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Tian
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- TL;DR Summary
- I want to calculate photon selfenergy in the finite temperature field theory (real -time). There are two delta function. There may be some wrong in my calculation ,but I can not find it
Photon self-energy is a concept in quantum field theory that describes the interactions between photons and other particles in a system at a finite temperature. It is a measure of how the energy of a photon changes due to its interactions with other particles in the system.
In real-time calculations, photon self-energy is typically calculated using a technique called the Feynman diagram approach. This involves representing the interactions between particles using diagrams and using mathematical equations to calculate the resulting self-energy.
Photon self-energy is important in understanding the behavior of particles in a system at a finite temperature. It can affect the properties of particles, such as their mass and energy, and can also influence the dynamics of the system as a whole.
At higher temperatures, the interactions between particles in a system become more frequent and intense, leading to a greater impact on the self-energy of photons. As a result, the self-energy of photons can change significantly at different temperatures.
Yes, photon self-energy can be indirectly measured through experiments that observe the properties of particles in a system. By comparing the predicted values of self-energy with experimental data, scientists can validate the theories and calculations used to describe finite temperature field theory.