# DE equation of state parameter

1. Aug 28, 2009

### Ai52487963

1. The problem statement, all variables and given/known data
Plot $\Delta w$ as a function of spectroscopic redshift for some given biases between spectroscopic and photometric redshifts.

2. Relevant equations
$\Delta w = \frac{\partial D_{A}}{\partial z}\frac{\partial w}{\partial D_{A}} \Delta b$

$D_{A} = \frac{c}{H_0} \cdot \frac{1}{(1+z)} \cdot \frac{1}{\sqrt{\Omega_m (1+z) + \Omega_{\Lambda}}}$

3. The attempt at a solution
I've got the bias curves ready to plug in so I can plot some w stuff here, but I don't know how to relate $$\Omega_{\Lambda}$$ to $$w$$. Can anyone help?

Last edited: Aug 28, 2009