- #1
dman12
- 13
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Homework Statement
Hi. I am trying to solve a problem on renormalisation group flow and have come across the following coupled equations that I need to solve:
Λ ∂g/∂Λ = b.m
Λ ∂m/∂Λ = -2.m + a.g
Where a and b are just constants. I need to find g(Λ) and m(Λ).
Homework Equations
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I thought this could perhaps be solved by turning it into a matrix equation and then diagonalising and expressing g(Λ) and m(Λ) as sums of eigenvectors.
3. The Attempt at a Solution
First I found the eigenvalues of the matrix to give:
λ+ = -1 + √(1+ab)
λ- = -1 - √(1+ab)
And then I found the eigenvectors of the operator Λ ∂/∂Λ :
ν+(Λ) = (Λ/μ)λ+ ν+(μ)
Where μ is just some integration constant. A similar expression holds for ν-
I then decomposed:
g(Λ) = α ν+ + β ν-
m(Λ) = γ ν+ + δ ν-
But I don't really know where to go from here? Any help would be greatly appreciated!