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Question 1

-3votes

0answers

95views

Irreversibility of wave function collapse

The equations of classical physics are time reversible -- unchanged when t is replaced by -t. The Schrodinger equation in quantum mechanics is time reversible -- unchanged when t is replaced by -t ...

Maurice Mizrahi

291

asked18 hours ago

Question 2

4votes

6answers

999views

Why is the electron probability density finite at the nucleus despite the Coulomb potential being singular?

In the hydrogen atom, the Coulomb potential$$V(r) = -\frac{e^{2}}{4\pi\varepsilon_0 r}$$$$\psi_{1s}(0)=\frac{1}{\sqrt{\pi a_0^3}}$$This seems contradictory: how can the electron have non-zero ...

ACJ2104

99

askedNov 14 at 19:11

Question 3

1vote

1answer

115views

Can a position dependent mass term in the Klein–Gordon equation cause apparent orbital motion of wave packets?

The Klein–Gordon equation with a position-dependent effective mass,$$\frac{\partial^2 E}{\partial t^2} = c^2 \nabla^2 E - \chi(x)^2 E,$$describes a scalar field whose local propagation speed ...

slaphshot33324

117

askedNov 5 at 23:55

Question 4

2votes

0answers

53views

Is it valid to keep $k_1$ and $k_2$ when considering a light propagating along $z$ axis?

If a mode function of the light is given by $\psi_{\mathbf k}(x^\mu)=ce^{ik_\mu x^\mu}$, where the degrees of freedom of polarization are suppressed, it can be normalized by requiring $\left <\psi_{...

Haorong Wu

125

askedNov 4 at 8:30

Question 5

3votes

2answers

81views

Wrong labels in Eisberg & Resnick $H_2^+$ wavefunctions plot?

I am studying molecules from the book Quantum Physics of Atoms, Molecules, Solids, Nuclei, and Particles by Eisberg & Resnick. Are the labels of the even/odd wavefunctions wrong in Figure 12-2 (...

Andrea P. Zurlo

41

askedOct 20 at 9:01

Question 6

2votes

2answers

113views

Interpretation of a solution in Quantum Mechanics [closed]

I am a Math student and I am following a course in Quantum Mechanics. I am having some trouble understanding the physical solution of some problems. For example, consider the simple problem of a “...

Steppenwolf

267

askedOct 19 at 17:26

Question 7

2votes

1answer

159views

Is there a meaningful way to define an inertia tensor for a wave function?

In classical mechanics the inertia tensor for a density field $\rho(x,y,z)$ inside volume $V$, is defined as:$$\iiint_V \rho(x,y,z)(||{\mathbf r} ||^2 {\mathbf I}_3 - {\mathbf r}\otimes{\mathbf r})...

jeffreygorwinkle

187

askedOct 17 at 9:59

Question 8

-2votes

1answer

138views

Noob questions about wavefunctions [closed]

I am trying to learn a little bit on my own about how we talk about physical systems on a high level of precision, partially because I'm getting into chemistry and want to understand what is ...

Julius Hamilton

113

askedOct 13 at 14:46

Question 9

1vote

4answers

179views

What's the Kinetic energy $T$,Total energy $E$ of a particle in a 1D finite potential well in the regions where the wavefunction becomes exponential?

First off, I am not a physicist, but I have a course on modern physics.In this course, I am getting confused in the QM part. I want to know what the energy of the particle is when potential energy $U=...

Anirudh Metta

21

askedOct 12 at 19:32

Question 10

2votes

0answers

87views

Confusion in the implications of Bloch's Theorem [duplicate]

I am a beginner in condensed matter physics and I am reading Bloch's Theorem from a book by Ashcroft & Mermin. It is saying thatbecause the set of all wave functions and energy levels for two ...

Nikhil Negi

172

askedOct 11 at 13:50

Question 11

4votes

1answer

408views

Why our current frontier theory in quantum mechanics (QFT) using field?

Is there any theoretical aspects or experimental result or other reasons that lead to using “field”?I think the Schrödinger equation works well to describe particle. Then even if we want to include ...

user222803

askedOct 11 at 9:42

Question 12

0votes

0answers

59views

Reference request: Byers-Yang theorem

Recently I have become interested in learning more about Byers-Yang theorem, however I haven't been able to find many references where it is discussed in detail, other than the original 1961 paper. I'...

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madame picard

Question 13

1vote

0answers

84views

Treatment of the WKB method in "An Introduction to Quantum Mechanics", 3rd edition by David J. Griffiths and Darrell F. Schroeter

In the third edition of the book "An Introduction to Quantum Mechanics" by David J. Griffiths and Darrell F. Schroeter the so called Wentzel-Kramers-Brillouin (WKB) method is treated in ...

Physics_Et_Al

723

askedOct 3 at 13:07

Question 14

2votes

2answers

168views

Trying to understand Pauli Exclusion Principle (Griffiths)

I'm trying to learn physics on my own but I am a bit stuck on the identical particles unit in the Griffiths textbook, specifically trying to derive how the Pauli exclusion principle happens.From the ...

Serg Serg

29

askedSep 30 at 15:07

Question 15

2votes

0answers

163views

Rigorous proof of jump condition for first derivative of solution of 1d TISE

Let $V$ be a potential that has a singularity at $0$, i.e. $V(0)=\infty$. Example: Delta potential $V(x)=\lambda \delta(x)$. In textbooks it's stated that the first derivative of the solution $\psi$ ...

tj_

121

askedSep 22 at 5:30

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Stack Exchange Network

Questions tagged [wavefunction]

Irreversibility of wave function collapse

Why is the electron probability density finite at the nucleus despite the Coulomb potential being singular?

Can a position dependent mass term in the Klein–Gordon equation cause apparent orbital motion of wave packets?

Is it valid to keep $k_1$ and $k_2$ when considering a light propagating along $z$ axis?

Wrong labels in Eisberg & Resnick $H_2^+$ wavefunctions plot?

Interpretation of a solution in Quantum Mechanics [closed]

Is there a meaningful way to define an inertia tensor for a wave function?

Noob questions about wavefunctions [closed]

What's the Kinetic energy $T$,Total energy $E$ of a particle in a 1D finite potential well in the regions where the wavefunction becomes exponential?

Confusion in the implications of Bloch's Theorem [duplicate]

Why our current frontier theory in quantum mechanics (QFT) using field?

Reference request: Byers-Yang theorem

Treatment of the WKB method in "An Introduction to Quantum Mechanics", 3rd edition by David J. Griffiths and Darrell F. Schroeter

Trying to understand Pauli Exclusion Principle (Griffiths)

Rigorous proof of jump condition for first derivative of solution of 1d TISE

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