Recent content by Nuno Amiar

I'm portuguese. We put junkies in rehab basically. It's better than sending them to prison where there are still drugs around, does not solve the problem, costs more money, and when the sentence is over, they are back into society with the same problems, maybe even in worse conditions. We have...

Thank dog I am not the only who noticed this. I was about to delete my account from this forum.

Me neither. I was just surprised how could someone question GR from this, supposed legit experiment, without proposing a simpler explanation without having to take into account the spacetime fabric.

Ok I have a very simple explanation for this phenomena. My assumption is that when we are expecting a certain sensory input, it is natural for the brain to anticipate it (ever played soccer and noticed that you close your eyes before the ball actually hits you in the head?), thus the results of...

You won't find any derivation for the quantum momentum as a consequence of translation symmetry of space in the Griffiths Introduction to Quantum Mechanics I believe.

Introduction to Quantum Mechanics, David Jeffrey Griffiths, page 14. While it might not be the best description, it suffices to answer if you are new to QM. Take the mean value of X, and differentiate it in order to time. Multiply by the mass of the particle. Now look at what you get inside the...

That would have something to do with the basis of the space spawned by an operator A sharing the same eigenvectors of another operator B. If they share a common vector base then the state of the system is fully described in both basis at the same time. Otherwise this cannot be true. But that is...

It's not the same, it is quite the opposite. Because A,B do not commute, you cannot know both to arbitrary precision.

Yes. Let \hat{A},\hat{B} two operators representing two different observables and let \sigmaA,\sigmaB be the respective standart deviations, then the HUP states that IF \hat{A} and \hat{B} do not commute then the product \sigmaA\sigmaB is always greater than the square of the (minus halve)...

Thanks for the clarification. It makes sense that the principal should be viewed as a statistical implication and the problem I was thinking, to be both valid in classical and quantum physics. Is there any known connection? I thought one of the postulates was to relate the eigenvalues of...

I am not conjecturing. I am simply stating that the act of observing (measuring) is such that it happens all the time around us.

So, it is possible with a single experiment to measure both position and momentum arbitarly? Can anyone point to me such apparatus or thought experiment.

Thanks for the fast response. This makes the whole topic a lot more interesting. I haven't grasped the slightest yet about QM. I still have to figure out why I'm wrong though. I thought the whole concept of the wave collapse was if you have a system made of superpositioned states that by...

But isn't there a colapse of the wave fuction upon passing the single slit (measurement) which changes the shape and distribution of momentum?

That put a smile on my face. I'm new to this physics jokes :p I have a question, so please do correct my reasoning. Is ZapperZ suggesting that I could in theory arrange a system where I could know both position and momentum with infinite precision at the same time? If not, how should we...