A question on Virtual Photons, and QED

In summary, the conversation discusses the role of virtual photons and virtual particles in explaining the electromagnetic field and the possibility of virtual gravitons in understanding the gravitational force. There is uncertainty about whether the gravitational field allows for second quantization and further research is needed to fully understand these concepts.
  • #1
mattthecat
5
0
Quantum Electro Dynamics, the quantum theory of the photon, describes the photons interaction with electrons and this is what I beleived created the electromagnetic field. However recently I've heard a disscusion that virtual photons and their interaction with electrons and the polarization of virtual particles conveys electromagnetism, in fact it was said that virtual particles communicate all the forces through spacetime, but this doesn't sound right in gravity's case. I want to know if this is true, and if anyone can shed some light on this topic, thanks.
 
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  • #2
Many people believe that the gravitational force is due to the exchange of virtual gravitons, but gravitons have never been found. So far, we don't even know whether the gravitational field admits second quantization.
 

FAQ: A question on Virtual Photons, and QED

1. What are virtual photons in the context of quantum electrodynamics (QED)?

Virtual photons are particles that are not directly observable, but play a crucial role in the theory of QED. They are the force carriers of the electromagnetic force, and are responsible for interactions between charged particles.

2. How do virtual photons differ from real photons?

Virtual photons differ from real photons in a few key ways. Real photons have mass and can be directly observed, while virtual photons have no mass and cannot be directly observed. Additionally, real photons travel at the speed of light, while virtual photons do not.

3. What is the significance of virtual photons in QED?

Virtual photons play a crucial role in the theory of QED as they mediate the interactions between charged particles. This theory has been successful in accurately describing and predicting the behavior of electromagnetic interactions at the quantum level.

4. Can virtual photons be detected in experiments?

No, virtual photons cannot be directly detected in experiments. This is because they have no mass and do not travel at the speed of light, making them impossible to observe. However, their effects can be observed through the interactions they mediate between charged particles.

5. Are virtual photons just theoretical constructs or do they have physical significance?

Virtual photons may be considered theoretical constructs as they cannot be directly observed. However, they have physical significance in the sense that they play a crucial role in the theory of QED and have been successfully used to explain and predict various electromagnetic phenomena at the quantum level.

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