This course is part of the 2026 Undergraduate Summer School curriculum. This course is an introduction to basic cosmology based on Einstein’s theory of gravity (general relativity), to the modern ΛCDM model of the universe and its limitations, and to dark energy. The last lecture is non-standard and explores a plausible alternative to dark energy based on alternative theories of gravity. You are encouraged to ask questions in class (and outside) at all times.

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