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The classical theory of electric and magnetic fields, both in the static and dynamic case. It also covers general questions about magnets, electric attraction/repulsion, etc. Distinct from electrical-engineering.

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How to compute $\chi_1$, a Lorentzian absorption in the following paper?

I have the following paper: https://arxiv.org/abs/1508.01213 on the third page, where they take: $$\chi_2(\omega)= \frac{-k\gamma}{(\omega-\omega_0)^2+\gamma^2},$$ I don't see how to explicitly comput …
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