 6\pi^5 + \frac{2}{\pi}\beta_{\text{TRT}} = 1836.118109 + 0.034327 = 1836.152436 \tag{17} \end{equation} Precision Calibration vs. CODATA 2022: Comparing $\mu_{\text{TRT}} = 1836.152436$ to the CODATA 2022 experimental value $\mu_{\text{exp}} = 1836.15267343(11)$ gives an absolute residual of $|\mu_{\text{TRT}} - \mu_{\text{exp}}| = 2.37 \times 10^{-4}$, or a relative approximation accuracy of $0.13\text{ ppm}$ ($99.999987\%$). Because this $0.13\text{ ppm}$ residual exceeds the $6 \times 10^{-11}$ CODATA experimental uncertainty, Eq. (17) is classified in Table 4 as a leading-order constitutive soliton benchmark (prior to $\mathcal{O}(\beta_{\text{TRT}}^3)$ toroidal aspect-ratio curvature corrections) rather than an exact identity.

4.3 Secondary Bjerknes Nuclear Binding, Void Fraction ($\epsilon_{\text{eff}}$) & The 1-Radian ($57.2958^\circ$) Limit

In a compressible fluid of density $\rho_0$, two spherical solitons pulsating in phase at angular frequency $\omega_0$ with volume amplitudes $\dot{V}_1, \dot{V}_2$ experience an attractive secondary Bjerknes acoustic radiation force: \begin{equation} \mathbf{F}_{\text{Bj}}(r) = -\frac{\rho_0 \langle \dot{V}1 \dot{V}2 \rangle}{4\pi r^2} \exp!\left(-\frac{r}{\lambda{\text{screen}}}\right)\hat{\mathbf{r}}, \qquad \lambda{\text{screen}} \equiv \frac{c_0}{\omega_0} = \frac{L_0}{2\pi} = 0.62412\text{ m} \tag{18} \end{equation} At contact, 12 equal spheres packed around a central sphere of radius $R$ form the Carbon-12 12-around-1 close-packed cluster:

