In the previous part we treated coherence as a measurable complement to entropy.

To turn that insight into predictive physics we now require an explicit dynamical law.

How does coherence C(t) evolve in time?

How does the system decide when to remain fluid, when to crystallize, or when to collapse?

Hermann Haken’s Synergetics offers the starting point.

He showed that in open, nonlinear systems, a few order parameters dominate the collective behaviour of countless microscopic variables.

These macroscopic coordinates “enslave” the micro-dynamics, guiding them toward patterns that minimize dissipation.

Fractal Resonance Coherence (FRC) reformulates this insight by identifying the order parameter with coherence C, the control parameter with potential Ψ, and the system’s responsiveness with receptivity R.

Together they form the triad that governs the adaptive resonance of any open system.

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5.2 The order-parameter equation

In Haken’s canonical form, an order parameter A near a bifurcation satisfies

\\frac{dA}{dt} \= εA \- g|A|^2A,

where ε represents the control parameter and g\>0 the saturation term.

Replacing A with a real coherence measure C and normalizing constants gives

\\dot C \= α(F \- S\_C),

where F is the external flux of free energy, S\_C the entropy exported per unit time, and α an adaptive gain that tunes the effective feedback strength.

This is the coherence-pump equation, first encountered phenomenologically in Part I.

At equilibrium, F=S\_C and \\dot C \= 0: the system reaches homeoresonance.

If F\>S\_C, coherence rises; if F\

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5.3 Receptivity and potential

The coefficients of the original synergetic equation can be decomposed into FRC’s physical–informational variables:

\\Delta S \= RΨC.

Receptivity R measures how open the system is to feedback and perturbation. Potential Ψ represents the gradient of available free energy or information. Coherence C quantifies the degree of alignment among components.
Their product determines the instantaneous change in entropy: negative values (R,Ψ\>0) create order; positive values (R\<0) produce disorder or coercive rigidity.

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5.4 Critical transitions and bifurcations

When a control parameter crosses a threshold Ψ\_c, small fluctuations become amplified; the system self-organizes.

Linear stability analysis of the coherence-pump equation gives

C(t) \= C\_0 e^{α(F \- S\_C)t}.
α(F \- S\_C) \> 0: exponential rise—coherence creation. α(F \- S\_C) \= 0: steady-state flow. α(F \- S\_C) \< 0: decay or chaos.

This reproduces the universal features of pattern formation: onset, saturation, and breakdown.

(Suggested figure: bifurcation diagram showing transition from random to ordered regime as Ψ passes threshold.)

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5.5 Energy landscape interpretation

Systems may be visualized as moving on an energy–information surface whose gradient is the entropy production rate.

Regions of minimal entropy correspond to attractor basins of high coherence.

The adaptive parameter α continuously reshapes this landscape, enabling the system to seek configurations that minimize overall dissipation while maximizing information throughput.

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5.6 From lasers to living tissue

System	Control Parameter Ψ	Order Parameter C	Observable	Behaviour
Laser cavity	pump energy	optical field coherence	intensity	sudden threshold emission
Chemical oscillator	reagent concentration	reaction phase synchrony	color oscillation	rhythmic pattern
Heart tissue	ion flux	phase coupling of pacemaker cells	ECG coherence	steady heartbeat
Neural network	synaptic excitation	EEG synchrony	power spectrum	flow state or seizure

Each case follows the same bifurcation logic: above a critical Ψ\_c, the coherence variable C emerges spontaneously.

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5.7 Entropy accounting

Integrating the coherence-pump equation over a cycle yields

\\int dS \= \-k\_\ \\int d\\ln C ,

confirming that total entropy production over time equals the coherence gained, scaled by k\_\.

Pattern formation is therefore the temporal integral of entropy–coherence reciprocity.

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5.8 Toward adaptive resonance

Real systems are rarely fixed at one set of parameters.

They adjust their own receptivity R(t) and potential Ψ(t) in response to feedback.

This adaptive self-tuning introduces the next level of dynamics—the Adaptive Resonance Formula (ARF) proper—which quantifies how systems learn from perturbation to maintain homeoresonance near α≈0.

\\Delta S \= RΨC

serves as the bridge between the macroscopic pattern laws of synergetics and the cognitive or ecological self-regulation explored later.

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5.9 Key takeaways

Principle	Expression	Meaning
Coherence-pump equation	\\dot C \= α(F \- S\_C)	Dynamics of order creation
Transformation law	ΔS \= RΨC	Entropy change per resonance event
Critical threshold	Ψ \= Ψ\_c	Onset of self-organization
Homeoresonance	F \= S\_C , α≈0	Steady-flow equilibrium

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5.10 Preview

In the next chapter we derive the full Adaptive Resonance Formula, showing how receptivity R and potential Ψ co-evolve with coherence to yield the three universal regimes of all complex systems:

Flow (balanced α) — creative, adaptive order.
Chaos (α \> 0\) — runaway instability.
Coercion (R \< 0\) — rigid, brittle order.

These regimes will form the mathematical grammar of resonance used throughout the rest of the book.

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