What is the Mass of Photons According to QFT?

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SUMMARY

According to Quantum Field Theory (QFT), fundamental particles, including photons, are excitations of their respective fields. The photon corresponds to an oscillation of the electromagnetic (EM) field. While energy is required to excite this field, leading to the assertion that photons should possess mass, the relationship is nuanced and requires further exploration of the incompleteness of E=mc². The discussion emphasizes the complexity of mass and energy in the context of QFT.

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FallenApple
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So according to QFT, fundamental particles are just excitations in their underlying fields.

So the photon would correspond to an oscillation of the EM field.

But it takes energy to excite this field. And E=mc^2. So therefore the photon should have some mass. Energy was put into create it. That energy has to be concentrated somewhere.
 
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