Definition
Resonance is the QMU unit \(\mathrm{rson}\), defined as quantum frequency squared:
Since quantum frequency is the rate expression of chronovibration, resonance is the second-order rate structure of that temporal foundation.
Relation to Quantum Frequency
Quantum frequency is the first-order frequency foundation:
Resonance is the square of that foundation:
\(\mathrm{freq}={F_q}\) gives the quantum-frequency rate.
\(\mathrm{rson}={F_q}^{2}\) gives the frequency-squared resonance structure.
Propagation Relation
Photon velocity is defined by the QMU propagation identity:
Therefore resonance can be read from photon velocity and Compton length:
With the SI bridge \(\mathrm{velc}=c\), this also gives:
Relation to Aether Rotational Closure
Resonance appears directly in the Aether rotational closure identity:
This identity makes \(\mathrm{rson}\) a central bridge between chronovibration, Compton length, curl, Aether unit structure, and photon velocity.
Relation to Acceleration
Because \(\mathrm{rson}\) has frequency-squared structure, it naturally participates in acceleration-type QMU relations. Multiplying resonance by Compton length gives a length-rate squared structure:
This places resonance in the same dimensional neighborhood as quantum acceleration and second-order propagation response.
Relation to Angular Momentum
QMU angular momentum is:
Resonance contributes the next frequency order beyond angular momentum's single \({F_q}\) factor. This makes \(\mathrm{rson}\) important when moving from rotational action to second-order response.
APM / QMU Role
Resonance sits in the frequency-squared neighborhood of the QMU system. It connects chronovibration, photon velocity, Compton length, acceleration, angular momentum, curl, and Aether rotational closure. It should be treated as a first-class QMU unit rather than merely a descriptive frequency behavior.
Research Use
Resonance is a high-value research node because \(\mathrm{rson}={F_q}^{2}\) appears wherever time enters at second order. Useful directions include tracing every occurrence of \(\mathrm{rson}\), comparing frequency-squared units with acceleration-like units, studying \({A_u}\cdot\mathrm{curl}=\mathrm{rson}{\lambda_C}^{2}\), and mapping resonance through wave, radiation, and closure equations.