Are quantum field only calculation tools?

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Discussion Overview

The discussion centers on the ontological status of quantum fields in quantum field theory (QFT), questioning whether they possess an independent reality or function solely as mathematical tools for calculations. The scope includes theoretical implications, interpretations of quantum mechanics, and philosophical considerations regarding the nature of particles and fields.

Discussion Character

  • Debate/contested
  • Conceptual clarification
  • Meta-discussion

Main Points Raised

  • Some participants assert that quantum fields are merely calculational tools, similar to virtual particles, and express skepticism about their ontological reality.
  • One participant references a "shut-up-and-calculate" approach prevalent in QFT, noting its practical success but questioning its philosophical implications.
  • A participant introduces a thermal interpretation that assigns ontological status to expectation values of quantum fields, suggesting a different perspective on their reality.
  • There is a suggestion that the notion of particles being merely manifestations of fields is still a conjecture, leaving open the possibility that particles could be primary and fields secondary or nonexistent.
  • A participant discusses the Copenhagen Interpretation, proposing that interference patterns may exist only in mathematical equations without physical counterparts, and seeks examples of similar phenomena in physics.
  • Another participant aligns with the view that quantum fields are primarily calculation tools, reinforcing the debate on their ontological status.

Areas of Agreement / Disagreement

Participants express differing views on the ontological status of quantum fields, with some advocating for their role as calculational tools and others proposing alternative interpretations. The discussion remains unresolved, with multiple competing perspectives present.

Contextual Notes

Limitations include the lack of consensus on the nature of quantum fields and the dependence on various interpretations of quantum mechanics, which may influence participants' views.

Varon
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Do quantum field have ontological reality or are they only mathematical calculational tools just like virtual particles? What's the mainstream consensus?
 
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Varon said:
Do quantum field have ontological reality or are they only mathematical calculational tools just like virtual particles? What's the mainstream consensus?

The main stream consensus in QFT is shut-up-and-calculate. This really works well in practice, but does not give a good intuition about reality.

My thermal interpretation discussed in https://www.physicsforums.com/showthread.php?t=490492 is not yet mainstream but gives the expectation values of a quantum field (not the quantum field itself) the ontological status of beables.
 
Varon said:
Do quantum field have ontological reality or are they only mathematical calculational tools just like virtual particles? What's the mainstream consensus?

In my personal opinion, quantum fields are "calculational tools". Here I disagree with Dr. Neumaier. Please visit thread https://www.physicsforums.com/showthread.php?t=474666 . It can help you make your own mind.

Eugene.
 
So the statement particles being just momentum and energy of the field is just a conjecture? Meaning someday it is still possible particles are primary and field is secondary or nonexistent?
 
Varon said:
So the statement particles being just momentum and energy of the field is just a conjecture? Meaning someday it is still possible particles are primary and field is secondary or nonexistent?

In my opinion, this is a valid statement, which should be seriously discussed.

Eugene.
 
In Copenhagen. It is said that what is interfering is only in the equation. Meaning in the inteference pattern, you can see the pattern but it doesn't prove the particles are physical interfering. This is the essence of the Copenhagen Interpretation.

Now is there other examples in physics where the dynamics only occur in the equations and there is nothing that physically happens? I can think one now.. virtual particles being just mathematical artifacts and not physical there at all. What else?

But for double slit. Does it makes sense the interference is only in the equation and not really there physically? Perhaps Copenhagen is popular is because there are many examples in physics where things only occur in the equations and not physically? Pls. cite other examples so we can appreciate Copenhagen better.
 

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