Recent content by PreposterousUniverse

Thank you for your elaborate answer! Will be pondering about this.

But what happens if we consider only circular orbits? Then we have the relation E=L^2/(2m^2)

Could you give an example of this?

The quantum number n determines the energy, and for each n the allowed values for the angular momentum quantum number are -(n-1),...,(n-1). This doesn't seem resonable to me. Classically increasing the orbital angular momentum will result in an increase in the energy of the system. But why is it...

"Second, it suggests that quantum mechanics can be thought of as a local theory, because the Einstein–Podolsky–Rosen (EPR) criterion of reality can be rejected." From Wikipedia Quantum_Bayesianism So supposedly, they claim QBism to be a local theory and at the same time claiming that the...

Quantum Bayesianism takes the view that the there are no quantum states in the objective sense and that the probabilities should only be interpreted as what information an agent has about the system. Isn't this the same as claiming that there are hidden variables, and that probabilities arises...

I know of Bell's theorem. Kochen-Specker theorem is supposed to be a complement to Bell's theorem. I tried to understand it by reading the Wikipedia article. But I couldn't fully grasp the essential feature of this theorem, in what way it complements Bell's theorem. What are the main...

But wouldn't such a casual loop violate the principle of conservation of information? If the information has no source?

General relativity permits some exact solutions that allow for time travel. Some of these exact solutions describe universes that contain closed timlike curves, or world lines that lead back to the same point in spacetime. I wondered if these solutions also permits Causal loops? Such as the one...

How do one derive the relation E=hf?

Then why are infrared light, visible light and microwaves less energetic than gamma rays, X-rays, and ultraviolet light?

The energy of an electromagnetic wave does not depend on the frequency of the wave, only on the amplitude. Then why is light with higher frequency more energetic than light with lower frequency?

In the book Quantum Field Theory for the Gifted Amateur, they define the functional derivative as: $$ \frac{\delta F}{\delta f(x))} = \lim_{\epsilon\to 0} \frac{F[f(x') + \delta(x'-x)) ] - F[ f(x') ]}{\epsilon} $$ Why do they use the delta function and not some other arbitrary function?

Actually, I think it should be proportional to some symmetrized product of kronecker deltas. But how can one show that?

Anyone have any idea how to perform the following two integrals? ##\int d\Omega n_{i}n_{j}## and ##\int d\Omega n_{i}n_{j}n_{k}n_{l}## where the n is a unit vector.