Are Fields Real or Just Ad Hoc in Science?

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Discussion Overview

The discussion revolves around the nature of electric and magnetic fields, questioning whether they are real entities or merely mathematical constructs. Participants explore the implications of fields in scientific frameworks, touching on philosophical considerations and the utility of fields in describing physical phenomena.

Discussion Character

  • Debate/contested
  • Conceptual clarification
  • Philosophical inquiry

Main Points Raised

  • Some participants argue that fields should be considered real because they are assigned physical quantities like energy and momentum.
  • Others suggest that the usefulness of fields in describing phenomena is more important than their ontological status.
  • A participant questions the definition of "real" in this context, implying that it may be subjective and tied to whether fields provide insight.
  • Another participant challenges the notion that "real" should be defined by its ability to provide insight, suggesting that this definition is odd and not universally applicable.
  • One participant emphasizes that while fields may seem ad-hoc, they enable the construction of powerful mathematical frameworks that effectively predict complex behaviors.
  • A later reply reflects on the inherent ad-hoc nature of scientific theories, questioning why certain mathematical forms are chosen over others, such as the specific exponent in Newton's law of gravitation.

Areas of Agreement / Disagreement

Participants express differing views on the reality of fields, with no consensus reached. The discussion remains unresolved, with multiple competing perspectives on the nature and significance of fields in science.

Contextual Notes

The discussion highlights the philosophical complexities surrounding the concept of "real" in scientific contexts and the subjective nature of insight. It also points to the inherent ad-hoc nature of scientific theories without resolving specific definitions or implications.

Yashbhatt
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Are electric and magnetic fields real or are they just mathematical manipulations? Of course, one could say that we do not care about whether they are real or not, the only thing which matters is that they are useful in describing various things.

But we assign quantities like energy, momentum to fields. So, shouldn't they be real if they have all these properties?
 
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Yashbhatt said:
Are electric and magnetic fields real or are they just mathematical manipulations? Of course, one could say that we do not care about whether they are real or not, the only thing which matters is that they are useful in describing various things.

But we assign quantities like energy, momentum to fields. So, shouldn't they be real if they have all these properties?
Do you have a radio in your car?
 
fresh_42 said:
Do you have a radio in your car?
Yes.
 
Yashbhatt said:
Yes.
And the radio program is transmitted by electromagnetic fields. Therefore they are as real as the music is played on the radio.
 
Yashbhatt said:
Are electric and magnetic fields real or are they just mathematical manipulations?

How would you tell the difference? That is, what exactly does "real" mean to you?
 
jtbell said:
How would you tell the difference? That is, what exactly does "real" mean to you?
Well, that would be difficult to define. But the problem I have is the concept of fields somehow seems too ad-hoc. It doesn't provide insight.
 
So you're defining "real" as "provides insight to you"? That seems like an odd definition, and not one I would use, but by that definition, no, they are not real.
 
This is a purely philosophical question. Choose the answer you like.

Thread closed.
 
Yashbhatt said:
Well, that would be difficult to define. But the problem I have is the concept of fields somehow seems too ad-hoc. It doesn't provide insight.
It does, however, allow us to construct powerful and general mathematical frameworks that do an extraordinarily good job of predicting the behavior of extraordinarily complex systems (It may be amazing that your car radio work, but nowhere near as amazing as that the person who designed it could reasonably expect that it would work while the design was still on paper). That's about as good as it gets in science.

"Ad hoc" in the sense that you're using it is inherent in all science. We choose theories and mathematical frameworks because they match the behavior of the universe around us, and that's an ad hoc procedure. When Newton chose to formulate his law of gravitation, why did he put an ##r^2## in the denominator instead of an ##r^3##? What is so special about 2 other than that it happens to work?
 

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