Energy from schrödinger equation

Click For Summary
SUMMARY

The discussion centers on the mathematical manipulation of the Schrödinger equation, specifically the transition from the expression involving the Laplacian operator to the integral form of the kinetic energy term. The key step involves using integration by parts to transfer the derivative operator from the wave function on the right to the wave function on the left. This technique is essential for deriving the relationship between the kinetic energy and the wave function in quantum mechanics.

PREREQUISITES
  • Understanding of quantum mechanics and the Schrödinger equation
  • Familiarity with partial differential equations
  • Knowledge of integration by parts in calculus
  • Basic concepts of functional analysis and inner product spaces
NEXT STEPS
  • Study the derivation of the time-independent Schrödinger equation
  • Learn about integration by parts in the context of functional analysis
  • Explore the implications of the Laplacian operator in quantum mechanics
  • Investigate the physical interpretation of wave functions in quantum systems
USEFUL FOR

Students and professionals in physics, particularly those focusing on quantum mechanics, as well as mathematicians interested in the application of calculus in physics.

Gavroy
Messages
232
Reaction score
0
hi

i was currently thinking about this step here:

[itex]\langle \psi_n, - \Delta \psi_n \rangle = \int |\nabla \psi_n|^2 dx[/itex]

how do you get from the laplacian to this other expression?
 
Physics news on Phys.org
Integrate by parts to move a del operator from the right psi to the left one.
 

Similar threads

  • · Replies 13 ·
Replies
13
Views
4K
  • · Replies 2 ·
Replies
2
Views
2K
  • · Replies 8 ·
Replies
8
Views
10K
  • · Replies 41 ·
2
Replies
41
Views
11K
  • · Replies 4 ·
Replies
4
Views
3K
  • · Replies 15 ·
Replies
15
Views
3K
  • · Replies 17 ·
Replies
17
Views
3K
  • · Replies 11 ·
Replies
11
Views
2K
  • · Replies 29 ·
Replies
29
Views
3K
  • · Replies 5 ·
Replies
5
Views
2K