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I am currently self-learning quantum mechanics with A Textbook of Quantum Mechanics Second Edition by P. M. Matthews and K. Venkatesan. In Example 3.15 on p. 105, the author proved...
Asked on 09/06/2020 by Szeto
2 answerIn my book it is written that$$text{refractive index} = c/v =sqrt{text{permeability} times text{permittivity}}$$ The dielectric constant medium is dependent on the frequency of the field. For example for dc...
Asked on 09/05/2020
2 answerI understand that superconductivity mainly occurs due to the formation of the Cooper pairs in which electrons, instead of repelling...
Asked on 09/05/2020 by Thirsty for concepts
0 answerA phase retarder is generally some birefringent material used to modulate the phase of polarized light. A common example is a half-wave plate, which rotates linearly polarized light symmetrically about...
Asked on 09/05/2020 by Rostislav Grynko
0 answerQuestion: A cylindrical cocktail glass 15cm high and 35cm^2 in cross section contains water up to the 10cm mark. A card is placed over the top and held there while...
Asked on 09/05/2020 by Kaushalesh Upadhyay
0 answerIs a measurement of the current flowing through some material a measurement of the momentum of the electrons? Does their wavefunction collapse to an (approximate?) wavefunction of momentum? ...
Asked on 09/04/2020 by Masterme
1 answerWheeler's delayed choice experiments demonstrate that extracting "which path" information after a particle passes through the slits can seem to retroactively alter its previous behavior at the slits. Quantum eraser...
Asked on 09/04/2020 by Krešimir Bradvica
2 answerRecently there was a result on triviality (or Gaussianity) of the Ising model and $phi^4$-theory in dimension $d=4$. This therefore holds in any dimension $d geq 4$....
Asked on 09/04/2020 by Frederik Ravn Klausen
0 answerSuppose we have the Bose-Hubbard model with $N=2$ particles and $M=4$ sites.We can construct the Hamiltonian in the Fock basis $|urangle =|n_1,n_1,...,n_Mrangle$, where $n_i$ is...
Asked on 09/03/2020 by HELP
1 answerI've heard that the time reparametrization invariance in GR can be thought of as a gauge symmetry. Could someone specifically explain how, while also explaining if there is any connection...
Asked on 09/03/2020
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