To constrain the nature of Dark Energy and Dark Matter is one of the top themes of modern astrophysics. In this lecture we present a coherent picture of this topic using information carried by radio and X-ray wavelengths. In the first part of the lecture we will cover modern distance determination methods, the structure formation, Compact High-Velocity Clouds, the Warm Hot Intergalactic Medium and the Sunyaev-Zeldovich Effect. In the second part of the lecture we elaborate on the theoretical background of dark matter and dark energy tests, describe several practical approaches with an emphasis on the use of galaxy clusters, and give an overview of relevant current and future instruments.
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You find the student's evaluation of this lecture here.