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Author:Mihail Turlakov
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Description:
# Fine dipole moment - numbers ## Fine dipole moment $\alpha_{QED} = \frac{e^2}{\hbar c} = \frac{d^2}{a^2 \hbar c}$ this is the definition of fine dipole moment depending on the length $a$ between charges $e$. The lengtha can be taken either as https://en.wikipedia.org/wiki/Bohr_radius or https://en.wikipedia.org/wiki/Classical_electron_radius ## imagine that there are no free charges, but only dipole interactions - let us compare with fine coupling in low-T glasses $\alpha_{QSNS} = P \frac{\gamma^2}{\rho c_t^2}$ where $P=\frac1frac{1}{erg*cm^3}$, $\gamma=erg$, and $\rho c^2= erg/cm^3$ # Parents * Fine structure constant
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