Active Galactic Nuclei (AGN) play a role in cosmology as both component and probe.
They are used to contrain cosmological parameters, to characterize the intergalactic medium, and as a .
AGN interact with their host galaxies, influencing its evolution through a process called AGN feedback.
Modeling AGN feedback presents significant challenges, but has improved upon the \LCDM model as tested by the Millenium Simulation. \cite{2005Natur.435..629S}
\end{abstract}
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\section{Introduction}
\label{sec:intro}
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\section{Cosmology}
\label{sec:cosmology}
\subsection{Millenium Simulation}
The Millenium Simulation tests the \LCDM cosmology