1. Overview 2. Expansion history of the universe 3. Correlation function and power spectrum 4. Basics of cosmological perturbation theory 5. Observational evidence of dark energy 6. Cosmological constant 7. Dark energy as a modified form of matter I: quintessence 8. Dark energy as a modified form of matter II 9. Dark energy as a modification of gravity 10. Cosmic acceleration without dark energy 11. Dark energy and linear cosmological perturbations 12. Non-linear cosmological perturbations 13. Statistical methods in cosmology 14. Future observational constraints on the nature of dark energy 15. Conclusion and outlook 16. Answers to the problems 17. Mathematical appendix Index.
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