Understanding the Probability Density Function of a Wave Function

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Discussion Overview

The discussion revolves around the probability density function of a wave function in quantum mechanics, specifically how to derive it from a given wave function and its relation to energy. Participants explore the mathematical expressions involved and the implications of their formulations.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested
  • Mathematical reasoning

Main Points Raised

  • Some participants propose that the probability density can be derived from the wave function using the expression \(\mathbb{P} = |\Psi(\vec{r},t)|^2\).
  • One participant expresses interest in understanding the relationship between the probability density \(\mathbb{P}\) and energy, suggesting a potential inverse ratio relationship.
  • Another participant questions the validity of a specific formula presented, asking if it is linked to quantum statistics and expressing unfamiliarity with the formula's origin.
  • There is a claim that the formula presented by one participant is original, leading to a challenge regarding its correctness.
  • Some participants discuss the significance of John von Neumann in the context of quantum mechanics and statistics, with one participant expressing confusion about his contributions.
  • Participants engage in a debate about the understanding of quantum mechanics (QM) and statistical mechanics (SM), with some expressing doubts about the knowledge of others in the discussion.
  • One participant asserts that their formula is correct and invites others to point out any errors, while another participant expresses skepticism about the formula's validity.
  • There is a mention of information theory and its connection to quantum mechanics, with one participant suggesting that misunderstandings arise from a lack of knowledge in this area.

Areas of Agreement / Disagreement

The discussion contains multiple competing views, particularly regarding the validity of the proposed formula and the understanding of quantum mechanics concepts. No consensus is reached on these points.

Contextual Notes

Participants express uncertainty about the definitions and implications of various terms and concepts, indicating a potential gap in foundational knowledge that affects the clarity of the discussion.

Who May Find This Useful

Individuals interested in quantum mechanics, mathematical formulations in physics, and the interplay between information theory and quantum statistics may find this discussion relevant.

thinker
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Have known a wave function, how get does distributing density function of the probability?
 
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You mean,if you have \Psi(\vec{r},t) [/tex],how does one get probablility density...?<br /> Simple:<br /> \mathbb{P}=:|\Psi (\vec{r},t)|^{2}<br /> <br /> Daniel.<br /> <br /> P.S.Or was the question about something else...?<img src="https://cdn.jsdelivr.net/joypixels/assets/8.0/png/unicode/64/1f615.png" class="smilie smilie--emoji" loading="lazy" width="64" height="64" alt=":confused:" title="Confused :confused:" data-smilie="5"data-shortname=":confused:" />
 
thank you, Exactly I want
 
dextercioby said:
You mean,if you have \Psi(\vec{r},t) [/tex],how does one get probablility density...?<br /> Simple:<br /> \mathbb{P}=:|\Psi (\vec{r},t)|^{2}<br /> <br /> Daniel.<br /> <br /> <br /> P.S.Or was the question about something else...?<img src="https://cdn.jsdelivr.net/joypixels/assets/8.0/png/unicode/64/1f615.png" class="smilie smilie--emoji" loading="lazy" width="64" height="64" alt=":confused:" title="Confused :confused:" data-smilie="5"data-shortname=":confused:" />
<br /> <br /> I want to know the relation between \mathbb{P} and energy.<br /> And formula of underneath in:<br /> &lt;br /&gt; \newcommand{\pd}[2]{\mathbb{P}({#1},{#2})}&lt;br /&gt; \mathbb{I}=\idotsint \frac {\pd {\vec{r}} {t}} {\pd {\vec{r}_m} {t_m}} \cdot (1-ln(\frac {\pd {\vec{r}} {t}} {\pd {\vec{r}_m} {t_m}})) \,D \vec{r} \,dt&lt;br /&gt;<br /> <br /> Among them, \mathbb{P}(\vec{r},t) at \vec{r}= {\vec{r}}_m and t= t_m take the biggest value.<br /> <br /> Is the relation between \mathbb{I} and energy the inverse ratio relation?
 
I've never seen your formula...Is it somehow linked to quantum statistics...?In quantum statistics,we don't use Dirac's description of quantum states,but rather von Neumann's...

Please give more details.

Daniel.
 
dextercioby said:
I've never seen your formula...Is it somehow linked to quantum statistics...?In quantum statistics,we don't use Dirac's description of quantum states,but rather von Neumann's...

Please give more details.

Daniel.

I never heard" the von Neumann".May you tell me information for " the von Neumann"?
It is a quantum statistics.That formula useds for measuring the uncertainty.I doubt it to become the inverse ratio with energy.
 
dextercioby,
You are to did not see which formula, because it is what I create.
 
You mean the fluctuation.Fluctuation in what...?That would account for it.What do you mean you created it...?

Did u study QM or SM...?If not,that would explain why u never heard of John von Neumann and why your formula has 99.99% chances of being incorrect.

Daniel.
 
what is QM or SM?
Is John von Neumann who is a mathematician?I don't know this name how to write on my mother tongue.
My formula is correct!
 
  • #10
QM = Quantum Mechanics
SM = I'm guessing Statistical Mechanics
 
  • #11
N_v=\frac {cosv\piJ_v(z)-J_[-v}(z)}{sinv \pi}<br /> Neumann function.<br /> Is he this Neumann?<br /> I am study QM and math and computer
 
  • #12
Nope,that guy is a German.John von Neumann was a Hungary-born American.Mathematician,the one which axiomatized and mathematically founded Quantum Mechanics and Quantum Statistics...

Daniel.
 
  • #13
dextercioby said:
You mean the fluctuation.Fluctuation in what...?That would account for it.What do you mean you created it...?

Did u study QM or SM...?If not,that would explain why u never heard of John von Neumann and why your formula has 99.99% chances of being incorrect.

Daniel.

N_v=\frac {cosv{\pi}J_v(z)-J_{-v}(z)} {sinv \pi}
Neumann function.
Is he this Neumann?
I am study QM and MATH and computer.
D \vec{r}=dx\,dy\,dx in my formula.
I think that my formula is right.You can point out it wrong at where?
hehe..It is what I define.
 
  • #14
I've already told you,that is other Neumann.This quy has nothing to do with QM and QSM...

Daniel.
 
  • #15
dextercioby said:
I've already told you,that is other Neumann.This quy has nothing to do with QM and QSM...

Daniel.
Perhaps I do not have what you study deep, but I am study QM and MATH and computer.
 
  • #16
dextercioby said:
Nope,that guy is a German.John von Neumann was a Hungary-born American.Mathematician,the one which axiomatized and mathematically founded Quantum Mechanics and Quantum Statistics...

Daniel.
I don't knew what you say.I don't read understand.I am sorry.
 
  • #17
dextercioby,
You did not see understand my formula, these are all not strange.Because you do not understand the information theory.It is the outcome that the information theory combines with the quantum mechanics.
 
  • #18
Just curiosity thinker, where are you from and what's your mother tongue?
 
  • #19
BlackBaron said:
Just curiosity thinker, where are you from and what's your mother tongue?
my mother tongue is Chinese.
 

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