Roberto Pavani's latest activity

I was just highlighting a passage from the paper linked by @bhobba. My understanding is that in the Heisenberg picture, the operators...

Yes, that's correct. A question was asked about global causal structure and black holes. That's relevant to the QFT viewpoint on...

Because, in some contexts, a black hole is also treated as a quantum system with S degrees of freedom, where S is proportional to the...

Can you provide his full argument? Energy and torque are different things, and a system can be isolated against one but not the other...

For the car: your front is "lifted" and your rear is "lowered" under acceleration (think of motorcycles doing wheelies), that's the...

https://arxiv.org/pdf/quant-ph/9906007 the interesting pdf linked by @bhobba at page 22

Interesting the chapter 8, page 22: "8. ‘Nonlocality’ of the Schrödinger picture Given that quantum theory is entirely local when...

Thanks, Peter, you are, of course, right. I need to check the references. Added later. The following paper indicates a subtle...

indeed, no undergraduate answer for this

I thought that a global causal structure requires no singularities (e.g. no BH). Am I wrong?

Are you implying a block universe picture (where the field exists as a complete 4D object and the question of FTL propagation doesn't...

Corollary: since ice forms asymmetrically inside the bottle, it also expands asymmetrically. As noted by @Jonathan Scott, when a plastic...

I'd be fairly sure that the lower temperature caused the air pressure to decrease in the bottle, and that caused the sides of the bottle...

If I were observing volume changes of a plastic bottle, I would, measure the mass before and after by placing the bottle on a kitchen...

When a plastic bottle collapses in one direction, it gets larger in another, creating an elliptical cross section or even more crumpled...