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visits member for 2 years, 11 months
seen Jun 29 at 5:18

Apr
11
comment Why does Principle for least action hold for classical fields
@Qmechanic The question I'm asking here is very different from those two questions. I'm not asking why motion of a particle follows the principle of least action, which comes from the Newton's laws. My question is for classical field theory like EM and gravitational field. One obvious answer is Newton's gravity law and Maxwell eqns imply the the principle of least action. But the fact that both of these field theories satisfy the least action principle, does that mean there is something deeper going around? Is it the particular of these laws which frorce them to satisfy the least action.
Aug
27
comment Does every hermitian operator represent a measurable quantity?
What is the precise definition of the term observable? How do you know a hermitian operator is observable or not?
Apr
4
comment Does the observer or the camera collapse the wave function in the double slit experiment?
I think your question is what isdefinition of measurement in quantum mechanics or equivalently when does a "wavefunction" collapse happen? For this you can read this article en.wikipedia.org/wiki/Measurement_in_quantum_mechanics Though I don't think there is any universally accepted definition of measurment in QM.See my edited amswer.
Apr
1
comment How deep can my knowledge of particle physics go without the maths?
To understand paricle physics, you need knowledge of group representation theory and Lie groups.
Mar
30
comment How electrons act under rotating magnetic field?
The behaviour of an electron is determined by the laws of quantum mechanics not classical mechanics. An electron may not have definite position or momenum. Also. eletrons don't rotate around the nucleus in classical orbits.
Mar
30
comment What does the Copenhagen interpretation say about the position of a particle before measurement?
A number of physicists have criticized the Afshar's interpretation of his results. They don't believe his experiments voilate the complementarity principle.I guess there is a lot of confusion regarding this.
Mar
30
comment What does the Copenhagen interpretation say about the position of a particle before measurement?
@annav This is from Quantum Mechanics and Path integrals by Feynman "We shall state the uncertainity principle as follows:Any determination of the alternative taken by a process capable of following more than one alternative destroys the interference between the alternatives". So, if we can determine through which slit electron passed and still retain the interference, we are violating the hiesenberg uncertainity principle according to Feynman. So the hiesenberg uncertainity principle has been experimentally violated? Am I missing something here?
Mar
30
comment Are there theories that explain wave-particle duality?
@Outlier There is no answer to your question. Your question is like asking why does gravitation varies inversely to the square of the distance. This is fundamental law of nature just like the wave-particle duality. We don't know why nature works the way it is.
Mar
29
comment What does the Copenhagen interpretation say about the position of a particle before measurement?
@annav Can't a quantum die (a quantum system with six states) exists as a supperpostion of more than one state?
Mar
29
comment Derivation of $ E=h\nu$
But what does a harmonic oscillator has to do with a photon?
Mar
28
comment Derivation of $ E=h\nu$
ok. so can it be derived from any other set of elementary principles or axioms?
Jan
27
comment A hot object exposed to low temperature in a vacuum doesn't lose heat?
Well, "heat" is not radiation. But a body tranfers "heat" as radiation.
Jan
13
comment Quantum superposition of states: experimental verification
So, the reason why macroscopic objects like pen can't be in superposition of different because of decoherence. But will it be ever possible to "remove" decoherence and demonstrate the quantum of superposition of large objects?