Is the Electromagnetic Field Omnipresent Throughout the Universe?

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The electromagnetic (EM) field is considered to exist throughout all of space-time, according to quantum field theory, which underpins the standard model of particle physics. Photons are described as excitations of this field, but they do not create or emit an EM field since they lack electric charge. The discussion highlights the omnipresence of photons, referencing phenomena like the cosmic microwave background. The idea of rephrasing the discussion to focus on the existence and excitation of the EM field was suggested. Overall, the consensus leans towards the EM field being a fundamental aspect of the universe.
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To keep it simpler let take the electromagnetic (EM) field.

A photon, in one perspective, can be described as an excitation of the EM field.



Is the EM field omnipresent in all (time-space) the universe?

or

Does the photon creates/emit an EM field around it?
 
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San K said:
To keep it simpler let take the electromagnetic (EM) field.

A photon, in one perspective, can be described as an excitation of the EM field.



Is the EM field omnipresent in all (time-space) the universe?

or

Does the photon creates/emit an EM field around it?

I would say the electromagnetic field (or more precisel, the electromagnetic potential field) exists in all space-time. This is the usual quantum field theory theoretical basis (not only for photons, but all particles too) which is used to construct the standard model. Also, a photon cannot 'create' an EM field as it has no electric charge.
 
Hi San K! :smile:
San K said:
To Is the EM field omnipresent in all (time-space) the universe?

Photons are everywhere anyway!

(eg the cosmic microwave background :wink:)
 
If you change the title to existing and excited. Voila
 
Thanks Kevin, tiny-tim and RGauld.

Lol RGauld...good idea.
 

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