Calculating Probability Density in Quantum Mechanics

  • Context: Graduate 
  • Thread starter Thread starter Tigersharkmks
  • Start date Start date
  • Tags Tags
    Density
Click For Summary

Discussion Overview

The discussion revolves around the calculation of probability density in quantum mechanics, specifically the role of the wave function (ψ) and the inclusion of time in the density calculation. Participants explore theoretical aspects and clarify concepts related to probability density and its interpretation.

Discussion Character

  • Conceptual clarification
  • Debate/contested

Main Points Raised

  • One participant suggests that the probability density should include a time differential (dt), proposing that this approach is more fundamental.
  • Another participant counters that probability density is defined at a given instant and does not incorporate time.
  • A different participant clarifies that the wave function (ψ) itself is not used to calculate probability density; rather, the absolute square of ψ represents the probability density.
  • A further reply emphasizes that the absolute square of the wave function is indeed the probability density, suggesting a correction to the earlier claim.

Areas of Agreement / Disagreement

Participants express differing views on the inclusion of time in the probability density calculation, with no consensus reached on this aspect. There is also clarification on the definition of probability density and the role of the wave function.

Contextual Notes

The discussion does not resolve the implications of including time in the probability density calculation, nor does it clarify the definitions and interpretations of the wave function and probability density in detail.

Tigersharkmks
Messages
4
Reaction score
0
In quantum mechanics, given ψ, we calculate the probability density in a given space by (mod[ψ]^2)*dx*dy*dz (as given in any standard textbook). But my suggetion is that it should be (mod[ψ]^2)*dx*dy*dz*dt where dt is the differential time element. Its seems to me to be more fundamental. Then why don't we do that?
Thanks
Curious undergrad!
 
Physics news on Phys.org
The probability density is at a given instant, not per unit time.
 
Also we do NOT use \Psi to calculate the probability density. \Psi is the probability density. The integral, over a space interval, gives the probability that the object is in that space at the given instant.
 
@HallsofIvy I think you mean the absolute square of the wave function is the probability density.
 

Similar threads

  • · Replies 11 ·
Replies
11
Views
3K
  • · Replies 4 ·
Replies
4
Views
2K
  • · Replies 13 ·
Replies
13
Views
3K
  • · Replies 3 ·
Replies
3
Views
1K
  • · Replies 1 ·
Replies
1
Views
2K
  • · Replies 21 ·
Replies
21
Views
3K
Replies
3
Views
1K
  • · Replies 2 ·
Replies
2
Views
2K
  • · Replies 4 ·
Replies
4
Views
1K
  • · Replies 5 ·
Replies
5
Views
1K