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Thnx for your comment, DaTario! The "kinematics" of QM per quantum information theory is its Hilbert space structure. For example, the...

These are deep issues not usually tackled at the undergrad level. I am currently reading a book that tackles them...

If no theories in the direction I have mentioned have been explored in response to the OP’s question, please excuse my oversight.

What theory are you talking about?

No. You can do QFT in flat or curved spacetime.

Only in the sense that QFT gives a mechanism for computing probabilities that doesn't have the collapse postulate the way ordinary...

You don't need to "master" relativity. You just need to understand that one of the lessons relativity teaches us is that physics is...

That's correct. What you are calling "ordinary" QM is a non-relativistic approximation. For relativistically correct QM, you need...

You're certainly not the only one. :wink:

That's correct. Not really. See below. Yes, but what that means is not that "you can think of the wave function collapsing either...

You may conclude that that statement, as you make it, is not even well-defined. You didn't specify a time in any frame at which B has...

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Note that any point on the unit circle has coordinates ##(\cos \theta, \sin \theta)##. This is perhaps the simplest way to define sine...

People dont use the unit circle for these kinds of problems instead they use trig identities to reduce it.

No. You have a system consisting of a particle and a measuring device. That's true regardless of what outcome you measure. The sentence...