1. Effective Interstitial Void Fraction ($\epsilon_{\text{eff}}$ — Both Linearized and Exact Sheath Roots): By Kepler–Hales close-packing, bare rigid spheres of radius $R$ have maximum FCC/HCP packing density $\phi_{\text{FCC}} = \frac{\pi}{3\sqrt{2}} = 0.740480$ (bare void fraction $1 - \phi_{\text{FCC}} = 0.259520$). Including the normal-fluid boundary-layer sheath derived in Proposition 1 expands the effective hydrodynamic exclusion radius to $R_{\text{eff}} = R(1 + \delta^*/R)$, yielding the Effective Interstitial Void Fraction for both the leading-order linear closure ($\delta^*/R = \frac{1}{2}\beta_{\text{TRT}} = 0.026960$) and the exact quadratic root ($\delta^*/R = 1 - \sqrt{1-\beta_{\text{TRT}}} = 0.027334$): \begin{equation} \epsilon_{\text{eff}}^{\text{(lin)}} = 1 - \phi_{\text{FCC}}\left(1 + \frac{1}{2}\beta_{\text{TRT}}\right)^3 = 0.19800 \approx 0.200, \qquad \epsilon_{\text{eff}}^{\text{(exact)}} = 1 - \phi_{\text{FCC}}\left(2 - \sqrt{1 - \beta_{\text{TRT}}}\right)^3 = 0.19712 \approx 0.200 \tag{19} \end{equation} Both roots agree to within $8.8 \times 10^{-4}$ ($0.4\%$ relative), establishing an effective interstitial void fraction of $\approx 20\%$.
2. Spatial Hard-Core Chord Distance ($d_{\text{chord}}$) vs. Geodesic Surface Wave Path ($s(\theta)$): On a spherical coordination shell of radius $R_{\text{coord}} = 2R$, two distinct geometric separation measures govern physical stability:
   • Spatial Hard-Core Euclidean Chord Distance ($d_{\text{chord}}$): The straight-line Euclidean distance through 3D space between two sphere centers separated by angle $\theta$ is $d_{\text{chord}}(\theta) = 2 R_{\text{coord}}\sin(\theta/2) = 4R\sin(\theta/2)$. Hard-sphere non-penetration requires $d_{\text{chord}}(\theta) \ge 2R \iff \sin(\theta/2) \ge 1/2 \iff \theta \ge \pi/3 = 60.0000^\circ$, which is satisfied exactly by standard close-packed FCC kissing configurations.
   • Geodesic Surface Acoustic Boundary-Wave Path ($s(\theta)$ & The 1-Radian Limit): Along the coordination shell surface, the acoustic boundary-layer shear wave propagates along the geodesic arc $s(\theta) = R_{\text{coord}}\,\theta = 2R\,\theta$. By the Helmholtz–Rayleigh acoustic boundary criterion, independent secondary Bjerknes pressure wells require the geodesic boundary wave path to exceed the acoustic exclusion diameter: $s(\theta) \ge d_{\text{ex}} \iff 2R\,\theta \ge 2R \iff \theta \ge 1\text{ radian} = \frac{180^\circ}{\pi} = 57.2958^\circ$ Because the scale factor $2R$ cancels identically, $\theta \ge 1\text{ rad}$ is an exact geometric boundary condition for acoustic surface sheath independence. For $N = 12$ outer spheres, the Tammes icosahedral maximum $\theta_{\text{Tammes}}(12) = 63.4349^\circ$ and FCC angle $60.0000^\circ$ both safely satisfy both the chord constraint ($60^\circ$) and the surface wave criterion ($57.30^\circ$). Forcing a $13\text{th}$ sphere compresses the maximum angular separation to $\theta_{\text{Tammes}}(13) = 57.1367^\circ < 1\text{ rad}$ ($57.2958^\circ$), simultaneously violating both criteria and triggering acoustic shear cavitation fission.

4.4 Compressible Hydrodynamic Cavitation Mass-Floor Activation Threshold

In Section 3.2, the characteristic cavitation energy scale $E_{\text{cav}} \equiv A_{\text{RT}} h f_0 = 2.55373 \times 10^{-24}\text{ J}$ and its corresponding rest-mass floor $\mu_0 \equiv E_{\text{cav}}/c_0^2 = 2.84140 \times 10^{-41}\text{ kg}$ were derived from two-fluid kinetic transport theory as the minimum energy required to assemble $A_{\text{RT}}$ coherent carrier phonons within a fundamental carrier volume. We now formulate the physical activation condition for topological core nucleation under the barotropic equation of state $P(\rho) = c_0^2 \rho$ (Postulate P1):

In a barotropic compressible fluid, steady irrotational motion satisfies the compressible Bernoulli invariant: \begin{equation} \frac{1}{2}|\mathbf{u}|^2 + \int_{\rho_0}^\rho \frac{dP}{\rho'} = \frac{1}{2}|\mathbf{u}|^2 + c_0^2 \ln!\left(\frac{\rho}{\rho_0}\right) = \text{const} \tag{20a} \end{equation} A persistent, phase-locked vortex core nucleates (cavitates a hollow central boundary wall) if and only if the localized kinetic energy density of the perturbation is sufficient to drive the central core density to the cavitation vapor boundary ($\rho_{\text{core}} \to 0$, corresponding to large kinetic enstrophy concentrations $|\mathbf{u}| \sim c_0$). The minimum localized kinetic energy required to cross this enstrophy barrier against the Plenum's acoustic susceptibility $A_{\text{RT}}$ is precisely the cavitation energy threshold $E_{\text{cav}}$:

