Understanding the Nature of the Electromagnetic Field: One or Many?

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SUMMARY

The discussion centers on the nature of electromagnetic (EM) fields, specifically whether they are singular or multiple entities. Participants clarify that modern physics recognizes the zero-point energy as fluctuations within a singular EM field, which can exist independently of charges. This understanding aligns with Maxwell's equations, which describe both vacuum solutions (EM waves) and non-vacuum solutions. Ultimately, the consensus is that there is one electromagnetic field that manifests in various forms based on the presence of charges and currents.

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  • Understanding of Maxwell's equations
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  • Knowledge of zero-point energy concepts
  • Basic principles of classical physics
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csmcmillion
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When I studied EM we always treated EM fields as being "individual" autonomous fields generated either from the separation of charges or induced by other phenomena. However, I'm reading that modern physics is treating the zero-point energy as fluctuations in THE EM field. Susskind clearly states that this EM field exists absent any charges, and is simple a characteristic of empty space.

Am I missing something here?
 
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I think you are reading way too much into a preposition. It is possible to have electric and magnetic fields in the absence of charges. These are known as vacuum solutions to Maxwells equations, and take the form of EM waves. Whether you use one preposition for vacuum solutions and another preposition for non-vacuum solutions is not terribly important.
 
Even in classical physics there's one and only one electromagnetic field (according to Maxwell's theory as a classical relativistic field theory). This field can have many specific forms dependent on the charges and currents.
 

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