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bio website motls.blogspot.com
location Czech Republic
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visits member for 3 years, 7 months
seen 15 mins ago

Hi, I am a string theorist and a publicist.


14m
comment Feynman Lectures: Trigonometry Error in Rotational Dynamics?
Yes, that's very right that you're used to that notation. But Feynman's talk is supposed to be directed even to undergraduates who haven't heard of calculus, or at least who haven't internalized it, so he's just "emulating" much of the wisdom of the calculus without the modern notation for derivatives and infinitesimals.
32m
answered Feynman Lectures: Trigonometry Error in Rotational Dynamics?
52m
awarded  Good Answer
4h
answered How can I boost the FM reception of a smartphone?
2d
comment Classical probability explanation for quantum non-locality and Bell's inequality?
If you are saying that the classical Malus' law is enough to calculate the absorption by polarizers, then it's because the classical Malus' law is mathematically identical to the probailities for 1 photon in QM - and that's because the classical law is actually an emergent consequence of the quantum law when the same absorption rate is applied to many photons in the same state.
2d
comment Classical probability explanation for quantum non-locality and Bell's inequality?
If you claim that you have a classical local model that gives the same correlations, then you are wrong. It is not possible. If you are manipulating with the probabilities computed from QM and see that the manipulations are consistent with classical probabilities, they are because there's nothing such as "classical and quantum probabilities". The concept of "probability" means exactly the same thing in quantum mechanics - it's just being differently, more directly, calculated.
2d
revised Can we have discontinuous wavefunctions in the Infinite Square well?
edited body
2d
comment What is the motivation for the definition of a manifold?
No but every theorem about manifolds does.
Aug
17
answered What is the motivation for the definition of a manifold?
Aug
16
awarded  temperature
Aug
15
answered How is CMB related to the temperature of the universe
Aug
15
revised Dimensionless Constants in Physics
added 47 characters in body
Aug
14
comment Glashow-Weinberg-Salam mass terms
You've copied the error of missing $i$ in front of $W^2_\mu$, didn't you?
Aug
14
comment Must length equal distance?
Apologies, user, I don't understand these thoughts of yours. You are doubtful about some aspect of the notion of "distance" or "length" that others probably find obvious, and I don't know what it exactly is.
Aug
14
comment Reduced mass and harmonic mean
An underlying reason/explanation for a mathematical claim - like any claim about harmonic averages - is ultimately mathematical. So the "mathematical deduction" and the "underlying reason" is really the same thing. Of course it's no coincidence that the reduced mass is proportional to the harmonic average.
Aug
14
answered How does a structureless particle decay?
Aug
14
answered Why aren't all large stars black holes?
Aug
14
awarded  operators
Aug
13
comment What is the status of massless photons traveling through a medium?
You surely don't mean a pure state in the sense of an element of the Hilbert space, do you? Every physical system may be in a pure state. A pure state is the right description whenever our information about the system is maximized one allowed by the uncertainty principle.
Aug
13
awarded  group-theory