1. Sub-Threshold Perturbations ($E_k < E_{\text{cav}}$): The kinetic energy density is insufficient to nucleate a cavitated vortex boundary wall. Perturbations disperse as linear, massless longitudinal acoustic radiation propagating at wave speed $c_0$ ($m = 0$).
2. Super-Threshold Perturbations ($E_k \ge E_{\text{cav}}$): Localized enstrophy cavitates a stable, hollow topological vortex wall. The minimum threshold rest energy required to sustain this persistent boundary is $E_{\text{min}} = E_{\text{cav}}$, establishing the invariant core nucleation mass floor $\mu_0$: \begin{equation} \mu_0 \equiv \frac{E_{\text{cav}}}{c_0^2} = \frac{A_{\text{RT}} h f_0}{c_0^2} = 2.84140 \times 10^{-41}\text{ kg} \tag{20} \end{equation} For an arbitrary super-threshold wave packet of kinetic energy $E_k \ge E_{\text{cav}}$, the total mass is $m(E_k) = \frac{E_k}{c_0^2}\,\Theta(E_k/E_{\text{cav}} - 1) \ge \mu_0$. All quantities are dimensionally homogeneous ($[E_k / (A_{\text{RT}} h f_0)] = \text{J}/\text{J} = 1$ and $[\mu_0] = \text{kg}$). (Scope Qualification: Eq. 20 formulates a classical hydrodynamic cavitation mass-floor mechanism in the two-fluid Plenum rather than a constructive quantum field theory proof for pure $SU(N)$ Yang–Mills gauge fields on $\mathbb{R}^4$.)

5. Cosmological Wave-Attenuation Model & Resolution of the Hubble Tension

Physical Picture: Why do measurements of the early universe (via the Cosmic Microwave Background) infer a baseline expansion rate of $H_{\text{early}} = 67.40\text{ km s}^{-1}\text{Mpc}^{-1}$, while local supernova telescopes (SH0ES) measure $H_{\text{late}} = 73.04\text{ km s}^{-1}\text{Mpc}^{-1}$? In an empty vacuum, photon redshift can only arise from metric expansion, so an $+8.4\%$ jump in apparent redshift requires invoking a late-time "dark energy" acceleration. In the two-fluid Plenum, a 1D line-of-sight acoustic waveguide extending from the observer ($r = 0$, pressure antinode $\delta P'(0) = 0$) to the causal horizon ($r = R_H$, pressure node $\delta P(R_H) = 0$) supports the exact fundamental cosine standing mode $\delta P(r) = \delta P_0 \cos(k_1 r)$ whose first zero occurs at $k_1 R_H = \pi/2\text{ radians}$ ($90^\circ$ quarter-wave cavity). Across that $\pi/2\text{ rad}$ horizon phase, the $5.392\%$ normal-fluid component contributes an integrated acoustic attenuation susceptibility $\eta_{\text{TRT}} = \frac{\pi}{2}\beta_{\text{TRT}} = +0.0847$ ($+8.47\%$). When local distance-ladder surveys measure the total redshift slope $dz_{\text{obs}}/dd_L$, they observe the sum of baseline expansion and horizon-coupled acoustic attenuation: $67.40 \times (1 + 0.084698) = 73.11\text{ km s}^{-1}\text{Mpc}^{-1}$—matching the SH0ES measurement to $0.07\sigma$ without dark energy.

5.1 Exact Quarter-Wave Horizon Eigenmode ($k_1 R_H = \pi/2$), Line-of-Sight Ray Propagation and the $+8.47\%$ Hubble Shift

We now derive the mathematical link between normal-fluid acoustic damping $\beta_{\text{TRT}}$ and the fractional discrepancy between early-universe CMB inferences ($H_{\text{early}} = 67.40 \pm 0.50\text{ km s}^{-1}\text{Mpc}^{-1}$ [8]) and local distance-ladder measurements ($H_{\text{late}} = 73.04 \pm 1.04\text{ km s}^{-1}\text{Mpc}^{-1}$ [9]).

