User:Cdahnken

About me:

I am new to Wikipedia, but I came about some articles that need improvement and I think I can contribute.

Articles to work at/prepare contributions:

- Additions to Hubbard Model

-- Analytic solutions possible in 1 and infinite dimensions

-- In 2D and 3D there is no analytic solution. 2D is the relevent case for high-tmeperature superconductivity.

-- Approximate solutions in 2D are for example: Hubbard solution (2nd order Greens function decoupling), Hartree-Fock type mean field solution ...

$$(\omega - \mu) G_{ij,\sigma}= \hbar \delta_{ij} + <<[c_{i,\sigma},H]_- ; c^\dagger_{j,\sigma}>> $$