### Author Topic: Problem: Matter power spectrum - Determine the cosmology  (Read 59 times)

#### winther

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##### Problem: Matter power spectrum - Determine the cosmology
« on: 15. April 2021, 13:35:28 »
Below I show a power-spectrum for two models. One with $$\Omega_{M0} = 0.3,\Omega_{\Lambda 0} = 0.7$$ and one with just dark matter and baryons (so no dark energy) $$\Omega_{M0} = 1.0,\Omega_{\Lambda 0} = 0.0$$. What is the key feature we can use to separate them? How does this feature depend on the cosmological parameters? Finally based on this: explain which curve is which cosmology. (Note that you can post answers anonymously by pressing "Attachments and other options below" and check "Post anonymously" if you want)

Below I show a terribly made plot of a power-spectrum for two models which both have a fixed value of $$\Omega_{M0}$$ but where one model has a higher baryons density. Which curve correspond to more baryons and why?
« Last Edit: 15. April 2021, 14:03:18 by winther »