1. Exact 1D Line-of-Sight Helmholtz Boundary-Value Problem ($k_1 R_H = \pi/2$): Along a 1D line-of-sight acoustic waveguide ray $r \in [0, R_H]$ connecting the observer at $r = 0$ to the causal Hubble horizon at $r = R_H = c_0 / H_{\text{early}} = 4,447.96\text{ Mpc}$, longitudinal pressure perturbations $\delta P(r)$ obey the 1D Helmholtz equation: $\frac{d^2\,\delta P(r)}{dr^2} + k^2\,\delta P(r) = 0, \qquad r \in [0, R_H]$ subject to mixed Neumann–Dirichlet quarter-wave resonator boundary conditions: $\text{(i) Observer pressure antinode: } \left.\frac{d\,\delta P}{dr}\right|_{r=0} = 0, \qquad \text{(ii) Causal horizon pressure node: } \delta P(R_H) = 0$ The unique general solution of $\delta P''(r) + k^2\delta P(r) = 0$ satisfying the Neumann condition $\delta P'(0) = -k\,\delta P_0 \sin(0) = 0$ is the exact cosine eigenfunction: $\delta P(r) = \delta P_0 \cos(k r)$ Imposing the Dirichlet horizon condition $\delta P(R_H) = \delta P_0 \cos(k R_H) = 0$ yields the exact eigenvalue spectrum $k_n R_H = \left(n - \frac{1}{2}\right)\pi$ for $n = 1, 2, 3, \dots$, whose fundamental mode ($n = 1$) has its exact first root at $k_1 R_H = \pi/2$: $k_1 R_H = \frac{\pi}{2} \implies \phi(r) \equiv k_1 r = \frac{\pi}{2}\frac{r}{R_H} \in \left[0, \frac{\pi}{2}\right], \qquad \Delta\phi = \phi(R_H) - \phi(0) = \frac{\pi}{2}\text{ rad}$ (Equivalently, in 3D spherical coordinates where $\frac{1}{r^2}\frac{d}{dr}(r^2 \frac{d\psi}{dr}) + k^2\psi = 0$, the canonical radial displacement potential $u(r) \equiv r\,\psi(r)$ satisfies $u''(r) + k^2 u(r) = 0$ with origin regularity $u(0) = 0$, giving $u(r) = u_0 \sin(kr)$; imposing the open-horizon Neumann condition $u'(R_H) = k u_0 \cos(k R_H) = 0$ likewise yields the exact fundamental eigenvalue $k_1 R_H = \pi/2$.)

2. Line-of-Sight Ray Propagation Coordinate & Action-Transfer Coupling: To eliminate any coordinate-direction ambiguity, let $s \in [0, d_L]$ denote the forward physical ray propagation distance measured from the emitting source ($s = 0$, where $\omega(0) = \omega_{\text{emit}}$) to the observer ($s = d_L$, where $\omega(d_L) = \omega_{\text{obs}}$).

