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1d
comment Speed of gravity within a mass
Does this mean that refraction of gravitational waves by matter is also not detectable?
Feb
8
comment What is the opposite of quantization?
@CuriousOne: Why do you not write another answer then?
Feb
8
comment What is the opposite of quantization?
Bohr said, that the angular momentum should be multiples of Planck's constant: $L = n\hbar$. So if $L$ is taken as a constant taking the quantum number $n \rightarrow \infty$ basically implies $\hbar \rightarrow 0$ . Doesn't that mean that both statements are basically equivalent?
Feb
7
asked What is the opposite of quantization?
Feb
7
accepted Is the polarization of light changed by gravity?
Feb
7
comment What is the point of complex fields in classical field theory?
That you for the link to the notes of Sidney Coleman. These are really helpful.
Feb
7
accepted What is the point of complex fields in classical field theory?
Feb
7
comment What is polarisation, spin, helicity, chirality and parity?
What about polarization?
Feb
7
comment Does a set of eigenvalues in QM correspond to a random variable in statistics?
Sorry, I overlooked this clear statement in the wall of text by Moretti: "As a matter of fact, a maximal set of pairwise commuting projectors has formal properties identical to those of classical logic: is a Boolean σ-algebra."
Feb
6
comment Does a set of eigenvalues in QM correspond to a random variable in statistics?
But ValterMoretti is talking about measurements of two observables (which as I understand don't commute in QM in general). That is not what I'm asking about. My question is much simpler and only concerns the measurement of a single observable.
Feb
6
comment Does a set of eigenvalues in QM correspond to a random variable in statistics?
The term "eigenvalue" does not appear in the answer of ValterMoretti you link to, so I think my question is different.
Feb
6
asked Does a set of eigenvalues in QM correspond to a random variable in statistics?
Feb
1
comment Is what statisticians call a “random variable” what physicists call an “observable” in QM?
Terence Tao seems to share my view "...and quantum mechanics (with physical observables taking the role of random variables, and their expected value on a given quantum state being the expectation)" (terrytao.wordpress.com/2010/02/10/245a-notes-5-free-probability)
Feb
1
comment Is what statisticians call a “random variable” what physicists call an “observable” in QM?
That is interesting. Can you put your statement about four tuples of binary random variables into a mathematical form?
Jan
31
asked Is what statisticians call a “random variable” what physicists call an “observable” in QM?
Jan
29
comment What is the point of complex fields in classical field theory?
@Numrok But isn't a set of two real scalars a vector? The two scalars also have the same units and it is often said, that complex numbers can be represented as vectors.
Jan
29
comment What is the point of complex fields in classical field theory?
@Numrok I'm not sure about that point, too. The idea is that a complex number is by definition a en.wikipedia.org/wiki/Scalar_(physics) quantity, so invariant under coordinate transformation. But a vector of two real quantities is not a scalar. So it is not invariant under coordinate transformations.
Jan
29
asked Is the polarization of light changed by gravity?
Jan
29
accepted Why is the Fourier transform more useful than the Hartley transform in physics?
Jan
29
asked What is polarisation, spin, helicity, chirality and parity?