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Fields are the fundamental principles in QFT but you can start with a Lagrangian who describes a certain model and say "cool, those are the fields that exist physically". But then you can write another Lagrangian, maybe even contain the same fields, which describes the same physics. One of the most radical examples is 1 + 1D bosonization. You start with a theory that contains only fermions and ends with a theory containing only bosons. Totally equivalent to each other. Out of a bosonization is just a 2D trick. And the models of bosonization in more dimensions are punctual models. In 2D you can always do. In extra dimensions depends on the symmetry of the fields and the model itself. We have a model toy and through a transformation you change from bosons to fermions. Does not proceed ... it's all toy model. You can not know what is most fundamental. Or original. The question of bosonization also relates to integrability. There are 2D models that are integrable. That is, it is not possible to distinguish what is most fundamental. How is this possible if the fields are fundamental?

first of all, hi, how are you? I was watching the Flash series when in a certain episode appears two villans, one with a radius that reaches the absolute zero (-273,15 °C) and another that reaches Planck temperature a(141 X 10³⁰ °C) the series said that one cancel the other, but we all here know that is wrong, but really, what will happend if this two radius touch one another, and what will happend if an ray at absolute zero touch an body? and if an ray with Planck temperature? I´m waiting thanks (sorry for the bad english, I'm brazillian

First, Good night. I Was reading the physics of the future (which is an incredible book and I recommend it) and I saw some possible solutions for global heating,but all of then has an conter argument. So I google it, and guess what? It didn't find it, so anyone can help me? I would be grateful. ^-^ (Sorry for the bad english, Im brazillian)

then say to us lepton!!!;)sorry for the english, I'm brazillian sorry, its enochulus(note: i want to know!!!)