Gaussian wavepacket as a solution of the Schrödinger equation

JorgeM
Messages
30
Reaction score
6
Homework Statement
Hello everyone.
I need to find out that the gaussian wavepacket is a solution of the Schrödinger equation.
I first tought that It would be so much easier just to calculate the derivatives and to probe that gaussian equation satisfies Schrodinger's equation but it did not result easy at all.
Do you know any book or place where to find this in the simplest way possible (even the demonstration and not just the probe)
I'm relatively new in studying quantum mechanics so many concepts are new to me.
Relevant Equations
Schrodinger's equation
The Schrödinger equation I need to prove is this one
imagen1.jpg


And the Gaussian wavepacket is found here
imagen2.jpg

Thanks for your advice.

JorgeM

<Moderator's note: upload images to PhysicsForums. Do not use external image servers.>
 
Last edited by a moderator:
Physics news on Phys.org
See:
Introduction to Quantum Mechanics, D.J Griffiths
Quantum Mechanics, N. Zettili
 
JorgeM said:
Homework Statement:: Hello everyone.
I need to find out that the gaussian wavepacket is a solution of the Schrödinger equation.
I first tought that It would be so much easier just to calculate the derivatives and to probe that gaussian equation satisfies Schrodinger's equation but it did not result easy at all.
Do you know any book or place where to find this in the simplest way possible (even the demonstration and not just the probe)
I'm relatively new in studying quantum mechanics so many concepts are new to me.
Relevant Equations:: Schrodinger's equation

The Schrödinger equation I need to prove is this one

https://ibb.co/6WMSBH2And the Gaussian wavepacket is found here

https://ibb.co/4RTDRm1Thanks for your advise.

JorgeM

The advice is simple: differentiate!

There is nothing else to do.

PS Welcome to quantum mechanics! :smile:
 
Last edited:
  • Like
Likes vanhees71
JorgeM said:
I first tought that It would be so much easier just to calculate the derivatives and to probe that gaussian equation satisfies Schrodinger's equation but it did not result easy at all.
If you show us your work, someone here can probably find where you went wrong.

I strongly suggest that you try to use LaTeX rather than try to post images of your handwritten algebra, because the helpers here find it much easier to read and work with. With LaTeX, people can "quote" indvidual equations or sections of equations in order to highlight errors, which is much more difficult when they're part of an image.

https://www.physicsforums.com/help/latexhelp/

The Gaussian wave packet is one of the more complicated wave functions that you find in an introductory textbook. Have you successfully verified simpler wave functions as solutions to the Schrödinger equation?
 
Thread 'Need help understanding this figure on energy levels'
This figure is from "Introduction to Quantum Mechanics" by Griffiths (3rd edition). It is available to download. It is from page 142. I am hoping the usual people on this site will give me a hand understanding what is going on in the figure. After the equation (4.50) it says "It is customary to introduce the principal quantum number, ##n##, which simply orders the allowed energies, starting with 1 for the ground state. (see the figure)" I still don't understand the figure :( Here is...
Thread 'Understanding how to "tack on" the time wiggle factor'
The last problem I posted on QM made it into advanced homework help, that is why I am putting it here. I am sorry for any hassle imposed on the moderators by myself. Part (a) is quite easy. We get $$\sigma_1 = 2\lambda, \mathbf{v}_1 = \begin{pmatrix} 0 \\ 0 \\ 1 \end{pmatrix} \sigma_2 = \lambda, \mathbf{v}_2 = \begin{pmatrix} 1/\sqrt{2} \\ 1/\sqrt{2} \\ 0 \end{pmatrix} \sigma_3 = -\lambda, \mathbf{v}_3 = \begin{pmatrix} 1/\sqrt{2} \\ -1/\sqrt{2} \\ 0 \end{pmatrix} $$ There are two ways...
Back
Top