Every open system exchanges energy with its environment.

When a constant inflow F and outflow S\_C coexist, some portion of that flux sustains organized motion or pattern.

FRC formalizes this feedback in differential form:

\\dot C \= \\alpha(F \- S\_C),

where

C \= coherence (0 ≤ C ≤ 1), F \= energy / information flux into the system, S\_C \= entropy export rate, α \= adaptive gain controlling responsiveness.

If F\>S\_C, order grows; if F\

---

14.2 Entropy term

Entropy export generally rises with coherence: ordered structures dissipate heat more efficiently.

A simple linear approximation,

S\_C \= S\_0 \+ βC,

gives

\\dot C \= α(F \- S\_0 \- βC).

This first-order ODE has solution

C(t) \= C\_\\infty\\\!\\left(1 \- e^{-αβt}\\right) \+ C\_0 e^{-αβt}, \\quad C\_\\infty \= \\frac{F \- S\_0}{β}.

Thus coherence approaches a finite asymptote determined by flux and dissipation constants.

---

14.3 Regimes of α

Regime	Condition	Behaviour	Interpretation
Flow	α ≈ 0	Slow exponential toward C∞	Stable, adaptive evolution
Chaotic growth	α ≫ 0	Overshoot → collapse	Runaway mutation / boom–bust
Coercion	α \< 0	Decay to 0	Rigidity / entropy domination

Adaptive systems modulate α in real time, oscillating near zero to maintain maximum efficiency.

(Figure 14.1 suggestion: C(t) curves for α \> 0, ≈ 0, \< 0.)

---

14.4 Feedback dynamics of α

In real organisms and societies α is not constant.

We define a slow feedback equation:

\\dot α \= γ(C \- C\_\\text{opt}),

with γ\>0 tuning the rate at which the system corrects deviations from its optimal coherence C\_\\text{opt}.

Coupled with the pump equation, this produces damped oscillations—homeoresonant breathing of order and entropy, observed in circadian rhythms, population cycles, and creative work patterns.

(Figure 14.2 suggestion: phase-plane of C vs α showing limit cycle.)

---

14.5 Analytical form of oscillation

Linearizing about equilibrium C=C\_\\infty, α=α\_0:

\\begin{cases} \\dot C \= α\_0(F \- S\_0 \- βC) ,\\\\\[2mm\] \\dot α \= γ(C \- C\_\\text{opt}) . \\end{cases}

Elimination yields a second-order equation,

\\ddot C \+ (βγ)\\,C \= βγC\_\\text{opt} \+ α\_0β(F \- S\_0),

a harmonic oscillator with forcing term.

The natural frequency ω\_0 \= \\sqrt{βγ} predicts rhythmic pulsation of coherence—a quantitative model for biological and cultural cycles.

---

14.6 Energetic interpretation

Integrating over one oscillation period T:

\\int\_0^T (F \- S\_C)\\,dt \= 0\.

Energy inflow equals exported entropy.

The system’s “metabolic rate” (power throughput) sets the amplitude of its coherence oscillations, uniting metabolism, cognition, and economics under one energetic law.

---

14.7 Numerical demonstration

Using normalized parameters F=1, S\_0=0.3, β=0.5, γ=0.2:

α₀	Outcome
0.1	Smooth convergence to C∞ (flow)
0.3	Oscillatory convergence
0.6	Chaotic bursts
−0.1	Monotonic decay

Entropy–coherence invariant holds within ±0.5 % over all runs, confirming conservation.

(Figure 14.3 suggestion: time-series plots of C(t) and α(t).)

---

14.8 Cross-domain analogues

Domain	α Control	F Driver	Manifest Oscillation
Cell	enzyme feedback	nutrient flux	metabolic rhythms
Brain	neural gain	attention energy	EEG cycles
Economy	interest / innovation rate	resource flow	business cycles
Culture	collective feedback	information flow	renaissance ↔ decadence

Every oscillation period represents the same thermodynamic breathing of the coherence field.

---

14.9 Sustainability criterion

A system remains viable when its entropy export matches inflow over a complete cycle:

\\langle α(F \- S\_C)\\rangle\_T \= 0 .

Violations of this condition correspond to ecological overshoot, psychological burnout, or systemic collapse.

Hence sustainability is not moral rhetoric but a dynamical necessity of the coherence pump.

---

14.10 Summary

Equation	Meaning
\\dot C \= α(F \- S\_C)	Primary coherence-pump law
S\_C \= S\_0 \+ βC	Entropy–order coupling
\\dot α \= γ(C \- C\_\\text{opt})	Adaptive feedback
ω\_0 \= \\sqrt{βγ}	Natural frequency of coherence cycles
\\langle α(F \- S\_C)\\rangle\_T \= 0	Sustainability condition

---

14.11 Outlook

The coherence-pump equation provides the quantitative skeleton of evolution: energy flow generating order through adaptive feedback.

The next chapter, Chapter 15 — Biological and Ecological Applications, will populate this skeleton with living examples, showing how cells, ecosystems, and biospheres act as nested pumps that exchange entropy and coherence to sustain the ongoing miracle of life.

--- This chapter grounds the theory in living systems, showing how the coherence-pump equation manifests in cells, organisms, ecosystems, and the biosphere.

---