logoalt Hacker News

elashri10/12/20241 replyview on HN

My point was that sabine is claiming that the field is dying (or in a crisis). You can argue against string theory and quantum gravity research as much as you want. But this will not warrant sabine's conclusions about particle physics and why we should invest in other areas instead. She is doing this for almost a decade now.

And I don't understand your point about statistical interpretation and how it is related to being a religion. Pick up any of the mainstream interpretation and start doing calculations of lets say ground state energy of H atom and you will get the same results.

All mainstream interpretations yields the same results if calculations are done "correctly". The shut up and calculate works pretty well across interpretation because of two things you have to consider

The first thing is that all interpretations rely on four things to be able to do the calculations. ( I simplified a little bit)

1- Hilbert spaces to represent quantum states

2- Operators for observables (like momentum and energy)

3- Unitary evolution of states through the Schrödinger equation

4- Born’s rule for calculating probabilities of measurement outcomes

Thus, the underlying equations are the same regardless of interpretation.

The second thing you have to understand the role of Interpretations. They aim to explain what the mathematical structure of QM means. They differ on issues like: collapse, Is it real (Copenhagen)? just an apparent phenomenon (Many-Worlds)? or governed by additional variables (Bohmian mechanics) or the question of Determinism. Is the universe fundamentally deterministic (Bohmian mechanics)? or indeterministic (Copenhagen)?

The last thing is a really philosophical question about what exists physically—wavefunctions, particles, or multiple worlds?

These philosophical questions don’t affect the numerical predictions of quantum theory and that's part of the reason you shouldn't learn physics from science communication books.


Replies

randomNumber710/12/2024

Thank you for the reply. I absolutely agree, but it's not only science communication and journalists that try to see it in a philosophical way.

Roger Penrose for example (as far as i can tell a highly respected physicist) is arguing that the collapse of the wave function happens inside the brain and enables our consiciousness.

Who am I to criticise that? I think we should be open to anything in science. On the other hand when one tries to do philosophy, one should also understand the field. For an outsider it looks like people try to flatter themselves with their superior mathematical skills.