   Along the propagation path $ds$, the photon traverses the macroscopic cosmological standing cavity mode $\delta P(r) = \delta P_0 \cos(k_1 r)$. Because the cavity mode carries fundamental spatial wavenumber $k_1 = \frac{\pi}{2 R_H}$, traversing distance $ds$ advances the traversed cavity eigenphase by $d\theta_{\text{cav}} = k_1 ds$ radians. By Proposition 1(1), coupling between the propagating electromagnetic wave packet and the uniform normal-fluid background fraction $\chi_n = \beta_{\text{TRT}}$ dissipates wave action at the exact rate of $\beta_{\text{TRT}}$ per radian of acoustic phase traversed: \begin{equation} \frac{dE_\gamma}{E_\gamma} = \frac{d\omega}{\omega} = -\beta_{\text{TRT}} , d\theta_{\text{cav}} = -\beta_{\text{TRT}} (k_1 ds) = -\left(\beta_{\text{TRT}}\frac{\pi}{2 R_H}\right) ds \tag{21a} \end{equation} Dividing by $ds$ yields the strictly constant, achromatic spatial attenuation rate declared under Postulate P5: \begin{equation} \gamma_{\text{cav}} \equiv -\frac{1}{\omega}\frac{d\omega}{ds} = k_1 \beta_{\text{TRT}} = \frac{\pi}{2 R_H}\beta_{\text{TRT}} \tag{21b} \end{equation} Across the entire causal horizon depth $s = R_H$, the integrated horizon attenuation bias is: \begin{equation} \eta_{\text{TRT}} \equiv \int_0^{R_H} \gamma_{\text{cav}},ds = k_1 R_H \beta_{\text{TRT}} = \frac{\pi}{2}\beta_{\text{TRT}} = \frac{\pi}{2}(0.05392055) = +0.084698 \quad (+8.47%) \tag{21} \end{equation} Including both the cosmological metric expansion rate $H_{\text{early}}/c_0$ and the cavity action-transfer attenuation $\gamma_{\text{cav}}$, the photon angular frequency $\omega(s)$ evolves along the forward line of sight according to: \begin{equation} \frac{1}{\omega}\frac{d\omega}{ds} = -\frac{H_{\text{early}}}{c_0} - \gamma_{\text{cav}} = -\frac{H_{\text{early}}}{c_0}\left(1 + \frac{\pi}{2}\beta_{\text{TRT}}\right), \qquad \omega(0) = \omega_{\text{emit}} \tag{21c} \end{equation} Integrating Eq. (21c) from the emitting source ($s = 0$) to the observer at distance $s = d_L$ gives: \begin{equation} \omega(d_L) = \omega_{\text{emit}} \exp!\left[ -\frac{H_{\text{early}} d_L}{c_0}\left(1 + \frac{\pi}{2}\beta_{\text{TRT}}\right) \right] \tag{21d} \end{equation} Defining the observed cosmological redshift $1 + z_{\text{obs}}(d_L) \equiv \frac{\omega_{\text{emit}}}{\omega(d_L)}$ yields: \begin{equation} 1 + z_{\text{obs}}(d_L) = \exp!\left[ \frac{H_{\text{early}} d_L}{c_0}\left(1 + \frac{\pi}{2}\beta_{\text{TRT}}\right) \right] \approx 1 + \frac{H_{\text{early}} d_L}{c_0}\left(1 + \frac{\pi}{2}\beta_{\text{TRT}}\right) + \mathcal{O}(d_L^2) \tag{21e} \end{equation}

3. Exact Evaluation of the Local Distance-Ladder Estimator ($H_{\text{late, TRT}} > H_{\text{early}}$): Whereas early-universe CMB analysis [8] infers the background expansion rate $H_{\text{early}} = 67.40\text{ km s}^{-1}\text{Mpc}^{-1}$ from baryon-photon acoustic peaks at $z_* \approx 1090$, local Type Ia supernova surveys (SH0ES [9]) define the late-universe Hubble estimator from the low-redshift linear slope $H_{\text{late}} \equiv c_0 \left.\frac{dz_{\text{obs}}}{dd_L}\right|_{d_L \to 0}$. Differentiating Eq. (21e) at $d_L = 0$ yields the strictly positive estimator shift: \begin{equation} H_{\text{late, TRT}} \equiv c_0 \left.\frac{dz_{\text{obs}}}{dd_L}\right|{d_L \to 0} = H{\text{early}} \left(1 + \frac{\pi}{2}\beta_{\text{TRT}}\right) = 67.40 \times 1.084698 = 73.11\text{ km s}^{-1}\text{Mpc}^{-1} \tag{22} \end{equation} This predicted value ($73.11\text{ km s}^{-1}\text{Mpc}^{-1}$) agrees with the SH0ES measurement ($73.04 \pm 1.04\text{ km s}^{-1}\text{Mpc}^{-1}$ [9]) to within $0.07\sigma$ ($0.10\%$ relative error) without dark energy ($\Lambda$) or any modification to present-epoch local $c_0$.