Abstract: Presentation slides prepared for a series of eight lectures on gravitational waves (GWs) from the early Universe given at the 46th Heidelberg Physics Graduate Days (April 6-9, 2021). This lecture series is aimed at physics graduate students with rudimentary background knowledge of general relativity and cosmology and covers the following topics: Lecture 1A: Definition and properties of GWs in general relativity (GWs in linearized gravity, propagation in the expanding Universe, stochastic GW backgrounds in cosmology) Lecture 1B: An overview of e...
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