[jerf]

You don't have to wonder, because they are. They're manifestations of fields.

I think it is a reasonable answer to tell people "if you're looking for the short list of simplest things, the number of types of fields there are is probably what you're looking for".

That doesn't invalidate this question in general, though the number of different answers from people looking at the same thing suggests it may be underspecified.

[HarHarVeryFunny]

But of course one can then question why are there exactly N different types of fields, with their specific types of interaction (at least in our universe)? Why should we suppose that this is the most fundamental description of reality, rather than being emergent from something else?

[tsimionescu]

Well, why would there be fewer than N? There is no general principle that we can impose on the world, it just is, we can only discover what the laws and components of the world are (hopefully). I'm not claiming it's impossible for there to be fewer fields than we think right now. But there is no reason to believe there should be.

[rwmj]

To me that raises the opposite question, why are there so few fields? (Compared to what I'd imagine, infinite)

[Edit: I suppose I'm imagining waves or frequencies of waves, rather than fields, hence why in my imagination there would be an infinite variety]

[Filligree]

Not all fields interact with all other fields. You can think of them as a loosely coupled graph…

There might be any number of graph components with no connectivity to our fields at all, and we’d never know. Assuming, of course, that we’re including gravity in this logic.

There’s also might be any number of arbitrarily complex components which are only connected through gravity. That’s a decent candidate for what the dark sector actually is.

[TheOtherHobbes]

In QFT every particle type has its own field.

[nine_k]

...and a field is just a value that behaves in a particular way. An example outside QFT: phonons [1] behave like particles, but there is no "palpable" sound field, there's only local distribution of implulses of the molecules of air (or whatever medium) where the sound propagates.

Other fields can be seen as attributes of the space itself, and "elementary particles" as wrinkles on it. Gravity is special because it bends the very geometry of space.

[1]: https://en.wikipedia.org/wiki/Phonon

[antonvs]

Every particle type has its own field, but the OP article is counting a single particle type multiple times based on properties like spin and polarization. At one point the article reaches the number 118. That corresponds directly to 37 quantum fields once you take the "double counting" into account.

[antonvs]

> if you're looking for the short list of simplest things, the number of types of fields there are is probably what you're looking for

Definitely. It's rather strange that the OP article doesn't even mention the word "field". It seems that people in general have a hard time letting go of the idea of particles as fundamental.

A good overview of this is "There are no particles, there are only fields" (https://arxiv.org/abs/1204.4616) by physics prof Art Hobson.

Fields collapse the zoo described in the article significantly, because particles and antiparticles arise from the same field, and similarly, spin, polarization, and helicity are properties of the same field. Taking this into account, the 118 particles number that the article reaches at one point drops to 37 fields.

[AnimalMuppet]

You've said that "37 fields" at least twice. It doesn't seem to come from the arxiv article you linked, though. And it seems rather high to me. (Of course, 118 seems ridiculously high...)

Anyway: Would you list them? Or supply a link to somewhere that does?

[Noaidi]

> They're manifestations of fields.

Or wave. Everything is a quantum wave.

https://www.vlatkovedral.com/everything-in-the-universe-is-a...

[GroksBarnacles]

A wave is already what we call a manifestation of a field, maybe I skimmed too quickly but I don't get the author's breakthrough point.

[Noaidi]

Yes, the field is the substrate.

"I insist upon the view that 'all is waves'."

    Letter to John Lighton Synge (9 November 1959), as quoted by Walter Moore in Schrödinger: Life and Thought (1989) ISBN 0521437679 

It is not a breakthrough, it is just something we refuse to see, something that was known for a century.

"All is a wave" is the unifying principle. I am no mathematician, but the math needs to start with that fundamental principle.

The very notion of calling it "qunatum" physics is probably wrong since quantum is "a discrete quantity of energy proportional in magnitude to the frequency of the radiation it represents."

And if everything is a wave there are no discrete quantities beyond our definition of what constitutes the end, or borders, of the wave.

[andrewflnr]

> Now, when I told my editor at Allen Lane about my own interpretation, he immediately said “It’s Many Worlds on steroids!” There is a grain of truth in that, ...

Dude, this is an answer to an entirely different question. He's proposing an interpretation of QM, which is independent from "how many fundamental particles".

[antonvs]

A wave is a phenomenon that propagates through a field - i.e. the field is what allows the wave to exist.

(The philosophy of that admittedly gets messy, though, e.g. "are fields real objects?")