Calculating eigenvalues and eigenvectors

AI Thread Summary
The discussion revolves around calculating the transition matrix T=UAU^-1 using eigenvalues and eigenvectors. The original transition matrix provided is [0.9 0.002; 0.1 0.998], leading to eigenvalues of 0.898 and 1, resulting in matrix A=[0.898 0; 0 1]. The eigenvectors calculated are V1=[1; -1] and V2=[0.002; 0.1], which, when substituted back, yield the original transition matrix. However, there is confusion regarding the use of different eigenvectors as indicated by a provided inverse matrix, prompting a request for clarification on how to derive the eigenvectors correctly. Understanding the correct eigenvector calculation is essential for resolving the discrepancies in the transition matrix formulation.
James2012
Messages
2
Reaction score
0

Homework Statement


I'm having a problem with a question. I need to find the transition matrix in the form
T=UAU^-1
where U=[V1 V2]

Homework Equations


T=UAU^-1
where U=[V1 V2]

The Attempt at a Solution



my original transition matrix is [0.9 0.002; 0.1 0.998]
from that i calculated the eigenvalues to be 0.898 and 1
which means A=[0.898 0;0 1]
i found the eigenvectors to be V1=[1;-1] and V2=[0.002;0.1]
subbing these into the equation above i end up with the original transition matrix, however the question says to make use of the result [0.02 0.707;0.9998 -0.707]^-1 = [0.9823 0.9823;1.3866 -0.0278]


which means they use different eigenvectors, but I am not sure how they got that
 
Physics news on Phys.org
I also get the same eigenvals as you but the same vectos as them.
 
Hi, How did you get to the eigenvectors?
i used the equation (A-lamdaI)v=0

then for 0.898 i get the follwing

[0.002 0.002;0.1 0.1][V1;V2]=[0;0]
therefore the eigenvector for 0.898 is [1;-1]
 
Thread 'Help with Time-Independent Perturbation Theory "Good" States Proof'
(Disclaimer: this is not a HW question. I am self-studying, and this felt like the type of question I've seen in this forum. If there is somewhere better for me to share this doubt, please let me know and I'll transfer it right away.) I am currently reviewing Chapter 7 of Introduction to QM by Griffiths. I have been stuck for an hour or so trying to understand the last paragraph of this proof (pls check the attached file). It claims that we can express Ψ_{γ}(0) as a linear combination of...
Back
Top