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8

The Born rule (and hence any discussion of collapse in the sense of the Copenhagen interpretation) is relevant only when an observer has made a distinction between a (tiny, observed) system and its (huge, observing) environment (= everything else, containing in particular the measurement equipment). This distinction (not present in relativistic QFT itself) ...

1

There exists such theory that does what you said (no localism but realism), known as Bohmian quantum mechanics. (The theory even remains local causal, which is required by relativity theory.) You may want to check out the wikipedia section (https://en.wikipedia.org/wiki/Hidden_variable_theory#Bohm.27s_hidden_variable_theory) or Plato site ...

4

I take a minimal interpretation of QFT in a Copenhagen style to seek to make a connection between a classical description of/model for an experimental apparatus and classical records of its measurement results and a QFT model for the same apparatus. Classically, a modern measurement device is most often a thermodynamically metastable system that we engineer ...

1

Laws present to us what we know (what we may know). There two meanings of the word law. One is the description scientists make of the regularities of observations. The other is the actual regularity which is postulated. But what we know cannot define what is real; it only defines our actions & assumptions. The above sounds like a completely ...

-3

Is the many-worlds interpretation (MWI) of QM inconsistent with quantum field theory? I think it is. Quantum field theory starts with QED, where the photon is described as as an excitation of the photon field, and the electron is described as an excitation of the electron field. This is compatible with weak measurement, classical electromagnetism and ...

8

You can trivially apply MWI to QFT, so just do it and ignore nay sayers. Or if you want to talk to them, then the burden is on them to argue why you can't do something that you are literally doing. After all, it is just too hard to predict what imaginary concerns they have. Now, in your case a specific concern was listed: Because in QFT time is ...

0

The answer by @urdv gives the mathematics of destructive interference in the classical framework. The classical framework emerges from the quantum mechanical framework smoothly, the individual photons that build up the classical wave follow in bulk the classical Maxwell equation solutions of classical electromagnetic fields because their wavefunctions are ...

0

The disappearing interference lines can also be well understood as typical 4-slit optical interference. Let $D$ be the distance from the slits to the screen and $d$ the separation between 2 adjacent slits. The intensity pattern on the screen is then a function $I(x)$ of the on-screen position $x$ as shown in the figure below: To see why some lines go ...

2

I see now that your question is about the interpretation. Well, the interpretation is that you now integrate over the space of all fields in momentum space. Of course, mathematically the region of integration is still the space of functions $\mathbb{R}^4\to\mathbb{R}$ (or whatever kind of field applies) and so the meaning of $\mathcal{D}\phi$ is more or less ...

4

Yes, your interpretation is correct, but only if the probabilistic nature of these events is caused by quantum mechanics. To give a counterexample. If you throw a die,the probability of throwing six is around 16.6 %. However in this case there is no splitting of worlds. The reason is that in this case the uncertainty in the outcome is a result of an ...

5

Indeed, it could be helpful conceptually if textbooks also mention the pilot wave theory of de Broglie and Bohm, which provides an example of how particles being guided by interfering waves can lead to interference patterns in the statistical distribution of particle positions. The experiments by Couder on droplets "walking" on water, which you mention, ...

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