Zhaose’s Physics Notes
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Axion-photon Compton Scattering
physics
QFT
The effective axion-photon lagrangian can be written as:
\mathcal{L}_{\alpha\gamma} = (\frac{1}{2} \partial_\mu a \, \partial^\mu a - \frac{1}{2}m^2 a^2) + (-\frac{1}{4}…
Nov 29, 2025
Zhaose
Renormalization of scalar propagator in a toy model
physics
QFT
Consider a mass-full scalar field
\phi
coupling with a mass-less scalar field
\chi
, the toy model’s total Lagrangian can be written as:
\mathcal{L}_B = \partial_\mu \phi^*…
Oct 21, 2025
Zhaose
Born approximation from path integral
physics
QM
Born approximation is one of the most well-known perturbation method for calculating quantum scattering processes in quantum mechanics. The transition matrix can be written…
Jul 31, 2025
Zhaose
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